19-2532; Rev 5; 12/07 KIT ATION EVALU LE B A IL A AV 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Features The MAX6469-MAX6484 are low-dropout linear regulators with a fully integrated microprocessor reset circuit. Each is available with preset output voltages from +1.5V to +3.3V in 100mV increments and delivers up to 300mA of load current. These devices consume only 82A of supply current. The low supply current, low dropout voltage, and integrated reset functionality make these devices ideal for battery-powered portable equipment. 3 3 UCSP, 6-Pin SOT23, and 8-Pin TDFN Packages The MAX6469-MAX6484 include a reset output that indicates when the regulator output drops below standard microprocessor supply tolerances (-7.5% or -12.5% of nominal output voltage). This eliminates the need for an external microprocessor supervisor, while ensuring that supply voltages and clock oscillators have stabilized before processor activity is enabled. Push-pull and opendrain active-low reset outputs are available, with reset timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min). Guaranteed 300mA Output Current The MAX6469/MAX6470/MAX6473-MAX6478/MAX6481- MAX6484 also have a shutdown feature that reduces the supply current to 0.1A (typ). The MAX6471-MAX6474/ MAX6479-MAX6482 offer a manual reset input to assert a microprocessor reset while the regulator output is within specification. The MAX6475/MAX6476/MAX6483/ MAX6484 feature a remote feedback sense pin for use with an external NPN transistor for higher-current applications. The MAX6469-MAX6476 are available in 6-pin SOT23 and 8-pin TDFN packages. The MAX6477- MAX6484 are available in a 3 x 3 chip-scale package (UCSPTM). All devices are specified for operation from -40C to +85C. Push-Pull or Open-Drain RESET Applications Handheld Instruments (PDAs, Palmtops) PCMCIA Cards/USB Devices Cellular/Cordless Telephones CD/DVD Drives Notebook Computers Digital Cameras Bluetooth Modules/Wireless LAN UCSP is a trademark of Maxim Integrated Products, Inc. Pin Configurations appear at end of data sheet. Preset +1.5V to +3.3V Output (100mV Increments) SET Pin for Adjustable Output Voltage 75VRMS LDO Output Voltage Noise (MAX6477-MAX6484) 2.0% Accuracy Over Temperature Low Dropout Voltage 55mV at 150mA 114mV at 300mA 82A Supply Current, 0.1A Shutdown Current Input Reverse Current, Thermal and Short-Circuit Protection Microprocessor Reset with Four Timeout Options Manual Reset Input Remote Feedback Sense Ordering Information PART TEMP RANGE PINPACKAGE MAX6469UT_ _ _D_-T -40C to +85C 6 SOT23-6 MAX6469TA_ _ _D_-T* -40C to +85C 8 TDFN-8 MAX6470UT_ _ _D_-T -40C to +85C 6 SOT23-6 MAX6470TA_ _ _D_-T* -40C to +85C 8 TDFN-8 *Future product--contact factory for availability. Note: The first "_ _"are placeholders for the output voltage levels of the devices. Desired output voltages are set by the suffix found in the Output Voltage Suffix Guide (Table 1). The third "_" is a placeholder for the reset threshold accuracy. Desired reset threshold accuracy is set by the suffix found in the Reset Threshold Accuracy Guide (Table 2). The "_" following the D is a placeholder for the reset timeout delay time. Desired reset timeout delay time is set by the suffix found in the Reset Timeout Delay Guide (Table 3). For example, the MAX6481BL30BD4-T has a 3.0V output voltage, 12.5% reset threshold tolerance, and a 1200ms (min) reset timeout delay. Sample stock is generally available on standard versions only (Table 4). Standard versions require a minimum order increment of 2.5k units. Nonstandard versions must be ordered in 10k-unit increments. Contact factory for availability. Ordering Information continued at end of data sheet. Typical Operating Circuits appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX6469-MAX6484 General Description MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) IN, SHDN, OUT, FB ..................................................-0.3V to +7V MR, SET .......................................................-0.3V to (VIN + 0.3V) RESET (push-pull) ...................................-0.3V to (VOUT + 0.3V) RESET (open drain)..................................................-0.3V to +7V OUT Short Circuit .......................................................Continuous Input/Output Current (all pins except IN and OUT) ............20mA Continuous Power Dissipation (TA = +70C) 3 x 3 UCSP (derate 10.5mW/C above +70C) ............840mW 6-Pin SOT23 (derate 9.1mW/C above +70C).............727mW 8-Pin TDFN (derate 24.4mW/C above +70C) ..........1951mW Operating Temperature Range ..........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Bump Reflow Temperature (Note 1) ................................+235C Note 1: The MAX6477-MAX6484 are constructed using a unique set of packaging techniques that impose a limit on the thermal profile the devices can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection reflow. Pre-heating is required. Hand or wave soldering is not allowed. