MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits General Description The MAX16052/MAX16053 are a family of small, low-power, high-voltage monitoring circuits with sequencing capability. These miniature devices offer very wide flexibility with an adjustable voltage threshold and an external capacitoradjustable time delay. These devices are ideal for use in power-supply sequencing, reset sequencing, and power switching applications. Multiple devices can be cascaded for complex sequencing applications. A high-impedance input (IN) with a 0.5V threshold allows an external resistive-divider to set the monitored threshold. The output (OUT) asserts high when the input voltage rises above the 0.5V threshold and the enable input (EN) is asserted high. When the voltage at IN falls below 0.495V or when the enable input is de-asserted (EN = low), the output deasserts (OUT = low). The devices provide a capacitor programmable delay time from when the voltage at IN rises above 0.5V to when the output is asserted. The MAX16052 offers an active-high open-drain output while the MAX16053 offers an active-high push-pull output. Both devices operate from a 2.25V to 28V supply voltage and feature an active-high enable input. The MAX16052/ MAX16053 are available in a tiny 6-pin SOT23 package and are fully specified over the automotive temperature range (-40C to +125C). Benefits and Features Less External Circuitry Results in Smaller Solution Size * Open-Drain (28V Tolerant) Output Allows Interfacing to 12V Intermediate Bus Voltage * Operates from VCC of 2.25V to 28V * Small 6-Pin SOT23 Package Ideal for Use in Power-Supply Sequencing, Reset Sequencing, and Power-Switching Applications * Active-High Logic-Enable Input * 1.8% Accurate Adjustable Threshold Over Temperature Fully Specified from -40C to +125C for Reliability in Extreme Temperatures Low Supply Current (18A typ) Reduces Power Consumption Applications Medical Equipment Intelligent Instruments Portable Equipment Computers/Servers Critical P Monitoring Set-Top Boxes Telecom Typical Operating Circuit DC-DC CONVERTER 12V VCC EN VCC EN IN IN MAX16052 OUT CDELAY GND 19-4144; Rev 6; 8/16 EN OUT 0.9V IN MAX16052 DC-DC CONVERTER OUT CDELAY GND MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits Absolute Maximum Ratings (All voltages referenced to GND.) VCC........................................................................-0.3V to +30V OUT (push-pull, MAX16053).....................-0.3V to (VCC + 0.3V) OUT (open-drain, MAX16052)................................-0.3V to +30V EN, IN ........................................................-0.3V to (VCC + 0.3V) CDELAY....................................................................-0.3V to +6V Input/Output Current (all pins)..........................................20mA Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 8.7mW/C above +70C)........695.7mW Operating Temperature Range .........................-40C to +125C Junction Temperature.......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C 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 (VCC = 2.25V to 28V, VEN = VCC, TA = TJ = -40C to +125C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 2.25 28 V 1.8 2 V SUPPLY Operating Voltage Range Undervoltage Lockout VCC UVLO VCC falling (Note 2) MAX16052, no load VCC Supply Current ICC MAX16053, no load VCC = 3.3V 18 37 VCC = 12V 23 45 VCC = 28V 38 61 VCC = 3.3V 22 47 VCC = 12V 29 57 VCC = 28V 44 71 0.509 A IN Threshold Voltage Hysteresis Input Current VTH VIN rising, 2.25V VCC 28V 0.491 0.500 VIN = 0 or 28V -110 +25 +110 nA ICD VCDELAY = 0V 200 250 300 nA VTCD VCDELAY rising 0.95 V VHYST IIN VIN falling 5 V mV CDELAY CDELAY Charge Current CDELAY Threshold CDELAY Pulldown Resistance EN EN Low Voltage EN High Voltage EN Leakage Current RCDELAY 1.00 1.05 VCC 2.25V, ISINK = 200A 15 60 VCC 3.3V, ISINK = 1mA 15 60 VIL VIH ILEAK 0.5 V +110 nA 1.4 VEN = 0 or 28V -110 V +20 OUT OUT Low Voltage (Open-Drain or Push-Pull) VOL OUT High Voltage (Push-Pull, MAX16053) VOH OUT Leakage Current (Open-Drain, MAX16052) ILKG www.maximintegrated.com VCC 1.2V, ISINK = 90A 0.2 VCC 2.25V, ISINK = 0.5mA 0.3 VCC > 4.5V, ISINK = 1mA 0.4 VCC 2.25V, ISOURCE = 500A 0.8 x VCC VCC 4.5V, ISOURCE = 800A 0.9 x VCC Output not asserted low, VOUT = 28V V V 150 nA Maxim Integrated 2 MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits Electrical Characteristics (continued) (VCC = 2.25V to 28V, VEN = VCC, TA = TJ = -40C to +125C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TIMING VCC = 3.3V, VIN rising, VIN = VTH + 25mV IN to OUT Propagation Delay tDELAY VCC = 12V, VIN rising, VIN = VTH + 25mV tDL Startup Delay (Note 3) EN Minimum Input Pulse Width MAX16052, 100k pullup resistor, CCDELAY = 0 30 MAX16053, CCDELAY = 0 30 MAX16052, 100k pullup resistor, CCDELAY = 0.047F 190 MAX16053, CCDELAY = 0.047F 190 MAX16052, 100k pullup resistor, CCDELAY = 0 30 MAX16053, CCDELAY = 0 30 EN to OUT Delay ms VCC = 3.3V, VIN falling, VIN = VTH - 30mV VCC = 12V, VIN falling, VIN = VTH - 30mV 18 18 VCC = 2.25V, VIN = 0.525V, CCDELAY = 0 0.5 VCC = 12V, VIN = 12V, CCDELAY = 0 0.5 tMPW 1 EN Glitch Rejection EN to OUT Delay s tOFF tPROP From device disabled to device enabled MAX16052, 100k pullup resistor MAX16053 MAX16052, 100k pullup resistor, CCDELAY = 0 MAX16053 ms s 100 From device enabled to device disabled s VCC = 3.3V 250 VCC = 12V 300 VCC = 3.3V 350 VCC = 12V 400 VCC = 3.3V 14 VCC = 12V 14 VCC = 3.3V 14 VCC = 12V 14 MAX16052, 100k pullup resistor, CCDELAY = 0.047F 190 MAX16053, CCDELAY = 0.047F 190 ns ns s ms Note 1: All devices are production tested at TA = +25C. Limits over temperature are guaranteed by design. Note 2: When VCC falls below the UVLO threshold, the outputs deassert (OUT goes low). When VCC falls below 1.2V, the output state cannot be determined. Note 3: During the initial power-up, VCC must exceed 2.25V for at least 0.5ms before OUT can go high. www.maximintegrated.com Maxim Integrated 3 MAX16052/MAX16053 VCC High-Voltage, Adjustable Sequencing/Supervisory Circuits VUVLO VTH + 25mV VTH - VHYST IN VTH t < tPROP EN VIH VIH VIH VIL VIL 5% VIH t < tMPW t > tMPW VOH OUT VOL tPROP tDL tDELAY tOFF tPROP Figure 1. MAX16052/MAX16053 Timing Diagram (CCDELAY = 0) www.maximintegrated.com Maxim Integrated 4 MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits Typical Operating Characteristics (VCC = 3.3V and TA = +25C, unless otherwise noted.) MAX16052 VIN = 0V 30 27 24 21 18 15 36 32 12 VCC = 28V 28 VCC = 12V 24 20 9 16 6 3 12 VCC = 3.3V VCC = 2.25V 8 0 8 4 12 16 20 24 4 28 -40 -25 -10 5 20 35 50 65 80 95 110 125 VCC (V) 500.5 500.0 499.5 499.0 3000 2500 2000 1500 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 CCDELAY (nF) OUTPUT LOW VOLTAGE vs. SINK CURRENT OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT 2.0 VCC = 12V 1.5 VCC = 5V 1.0 VCC = 3.3V VCC = 2.25V 30 OUTPUT HIGH VOLTAGE (V) VCC = 28V 0.5 0 100 200 300 400 500 600 700 800 900 1000 TEMPERATURE (C) MAX16052/53 toc05 OUTPUT LOW VOLTAGE (V) 3500 500 2.5 0 4000 1000 498.5 498.0 4500 OUT DELAY (ms) 501.0 MAX16052/53 toc04 501.5 OUT DELAY vs. CCDELAY 5000 MAX16052/53 toc03 IN THRESHOLD VOLTAGE (mV) TEMPERATURE (C) IN THRESHOLD VOLTAGE vs. TEMPERATURE 502.0 VCC = 5V 25 MAX16052/53 toc06 0 MAX16052 40 ICC (A) ICC (A) 44 MAX16052/53 toc01 33 SUPPLY CURRENT vs. TEMPERATURE MAX16052/53 toc02 SUPPLY CURRENT vs. SUPPLY VOLTAGE VCC = 28V 20 VCC = 12V VCC = 5V 15 VCC = 3.3V 10 VCC = 2.25V 5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 ISINK (mA) www.maximintegrated.com 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 ISOURCE (mA) Maxim Integrated 5 MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits Typical Operating Characteristics (continued) (VCC = 3.3V and TA = +25C, unless otherwise noted.) 