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VIN = (VOUT + 0.5V) or +2.5V, whichever is greater, COUT = 3.3F, TA = -40C to +85C. Typical specifications are at TA = +25C, unless otherwise noted.) (Note 2) PARAMETER Input Voltage Range Input Undervoltage Lockout Supply Current (Ground Current) Shutdown Supply Current SYMBOL CONDITIONS VIN VUVLO IQ ISHDN VIN falling IOUT = 0 IOUT = 300mA Output Voltage Accuracy (Fixed Output Voltage Operation, Table 1) MAX6477-MAX6484 Adjustable Output Voltage Range SET Reference Voltage SET Dual ModeTM Threshold SET Input Leakage Current 82 96 0.1 UNITS 5.5 2.47 136 V V 1 300 -1.3 -2.3 +1.3 +2.3 1mA IOUT 300mA, TA = -40C to +85C -2.7 +2.7 2mA IOUT 100mA, TA = +25C -1.1 +1.1 2mA IOUT 100mA, TA = -40C to +85C -2.0 +2.0 2mA IOUT 300mA, TA = -40C to +85C (Note 3) -2.5 +2.5 VSET 1.200 VSET = 0, +1.2V (Note 3) A A mA 1.229 185 20 Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 MAX 1mA IOUT 150mA, TA = +25C 1mA IOUT 150mA, TA = -40C to +85C VSET ISET TYP 2.5 2.25 TA = +25C REGULATOR CIRCUIT Output Current Output Voltage Accuracy (Fixed Output Voltage Operation, Table 1) MAX6469-MAX6476 MIN _______________________________________________________________________________________ 5.0 1.258 100 % % V V mV nA 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit (VIN = (VOUT + 0.5V) or +2.5V, whichever is greater, COUT = 3.3F, TA = -40C to +85C. Typical specifications are at TA = +25C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS VOUT = +3.3V (fixed output operation) VOUT = +3.0V (fixed output operation) Dropout Voltage (Notes 3, 4) VDO VOUT = +2.8V (fixed output operation) VOUT = +2.5V (fixed output operation) Output Current Limit VIN 2.5V (Note 3) Input Reverse Leakage Current (OUT to IN Leakage Current) VIN = 4V, VOUT = 5.5V, SHDN deasserted Startup Time Response Rising edge of VIN or SHDN to VOUT within specification, RL = 68, SET = GND, IOUT = 10mA SHDN Input Low Voltage VIL SHDN Input High Voltage VIH SHDN Input Current Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis MIN IOUT = 50mA IOUT = 150mA IOUT = 300mA IOUT = 50mA IOUT = 150mA IOUT = 300mA IOUT = 50mA IOUT = 150mA IOUT = 300mA IOUT = 50mA IOUT = 150mA IOUT = 300mA TYP MAX UNITS 23 55 114 25 61 114 26 65 137 30 75 158 32 90 180 40 100 190 50 110 210 60 150 250 mV 450 mA 0.01 1.5 20 s 0.3 x VIN 0.7 x VIN SHDN = VIN or GND -1 A V V 0.1 +1 A TSHDN 180 C TSHDN 20 C Line Regulation VOUT = 1.5V, 2.5V VIN 5.5V, IOUT = 10mA 0.09 %/V Load Regulation VOUT = 1.5V, VIN = 2.5V, 1mA IOUT 150mA 0.2 % Output Voltage Noise 10Hz to 100kHz, CIN = 0.1F, IOUT = 100mA, VOUT = 1.5V MAX6469-MAX6476 150 MAX6477-MAX6484 75 VRMS RESET CIRCUIT VOUT Reset Threshold (VFB for MAX6475/MAX6476/ MAX6483/MAX6484) (Note 5) VTHOUT MAX64_ _ _ _ _ _ A 90 92.5 95 MAX64_ _ _ _ _ _ B 85 87.5 90 VOUT to Reset Delay (VFB for MAX6475/MAX6476/ MAX6483/MAX6484) Reset Timeout Period (Note 6) 35 tRP %VOUT s D1 2.5 3.75 5.0 D2 20 30 40 D3 150 225 300 D4 1200 1800 2400 ms _______________________________________________________________________________________ 3 MAX6469-MAX6484 ELECTRICAL CHARACTERISTICS (continued) ELECTRICAL CHARACTERISTICS (continued) (VIN = (VOUT + 0.5V) or +2.5V, whichever is greater, COUT = 3.3F, TA = -40C to +85C. Typical specifications are at TA = +25C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL MR Input Low Voltage VIL MR Input High Voltage VIH CONDITIONS MIN (Note 3) TYP s 120 200 RESET Output Voltage (Open Drain) VOL Open-Drain Reset Output Leakage Current ILKG 25 ns ns 40 70 VOUT 1.0V, ISINK = 50A, RESET asserted 0.3 VOUT 1.5V, ISINK = 3.2mA, RESET asserted 0.4 (Note 3) VOL RESET Output Voltage Push-Pull 1 VOUT 1.0V, ISINK = 50A, RESET asserted 0.3 VOUT 1.5V, ISINK = 3.2mA, RESET asserted 0.4 VOUT 2.0V, ISOURCE = 500A, RESET deasserted VOH Note 2: Note 3: Note 4: Note 5: Note 6: V 1 MR to Reset Delay MR to OUT UNITS 0.3 x VOUT V MR Glitch Rejection MR Pullup Resistance MAX 0.7 x VOUT MR Minimum Input Pulse k V A 0.8 x VOUT V All devices are 100% production tested at +25C and are guaranteed by correlation for TA = TMIN to TMAX. Guaranteed by design. Dropout voltage is defined as (VIN - VOUT) when VOUT is 2% below the value of VOUT for VIN = VOUT(NOM) + 1V. MAX6473/MAX6474/MAX6481/MAX6482 are guaranteed by design for VOUT < 2.5V. Select the reset timeout period using the Reset Timeout Delay Guide (Table 3). Insert the appropriate suffix in the part number when ordering. Typical Operating Characteristics (VIN = 5V, VOUT = 3.3V, COUT = 3.3F, TA = +25C, unless otherwise noted.) 60 40 20 1 2 3 4 INPUT VOLTAGE (V) 5 6 150 MAX6469 toc02 80 60 +25C -40C 40 125 RESET ASSERTS ABOVE THIS LINE 100 75 50 25 0 0 4 +85C 20 0 MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE PULSE DURATION (s) -40C 80 100 GROUND CURRENT (A) +85C +25C 100 120 MAX6469 toc01 120 GROUND CURRENT vs. INPUT VOLTAGE (300mA LOAD) MAX6469 toc03 GROUND CURRENT vs. INPUT VOLTAGE (NO LOAD) GROUND CURRENT (A) MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit 0 0 1 2 3 4 INPUT VOLTAGE (V) 5 6 1 10 RESET THRESHOLD OVERDRIVE (mV) _______________________________________________________________________________________ 100 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit VOUT = 3.3V COUT = 3.3F ILOAD = 30mA -10 PSRR (dB) 50 4 COUT ESR () -20 75 -30 MAX6469 toc06 100 5 MAX6469 toc05 VOUT = 3.3V COUT = 3.3F 3 COUT = 4.7F 2 COUT = 3.3F -40 25 1 -50 STABLE REGION 0 -60 0 50 100 150 200 250 0.01 300 0.1 OUTPUT NOISE MAX6469 toc07 100 1000 0 50 100 150 200 250 LOAD CURRENT (mA) OUTPUT NOISE vs. FREQUENCY SHUTDOWN RESPONSE VIN = 2.5V VOUT = 1.5V IOUT = 100mA 80 100V/div 10 300 MAX6469 toc09 100 VIN = 4.5V VOUT = 3.3V ILOAD = 100mA 1 FREQUENCY (kHz) LOAD CURRENT (mA) MAX6469 toc08 0 VRMS (V) DROPOUT VOLTAGE (mV) 0 MAX6469 toc04 125 REGION OF STABLE COUT ESR vs. LOAD CURRENT PSRR vs. FREQUENCY DROPOUT VOLTAGE vs. LOAD CURRENT MAX6469-MAX6484 Typical Operating Characteristics (continued) (VIN = 5V, VOUT = 3.3V, COUT = 3.3F, TA = +25C, unless otherwise noted.) VSHDN 5V/div 60 40 VOUT 2V/div 20 ILOAD = 50mA 0 500s/div 10 100 1k 10k 100k 20ms/div FREQUENCY (Hz) STARTUP RESPONSE MAX6469 toc10 MAX6469 toc12 MAX6469 toc11 VIN 2V/div VIN = 5V VOUT = 3.3V ILOAD = 100mA VIN = 5V VOUT = 3.3V ILOAD = 10mA TO 300mA VOUT 5mV/div VOUT 20mV/div VOUT 2V/div 10s/div LOAD-TRANSIENT RESPONSE NEAR DROPOUT LOAD-TRANSIENT RESPONSE 100s/div 10s/div _______________________________________________________________________________________ 5 Typical Operating Characteristics (continued) (VIN = 5V, VOUT = 3.3V, COUT = 3.3F, TA = +25C, unless otherwise noted.) RESET DELAY RESPONSE LINE-TRANSIENT RESPONSE RESET RESPONSE TO MR MAX6469 toc14 MAX6469 toc13 5V 4.5V MAX6469 toc15 VIN 500mV/div VIN 1V TO 4V 2V/div MR 2V/div RESET 2V/div RESET 2V/div VOUT 20mV/div AC-COUPLED VOUT = 3.3V ILOAD = 10mA 200ms/div 100s/div 200ns/div MAX6469 toc16 1.012 RESET 2V/div VOUT 2V/div VIN 5V/div MAX6469 toc17 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE RESET RESPONSE TO VIN RISING NORMALIZED OUTPUT VOLTAGE MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit NORMALIZED TO +25C 1.006 ILOAD = 10mA 1.000 0.994 ILOAD = 150mA ILOAD = 300mA 0.988 200ms/div -40 -15 10 35 60 TEMPERATURE (C) 6 _______________________________________________________________________________________ 85 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit PIN BUMP MAX6469/MAX6470 MAX6477/MAX6478 NAME FUNCTION SOT23 TDFN UCSP 1 1, 2 A1 IN 2 3 A2 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit-board ground plane to maximize thermal dissipation. 3 4 A3 SHDN Active-Low Shutdown Input. Connect SHDN to VIN for normal operation. Regulator Input. Bypass IN to GND with a 0.1F capacitor. 4 5 C3 RESET Active-Low Reset Output. RESET remains low while VOUT is below the reset threshold. RESET remains low for the duration of the reset timeout period after the reset conditions are terminated. RESET is available in open-drain and push-pull configurations. 5 6 C2 SET Feedback Input for Externally Setting the Output Voltage. Connect SET to GND to select the preset output voltage. Connect SET to an external resistor-divider network for adjustable output operation. 6 7, 8 C1 OUT Regulator Output. Bypass OUT to GND with a minimum 3.3F low-ESR capacitor. -- EP -- -- Exposed Paddle. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal-resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. MAX6471/MAX6472/MAX6479/MAX6480 Pin Description PIN BUMP MAX6475/MAX6476 MAX6483/MAX6484 SOT23 TDFN UCSP 1 1, 2 A1 NAME IN FUNCTION Regulator Input. Bypass IN to GND with a 0.1F capacitor. 2 3 A2 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit-board ground plane to maximize thermal dissipation. 3 4 A3 SHDN Active-Low Shutdown Input. Connect SHDN to VIN for normal operation. 4 5 C3 RESET Active-Low Reset Output. RESET remains low while FB is below the reset threshold. RESET remains low for the duration of the reset timeout period after the reset conditions are terminated. RESET is available in open-drain and push-pull configurations. 5 6 C2 FB Feedback Input for Linear Regulator Controller or Remote Sense Applications. Connect FB to the external load (VCC) to obtain the fixed output voltage. 6 7, 8 C1 OUT Regulator Output. Bypass OUT to GND with a minimum 3.3F low-ESR capacitor. -- EP -- -- Exposed Paddle. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal-resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. _______________________________________________________________________________________ 7 MAX6469-MAX6484 MAX6469/MAX6470/MAX6477/MAX6478 Pin Description 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit MAX6469-MAX6484 MAX6473/MAX6474/MAX6481/MAX6482 Pin Description PIN BUMP MAX6473/MAX6474 MAX6481/MAX6482 NAME FUNCTION SOT23 TDFN UCSP 1 1, 2 A1 IN 2 3 A2 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit-board ground plane to maximize thermal dissipation. 