250 ENABLE TURN-OFF DELAY (MAX16053) MAX16052/53 toc08 MAX16052/53 toc07 300 MAX16052/53 toc09 EN 2V/div 200 EN 2V/div RESET OCCURS ABOVE THIS CURVE 150 OUT 2V/div OUT 2V/div 100 50 1 10 100 1000 10s/div INPUT OVERDRIVE (mV) IN LEAKAGE CURRENT (mA) 8 6 IN LEAKAGE CURRENT vs. TEMPERATURE VCC = 28V VCC = VEN = VIN 4 MAX16052/53 toc10 10 400ns/div 2 0 -2 -4 -6 1 0 IN LEAKAGE CURRENT vs. IN VOLTAGE MAX16052/53 toc11 0 IN LEAKAGE CURRENT (nA) MAXIMUM TRANSIENT DURATION (s) ENABLE TURN-ON DELAY (MAX16053) MAXIMUM TRANSIENT DURATION vs. INPUT OVERDRIVE VCC = 28V VCC = VEN -1 -2 -3 -8 6 VIN (V) EN LEAKAGE CURRENT vs. TEMPERATURE EN LEAKAGE CURRENT vs. EN VOLTAGE VCC = 28V VCC = VEN = VIN 4 2 0 -2 -4 -6 0.8 0.6 VCC = 28V VCC = VIN 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -8 -10 1.0 MAX16052/53 toc13 EN LEAKAGE CURRENT (nA) 8 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 TEMPERATURE (C) EN LEAKAGE CURRENT (nA) 10 -4 -40 -25 -10 5 20 35 50 65 80 95 110 125 MAX16052/53 toc12 -10 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) www.maximintegrated.com -1.0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 VEN (V) Maxim Integrated 6 MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits Pin Configuration TOP VIEW 1 EN 2 GND 3 IN CDELAY 6 MAX16052 MAX16053 VCC 5 OUT 4 SOT23 Pin Description PIN NAME 1 EN 2 GND 3 IN High-Impedance Monitor Input. Connect IN to an external resistive-divider to set the desired monitor threshold. The output changes state when VIN rises above 0.5V and when VIN falls below 0.495V. 4 OUT Active-High Sequencer/Monitor Output. Open-drain (MAX16052) or push-pull (MAX16053). OUT is asserted to its true state (OUT = high) when VIN is above VTH and the enable input is in its true state (EN = high) after the capacitor-adjusted delay period. OUT is de-asserted to its false state (OUT = low) immediately after VIN drops below 0.495V or the enable input is in its false state (EN = low). The MAX16052 open-drain output requires an external pullup resistor. 5 VCC Supply Voltage Input. Connect a 2.25V to 28V supply to VCC to power the device. For noisy systems, bypass with a 0.1F ceramic capacitor to GND. 6 CDELAY Capacitor-Adjustable Delay Input. Connect an external capacitor (CCDELAY) from CDELAY to GND to set the IN-to-OUT and EN-to-OUT delay period. For VIN rising, tDELAY = (CCDELAY x 4.0 x 106) + 30s. For EN rising, tPROP = (CCDELAY x 4.0 x 106) + 14s. www.maximintegrated.com FUNCTION Active-High Logic-Enable Input. Drive EN low to immediately de-assert the output to its false state (OUT = low) independent of VIN. With VIN above VTH, drive EN high to assert the output to its true state (OUT = high) after the adjustable delay period. Connect EN to VCC, if not used. Ground Maxim Integrated 7 MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits VCC REF VCC INTERNAL VCC/UVLO IN OUT 0.5V INTERNAL VCC/UVLO REF IN 0.5V CONTROL LOGIC EN GND CONTROL LOGIC EN OUT 250nA 250nA 1.0V 1.0V GND MAX16053 MAX16052 CDELAY CDELAY Figure 2. Simplified Functional Diagram Detailed Description The MAX16052/MAX16053 family of high-voltage, sequencing/supervisory circuits provide adjustable voltage monitoring for inputs down to 0.5V. These devices are ideal for use in power-supply sequencing, reset sequencing, and power-switching applications. Multiple devices can be cascaded for complex sequencing applications. The MAX16052/MAX16053 perform voltage monitoring using a high-impedance input (IN) with an internally fixed 0.5V threshold. When the voltage at IN falls below 0.5V or when the enable input is de-asserted (EN = low) OUT goes low. When VIN rises above 0.5V and the enable input is asserted (EN = high), OUT goes high after a capacitor-adjustable time delay. With VIN above 0.5V, the enable input can be used to turn on or off the output. Table 1 details the output state depending on the various input and enable conditions. www.maximintegrated.com Table 1. MAX16052/MAX16053 IN EN OUT VIN < VTH Low Low VIN < VTH High Low VIN < VTH Low Low High OUT = High Impedance (MAX16052) VIN > VTH OUT = VCC (MAX16053) Supply Input (VCC) The device operates with a VCC supply voltage from 2.25V to 28V. In order to maintain a 1.8% accurate threshold at IN, VCC must be above 2.25V. When VCC