3 4 A3 SHDN Active-Low Shutdown Input. Connect SHDN to VIN for normal operation. RESET Active-Low Reset Output. RESET remains low while VOUT is below the reset threshold or while MR is held low. RESET remains low for the duration of the reset timeout period after the reset conditions are terminated. RESET is available in open-drain and push-pull configurations. Active-Low Manual Reset Input. The reset output is asserted while MR is pulled low and remains asserted for the duration of the reset timeout period after MR transitions from low to high. Leave MR unconnected or connect to VOUT if not used. MR has an internal pullup resistor of 40k (typ) to VOUT. 4 5 C3 5 6 C2 MR 6 7, 8 C1 OUT -- EP -- -- Regulator Input. Bypass IN to GND with a 0.1F capacitor. Regulator Output. Bypass OUT to GND with a minimum 3.3F (min) low-ESR capacitor. Exposed Paddle. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal-resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. MAX6475/MAX6476/MAX6483/MAX6484 Pin Description 8 PIN BUMP MAX6475/MAX6476 MAX6483/MAX6484 NAME FUNCTION SOT23 TDFN UCSP 1 1, 2 A1 IN 2 3 A2 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit-board ground plane to maximize thermal dissipation. 3 4 A3 SHDN Active-Low Shutdown Input. Connect SHDN to VIN for normal operation. Regulator Input. Bypass IN to GND with a 0.1F capacitor. 4 5 C3 RESET Active-Low Reset Output. RESET remains low while FB is below the reset threshold. RESET remains low for the duration of the reset timeout period after the reset conditions are terminated. RESET is available in open-drain and push-pull configurations. 5 6 C2 FB Feedback Input for Linear Regulator Controller or Remote Sense Applications. Connect FB to the external load (VCC) to obtain the fixed output voltage. 6 7, 8 C1 OUT Regulator Output. Bypass OUT to GND with a minimum 3.3F low-ESR capacitor. -- EP -- -- Exposed Paddle. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal-resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. _______________________________________________________________________________________ 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit The MAX6469-MAX6484 are ultra-low, quiescent current, low-dropout linear regulators with an integrated microprocessor reset circuit. These devices guarantee 300mA (min) drive capabilities and are available with preset output voltages in 100mV increments between +1.5V and +3.3V. The internal reset circuit monitors the regulator output voltage and asserts the reset output when the regulator output is below the microprocessor supply tolerance. 2.5V TO 5.5V IN OUT MAX6469-MAX6472 MAX6477-MAX6480 SET (MR) MANUAL RESET R1 COUT GND R2 Regulator The regulator core operates with +2.5V to +5.5V input voltage range. The output voltage is offered in 100mV increments between +1.5V and +3.3V (contact factory for other output voltage options). The MAX6469- MAX6472/MAX6477-MAX6480 offer an adjustable output voltage implemented with an external resistordivider network between OUT, SET, and GND (Figure 1). SET must be connected to either GND for fixed VOUT or to an external divider for adjustable VOUT. The MAX6469-MAX6472/MAX6477-MAX6480 automatically determine the feedback path depending on the connection of SET. The Typical Operating Circuit shows a typical connection for the MAX6469. OUT is an internally regulated low-dropout (LDO) linear regulator that powers a microprocessor. Reset Circuit The reset supervisor circuit is fully integrated in the MAX6469-MAX6484 and uses the same reference voltage as the regulator. Two supply tolerance reset thresholds, -7.5% and -12.5%, are provided for each type of device. -7.5% Reset: Reset does not assert until the regulator output voltage is at least -5% out of tolerance and always asserts before the regulator output voltage is -10% out of tolerance. -12.5% Reset: Reset does not assert until the regulator output voltage is at least -10% out of tolerance and always asserts before the regulator output voltage is -15% out of tolerance. RESET Output A P's reset input starts the P in a known state. The MAX6469-MAX6484 P supervisory circuits assert RESET during power-up, power-down, and brownout conditions. RESET asserts when the input voltage is below the undervoltage lockout threshold. RESET asserts when VOUT is below the reset threshold and remains asserted for at least the minimum selected reset timeout period (tRP, Table 3) after VIN rises above the undervoltage lockout threshold and VOUT rises above ( ) ARE FOR MAX6471/MAX6472/MAX6479/MAX6480 ONLY Figure 1. Adjustable Output Voltage Configuration the reset threshold. RESET asserts when MR is pulled low (MAX6471-MAX6474/MAX6479-MAX6482). RESET asserts when SHDN is pulled low (MAX6469/ MAX6470/MAX6473-MAX6478/MAX6481-MAX6484). Shutdown (MAX6469/MAX6470/MAX6473-MAX6478/MAX6481- MAX6484 only) SHDN allows the regulator to shut down, thereby reducing the total IIN consumption of the device. SHDN provides a digitally controlled active-low shutdown. In shutdown mode, the pass transistor, control circuit, and reference turn off to reduce the supply current to below 0.1A. Connect SHDN to IN for normal operation. Manual Reset Input (MAX6471-MAX6474/MAX6479-MAX6482 only) Many P-based products require manual reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset while the regulator output voltage is still within tolerance. Reset remains asserted while MR is low and for the reset timeout period (tRP) after MR returns high. The MR input has an internal pullup of 40k (typ) to OUT. MR can be driven with TTL/CMOS logic levels or with open-drain/collector outputs. Connect a normally open switch from MR to GND to create a manual reset function; external debounce circuitry is not required. If MR is driven from long cables or the device is used in a noisy environment, connect a 0.1F capacitor from MR to GND to provide additional noise immunity. Feedback Input (MAX6475/MAX6476/MAX6483/MAX6484 only) The feedback input (FB) connects to an internal resistordivider network (Functional Diagram). FB is not internally connected to VOUT, and as a result can be used to _______________________________________________________________________________________ 9 MAX6469-MAX6484 Detailed Description MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit remotely sense the output voltage of the device. Using FB with an external npn transistor, the current drive capability can be increased according to the following equation (Figure 2): IOUT(TOTAL) = IOUT (+1) The external npn pass transistor must meet specifications for current gain, power dissipation, and collector current. The beta influences the maximum output current the circuit can deliver. The largest guaranteed output current is given by ILOAD (max) = 300mA x beta (min). The transistor's rated power dissipation must exceed the actual power dissipated in the transistor. The power dissipated (PD) equals the maximum load current (ILOAD (max)) times the maximum input-to-output voltage differential: PD = ILOAD (max) x (VIN (max) V OUT ). The rated transistor collector current must exceed the maximum load current. Reverse Leakage Protection Reverse OUT to IN Current An internal circuit monitors the MAX6469-MAX6484 input and output voltages. When the output voltage is greater than the input voltage, the internal IN-to-OUT pass transistor and parasitic diode turn off. An external voltage applied to OUT does not reverse charge a battery or power source applied to IN (the leakage path from OUT to IN is 0.01A typ). When the output voltage exceeds the input voltage, OUT powers the device and shutdown must be logic high (greater than 0.7 VOUT). RESET asserts until IN exceeds OUT and OUT is above the specified VTHOUT threshold (based on the selected or adjusted regulator OUT nominal voltage). OUT-to-GND current through the LDO is 40A (typ). The regulator output can be held up with an external super capacitor or backup battery at OUT until the IN battery is replaced. The RESET output is asserted while the IN battery is removed to place the system in a low-power mode. Volatile memory content is maintained until the super capacitor or battery voltage drops below RAM standby specifications. RESET deasserts when the IN battery has been replaced and OUT exceeds the desired reset threshold. For nonrechargeable backup battery applications, place a reverse diode between OUT and the backup battery (to prevent battery charging). The external diode does not affect the regulator's dropout voltage because it is not between the LDO output and the processor/memory VCC supply. The diode can be replaced with a current-limiting resistor for rechargeable backup battery applications. Current Limit The MAX6469-MAX6484 include an internal currentlimit circuit that monitors and controls the pass transistor's gate voltage, limiting the output current to 450mA (min). The output can be shorted to ground indefinitely without damaging the part. Thermal Shutdown When the junction temperature (TJ) exceeds +180C (typ), the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to REMOVABLE LITHIUM ION OR 3-CELL ALKALINE IN Reverse OUT to Ground Current The MAX6469-MAX6484 maintain a low OUT-to-GND reverse-current flow when the IN power source is removed. When IN floats (input battery removed) and SHDN is pulled up to VOUT (by an external diode), the OUT MAX6469- MAX6484 3.3F 3.0V LITHIUM P MEMORY P MEMORY SHDN 5.0V 1A TOTAL CURRENT IN VCC = 3.3V REMOVABLE LITHIUM ION OR 3-CELL ALKALINE OUT IN OUT MAX6475/MAX6476 MAX6483/MAX6484 330 3.3F 0.1F MAX6469- MAX6484 RPULLUP P 3.3F SUPERCAP FB SHDN GND RESET Figure 2. High-Current, External Transistor Application 10 Figure 3. Battery Backup ______________________________________________________________________________________ 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Operating Region and Power Dissipation The MAX6469-MAX6484's maximum power dissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and the ambient air, and the rate of airflow. The power dissipation across the device is: P = IOUT (VIN - VOUT) The maximum power dissipation is: Choose R2 = 50k to maintain stability, accuracy and high-frequency power-supply rejection. Avoid selecting resistor values greater than 100k. In preset voltage mode, the impedance between SET and ground should always be less than 50k. In most applications, connect SET directly to ground. Low-Noise UCSP Output MAX6477-MAX6484 UCSP products include internal filtering to yield low output noise without an additional external bypass capacitor. The devices yield 75VRMS (typ) output noise (for VOUT = 3.0V) and 150VRMS (for V OUT = 3.3V). This low-noise feature makes the MAX6477-MAX6484 ideal for audio applications. Capacitor Selection and Regulator Stability Applications Information For stable operation over the full temperature range and with load currents up to 300mA, use a 3.3F (min) ceramic output capacitor with an ESR <0.2. To reduce noise and improve load transient response, stability, and power-supply rejection, use large output capacitor values such as 10F. Note that some ceramic capacitors exhibit large capacitance and ESR variation with temperature. With capacitor dielectrics such as Z5U and Y5V, use 4.7F or more to ensure stability over temperature. With X7R or X5R capacitor dielectrics, 3.3F should be sufficient at all operating temperatures. Higher ESR capacitors require more capacitance to maintain stability. A graph of the Region of Stable ESR vs. Load Current is shown in the Typical Operating Characteristics. To improve power-supply rejection and transient response, use a 1F capacitor between IN and GND. The MAX6469-MAX6484 remain stable with purely resistive loads or current loads up to 300mA. Output Voltage Selection Reset Transient Immunity The MAX6469-MAX6484 feature dual-mode operation: they operate in either a preset output voltage mode or an adjustable mode. In preset voltage mode, internal feedback resistors set the MAX6469-MAX6484's output from +1.5V to +3.3V (Table 1). Select this mode by connecting SET to ground (MAX6469-MAX6472/ MAX6477-MAX6480). In adjustable mode, select an output between 1.25V and 5.5V using two external resistors connected as a voltage-divider to SET (Figure 1). The output voltage is set by the following equation: VOUT = VSET (1 + R1 / R2) where VSET = 1.23V. To simplify resistor selection: The reset circuit is relatively immune to short-duration, falling V OUT transients. The Typical Operating Characteristics section shows a graph of the Maximum Transient Duration vs. Reset Threshold Overdrive for which reset is not asserted. The graph was produced using falling VOUT transients starting at VOUT and ending below the reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a falling VOUT transient can typically have without triggering a reset pulse. As the amplitude of the transient increases (i.e., goes further below the reset threshold), the maximum allowable pulse width decreases. Typically, a VOUT transient that goes only 10mV below the reset threshold and lasts for 75s does not trigger a reset pulse. PMAX = (TJ - TA) / (OJB + OBA) where TJ - TA is the temperature difference between the die junction and the surrounding air, OJB (or OJC) is the thermal resistance of the package, and OBA is the thermal resistance through the PC board, copper traces, and other materials to the surrounding air. The MAX6469-MAX6476 TDFN package O JC = 41C/W, and the MAX6469-MAX6476 SOT package O JC = 110C/W. The MAX6469-MAX6484's ground pin (GND) performs the dual function of providing an electrical connection to the system ground and channeling heat away. Connect GND to the system ground using a large pad or ground plane. For continuous operation, do not exceed the absolute maximum junction temperature rating of TJMAX = +150C. R1 = R2 (VOUT / VSET - 1) ______________________________________________________________________________________ 11 MAX6469-MAX6484 cool. The thermal sensor turns the pass transistor on again after the IC's junction temperature cools by 20C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection is designed to protect the MAX6469-MAX6484 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of TJMAX = +150C. MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Power Dissipation Consideration UCSP Reliability For the SOT23 package, any pin except the SET pin can be used as a heatsink. If the SET pin is used as a heatsink, excessive parasitic capacitance can affect stability. For the TDFN package, the exposed metal pad on the back side of a package connects to GND of the chip. This metal pad can be used as a heatsink. For general UCSP package information and PC layout considerations, refer to Maxim Application Note: WaferLevel Chip-Scale Package. The chip-scale package (UCSP) represents a unique packaging form factor that might not perform equally to a packaged product through traditional mechanical reliability tests. CSP reliability is integrally linked to the user's assembly methods, circuit-board material, and usage environment. The user should closely review these areas when considering a CSP package. Performance through operating life test and moisture resistance remains uncompromised, because it is primarily determined by the wafer-fabrication process. Mechanical stress performance is a greater consideration for a CSP package. CSPs are attached through direct solder contact to the user's PC board, forgoing the inherent stress relief of a packaged product's lead frame. Solder-joint contact integrity must be considered. Information on Maxim's qualification plan, test data, and recommendations are detailed in the UCSP application note on Maxim's website at www.maxim-ic.com. Table 1. Output Voltage Suffix Guide Table 2. Reset Threshold Accuracy Guide UCSP Consideration SUFFIX OUTPUT VOLTAGE (V) SUFFIX 15 1.5 A -7.5 16 1.6 B -12.5 17 1.7 18 1.8 19 1.9 20 2.0 21 2.1 22 23 VOUT RESET TOLERANCE (%) Table 3. Reset Timeout Delay Guide SUFFIX MINIMUM RESET TIMEOUT PERIOD (ms) 2.2 D1 2.5 2.3 D2 20 24 2.4 D3 150 25 2.5 D4 1200 26 2.6 27 2.7 28 2.8 285 2.85 29 2.9 30 3.0 31 3.1 32 3.2 33 3.3 Note: Factory-trimmed custom output voltages may be available; contact factory for availability. 12 ______________________________________________________________________________________ 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit DEVICE TOP MARK DEVICE TOP MARK MAX6469TA15BD3 ADO MAX6469TA18AD3 ADP MAX6469TA25BD3 MAX6469TA28AD3 ADQ ACT MAX6474TA33BD3 AEV MAX6475TA15BD3 AEW MAX6469TA30BD3 ADR MAX6469TA33AD3 ADS MAX6475TA18AD3 MAX6475TA25BD3 AEX AEY MAX6470TA15BD3 MAX6470TA18AD3 ADT ADU MAX6475TA28AD3 AEZ MAX6475TA30BD3 AFA MAX6470TA25BD3 ADV MAX6470TA28AD3 ADW MAX6475TA33AD3 MAX6476TA15BD3 ACZ AFB MAX6470TA30BD3 MAX6470TA33AD3 ADY ACU MAX6476TA18AD3 AFC MAX6476TA25BD3 AFD MAX6471TA15AD3 ADZ MAX6471TA18BD3 AEA MAX6476TA28AD3 MAX6476TA30BD3 AFE AEF MAX6471TA25AD3 MAX6471TA28BD3 AEB AEC MAX6476TA33AD3 AFG MAX6477BL15BD3 ABW MAX6471TA30AD3 AED MAX6471TA33BD3 AEE MAX6477BL18AD3 MAX6477BL25BD3 ABG ABX MAX6472TA15AD3 MAX6472TA18BD3 AEF ACW MAX6477BL28AD3 ABY MAX6477BL30BD3 ABZ MAX6472TA25AD3 AEG MAX6472TA28BD3 AEH MAX6477BL33AD3 MAX6478BL15BD3 ACA ACB MAX6472TA30AD3 MAX6472TA33BD3 AEI AEJ MAX6478BL18AD3 ACC MAX6478BL25BD3 ACD MAX6473TA15AD3 AEK MAX6473TA18BD3 AEL MAX6478BL28AD3 MAX6478BL30BD3 ACE ACF MAX6473TA25AD3 MAX6473TA28BD3 AEM AEN MAX6478BL33AD3 ACG MAX6479BL15AD3 ACH MAX6473TA30AD3 AEO MAX6473TA33BD3 AEP MAX6479BL18BD3 MAX6479BL25AD3 ACI ACJ MAX6474TA15AD3 MAX6474TA18BD3 AEQ AER MAX6479BL28BD3 ACK MAX6479BL30AD3 ACL MAX6474TA25AD3 AES MAX6479BL33BD3 ACM MAX6474TA28BD3 MAX6474TA30AD3 MAX6469-MAX6484 Table 4. Standard Versions AET AEU ______________________________________________________________________________________ 13 MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Table 4. Standard Versions (continued) DEVICE TOP MARK DEVICE TOP MARK ACN ACO MAX6482BL28AD3 ADB MAX6482BL30BD3 ADC MAX6480BL25BD3 ACP MAX6482BL33AD3 ADD MAX6480BL28AD3 ACQ MAX6480BL30BD3 MAX6480BL33AD3 ACR ABJ MAX6483BL15BD3 MAX6483BL18AD3 ADE ADF MAX6483BL25BD3 ADG MAX6481BL15BD3 ACS MAX6483BL28AD3 ADH MAX6481BL18AD3 ACT MAX6481BL25BD3 MAX6481BL28AD3 ACU ACV MAX6483BL30BD3 MAX6483BL33AD3 ADI ADJ MAX6484BL15BD3 ADK MAX6481BL30BD3 ACW MAX6484BL18AD3 ADL MAX6481BL33AD3 ACX MAX6482BL15BD3 MAX6482BL18AD3 ACY ACZ MAX6484BL25BD3 MAX6484BL28AD3 ADM ADN MAX6484BL30BD3 ADO MAX6482BL25BD3 ADA MAX6484BL33AD3 ADP MAX6480BL15BD3 MAX6480BL18AD3 Sample stock is generally available on standard versions only. Standard versions require a minimum order increment of 2.5k units. Nonstandard versions must be ordered in 10k-unit increments. Contact factory for availability. 14 ______________________________________________________________________________________ 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit TOP VIEW IN 1 GND 2 MAX6469 MAX6470 SHDN 3 OUT OUT 8 7 SET RESET 6 5 6 OUT IN 1 5 SET GND 2 4 RESET MAX6469 MAX6470 MAX6471 MAX6472 MR 3 6 OUT 5 SET 4 RESET EP* SOT23-6 1 2 IN IN 3 SOT23-6 4 GND SHDN TDFN OUT OUT 8 7 SET RESET 6 5 IN 1 GND 2 MAX6471 MAX6472 MAX6473 MAX6474 SHDN 3 6 OUT 5 MR 4 RESET OUT OUT 8 7 MR RESET 6 5 MAX6473 MAX6474 EP* EP* SOT23-6 1 2 3 4 1 2 IN IN GND MR IN IN TDFN IN 1 GND 2 MAX6475 MAX6476 SHDN 3 3 4 GND SHDN TDFN 6 OUT 5 FB 4 OUT OUT FB RESET 8 7 6 5 MAX6475 MAX6476 RESET SOT23-6 1 2 IN IN 3 4 GND SHDN TDFN *EP = EXPOSED PAD. ______________________________________________________________________________________ 15 MAX6469-MAX6484 Pin Configurations 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit MAX6469-MAX6484 Pin Configurations (continued) TOP VIEW IN GND SHDN IN GND SHDN A1 A2 A3 A1 A2 A3 MAX6481 MAX6482 MAX6477 MAX6478 C1 OUT C2 C3 C1 SET RESET OUT 3 x 3 UCSP C2 C3 MR RESET 3 x 3 UCSP IN GND MR IN GND SHDN A1 A2 A3 A1 A2 A3 MAX6483 MAX6484 MAX6479 MAX6480 C1 OUT C2 C3 C1 SET RESET OUT 3 x 3 UCSP C2 C3 FB RESET 3 x 3 UCSP UCSP DEVICES SHOWN AS MOUNTED ON PC BOARD. BALL SOLDERED DOWN. 16 ______________________________________________________________________________________ 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit IN SHDN IN THERMAL SENSOR REVERSE LEAKAGE PROTECTION OUT SHDN* THERMAL SENSOR REVERSE LEAKAGE PROTECTION OUT MOS DRIVER WITH CURRENT LIMIT MOS DRIVER WITH CURRENT LIMIT ERROR AMP FB ERROR AMP SET** FEEDBACK-MODE COMPARATOR 1.23V MAX6475/MAX6476 MAX6483/MAX6484 1.23V 185mV RESET TIMEOUT RESET TIMEOUT OUTPUT STAGE OUTPUT STAGE RESET RESET RESET COMPARATOR RESET COMPARATOR MAX6469-MAX6474 MAX6477-MAX6482 GND MR*** *MAX6469/MAX6470/MAX6473-MAX6478/MAX6481-MAX6484 **MAX6469-MAX6472/MAX6477-MAX6480 ***MAX6471-MAX6474/MAX6479-MAX6482 GND Typical Operating Circuit Chip Information TRANSISTOR COUNT: 1041 PROCESS: BiCMOS 2.5V TO 5.5V IN SHDN VCC OUT 3.3F MAX6469/MAX6470 MAX6477/MAX6478 SET RESET GND P RESET GND ______________________________________________________________________________________ 17 MAX6469-MAX6484 Functional Diagrams MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Ordering Information (continued) TEMP RANGE PINPACKAGE -40C to +85C 6 SOT23-6 TEMP RANGE PINPACKAGE MAX6471UT_ _ _D_-T -40C to +85C 6 SOT23-6 MAX6476UT_ _ _D_-T MAX6471TA_ _ _D_-T* -40C to +85C 8 TDFN-8 MAX6476TA_ _ _D_-T* -40C to +85C 8 TDFN-8 MAX6472UT_ _ _D_-T -40C to +85C 6 SOT23-6 MAX6477BL_ _ _D_-T -40C to +85C 6 UCSP-6 MAX6472TA_ _ _D_-T* -40C to +85C 8 TDFN-8 MAX6478BL_ _ _D_-T -40C to +85C 6 UCSP-6 PART PART MAX6473UT_ _ _D_-T -40C to +85C 6 SOT23-6 MAX6479BL_ _ _D_-T -40C to +85C 6 UCSP-6 MAX6473TA_ _ _D_-T* -40C to +85C 8 TDFN-8 MAX6480BL_ _ _D_-T -40C to +85C 6 UCSP-6 -40C to +85C 6 UCSP-6 MAX6474UT_ _ _D_-T -40C to +85C 6 SOT23-6 MAX6481BL_ _ _D_-T MAX6474TA_ _ _D_-T* -40C to +85C 8 TDFN-8 MAX6482BL_ _ _D_-T -40C to +85C 6 UCSP-6 MAX6475UT_ _ _D_-T -40C to +85C 6 SOT23-6 MAX6483BL_ _ _D_-T -40C to +85C 6 UCSP-6 8 TDFN-8 MAX6484BL_ _ _D_-T -40C to +85C 6 UCSP-6 MAX6475TA_ _ _D_-T* -40C to +85C *Future product--contact factory for availability. Note: The first "_ _"are placeholders for the output voltage levels of the devices. Desired output voltages are set by the suffix found in the Output Voltage Suffix Guide (Table 1). The third "_" is a placeholder for the reset threshold accuracy. Desired reset threshold accuracy is set by the suffix found in the Reset Threshold Accuracy Guide (Table 2). The "_" following the D is a placeholder for the reset timeout delay time. Desired reset timeout delay time is set by the suffix found in the Reset Timeout Delay Guide (Table 3). For example, the MAX6481BL30BD4-T has a 3.0V output voltage, 12.5% reset threshold tolerance, and a 1200ms (min) reset timeout delay. Sample stock is generally available on standard versions only (Table 4). Standard versions require a minimum order increment of 2.5k units. Nonstandard versions must be ordered in 10k-unit increments. Contact factory for availability. Selector Guide 18 PUSH-PULL RESET OPEN-DRAIN RESET PACKAGE -- -- SOT23-6/8-TDFN -- -- SOT23-6/8-TDFN -- -- SOT23-6/8-TDFN -- -- SOT23-6/8-TDFN -- -- SOT23-6/8-TDFN -- -- SOT23-6/8-TDFN -- -- SOT23-6/8-TDFN -- -- -- SOT23-6/8-TDFN -- -- -- 3 x 3 UCSP B9-3 MAX6478 -- -- -- 3 x 3 UCSP B9-3 MAX6479 -- -- -- 3 x 3 UCSP B9-3 MAX6480 -- -- -- 3 x 3 UCSP B9-3 MAX6481 -- -- -- 3 x 3 UCSP B9-3 MAX6482 -- -- -- 3 x 3 UCSP B9-3 MAX6483 -- -- -- 3 x 3 UCSP B9-3 MAX6484 -- -- -- 3 x 3 UCSP B9-3 PART SET SHDN MR FB MAX6469 -- MAX6470 -- MAX6471 -- MAX6472 -- MAX6473 -- MAX6474 -- MAX6475 -- MAX6476 MAX6477 ______________________________________________________________________________________ 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit 6LSOT.EPS PACKAGE OUTLINE, SOT 6L BODY 21-0058 I 1 2 ______________________________________________________________________________________ 19 MAX6469-MAX6484 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) PACKAGE OUTLINE, SOT 6L BODY 21-0058 20 ______________________________________________________________________________________ I 2 2 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit 9LUCSP, 3x3.EPS PACKAGE OUTLINE, 3x3 UCSP 21-0093 L 1 1 ______________________________________________________________________________________ 21 MAX6469-MAX6484 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 6, 8, &10L, DFN THIN.EPS MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit 22 ______________________________________________________________________________________ 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit COMMON DIMENSIONS PACKAGE VARIATIONS SYMBOL MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e A 0.70 0.80 T633-2 6 1.500.10 2.300.10 0.95 BSC MO229 / WEEA 0.400.05 1.90 REF D 2.90 3.10 T833-2 8 1.500.10 2.300.10 0.65 BSC MO229 / WEEC 0.300.05 1.95 REF E 2.90 3.10 T833-3 8 1.500.10 2.300.10 0.65 BSC MO229 / WEEC 0.300.05 1.95 REF A1 0.00 0.05 T1033-1 10 1.500.10 2.300.10 0.50 BSC MO229 / WEED-3 0.250.05 2.00 REF L 0.20 0.40 T1033-2 10 1.500.10 2.300.10 0.50 BSC MO229 / WEED-3 0.250.05 2.00 REF k 0.25 MIN. T1433-1 14 1.700.10 2.300.10 0.40 BSC ---- 0.200.05 2.40 REF A2 0.20 REF. T1433-2 14 1.700.10 2.300.10 0.40 BSC ---- 0.200.05 2.40 REF ______________________________________________________________________________________ 23 MAX6469-MAX6484 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MAX6469-MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Revision History REVISION NUMBER REVISION DATE 0 07/02 Initial release 4 04/05 Removed SOT23 standard versions from the data sheet. 5 12/07 Updated Typical Operating Characteristics and Pin Descriptions sections. DESCRIPTION PAGES CHANGED -- 13, 14 1, 5, 7, 8 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.