falls below the UVLO threshold, the output deasserts low. When VCC falls below 1.2V, the output state is not guaranteed. For noisy systems, connect a 0.1F ceramic capacitor from VCC to GND as close to the device as possible. Maxim Integrated 8 MAX16052/MAX16053 Monitor Input (IN) Connect the center point of a resistive-divider to IN to monitor external voltages (see R1 and R2 of Figure 4). IN has a rising threshold of VTH = 0.5V and a falling threshold of 0.495V (5mV hysteresis). When VIN rises above VTH and EN is high, OUT goes high after the adjustable tDELAY period. When VIN falls below 0.495V, OUT goes low after a 18s delay. IN has a maximum input current of 60nA, so large value resistors are permitted without adding significant error to the resistive-divider. Adjustable Delay (CDELAY) When VIN rises above VTH with EN high, the internal 250nA current source begins charging an external capacitor connected from CDELAY to GND. When the voltage at CDELAY reaches 1V, the output asserts (OUT goes high). When the output asserts, CCDELAY is immediately discharged. Adjust the delay (tDELAY) from when VIN rises above VTH (with EN high) to OUT going high according to the equation: = t DELAY C CDELAY x (4 x 10 6 ) + (30s) where tDELAY is in seconds and CCDELAY is in Farads. Enable Input (EN) The MAX16052/MAX16053 offer an active-high enable input (EN). With VIN above VTH, drive EN high to force OUT high after the capacitor-adjustable delay time. The EN-to-OUT delay time (tPROP) can be calculated from when EN goes above the EN threshold using the equation: = t PROP C CDELAY x (4 x 10 6 ) + (14s) where tPROP is in seconds and CCDELAY is in Farads. Drive EN low to force OUT low within 300ns for the MAX16052 and within 400ns for the MAX16053. Output (OUT) The MAX16052 offers an active-high, open-drain output while the MAX16053 offers an active-high push-pull output. The push-pull output is referenced to VCC. The open-drain output requires a pullup resistor and can be pulled up to 28V. High-Voltage, Adjustable Sequencing/Supervisory Circuits some conveniently high value (200k for 1% additional variation in threshold, for example) and calculate R1 based on the desired monitored voltage using the following formula: V R1 = R2 x MONITOR - 1 V TH where VMONITOR is the desired monitored voltage and VTH is the reset input threshold (0.5V). Pullup Resistor Values (MAX16052 Only) The exact value of the pullup resistor for the open-drain output is not critical, but some consideration should be made to ensure the proper logic levels when the device is sinking current. For example, if VCC = 2.25V and the pullup voltage is 28V, keep the sink current less than 0.5mA as shown in the Electrical Characteristics table. As a result, the pullup resistor should be greater than 56k. For a 12V pullup, the resistor should be larger than 24k. Note that the ability to sink current is dependent on the VCC supply voltage. Ensuring a Valid OUT Down to VCC = 0V (Push-Pull OUT) In applications in which OUT must be valid down to VCC = 0V, add a pulldown resistor between OUT and GND for the push-pull output (MAX16053). The resistor sinks any stray leakage currents, holding OUT low (Figure 3). The value of the pulldown resistor is not critical; 100k is large enough not to load OUT and small enough to pull OUT to ground. The external pulldown cannot be used with the open-drain OUT output. VCC VCC OUT MAX16053 100k Applications Information Input Threshold The MAX16052/MAX16053 monitor the voltage on IN with an external resistive-divider (Figure 4). R1 and R2 can have very high values to minimize current consumption due to low IN leakage currents (60nA max). Set R2 to www.maximintegrated.com GND Figure 3. Ensuring OUT Valid to VCC = 0V Maxim Integrated 9 MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits Typical Application Circuits Figure 4 through Figure 6 show typical applications for the MAX16052/MAX16053. Figure 4 shows the MAX16052 used with a pMOSFET in an overvoltage protection circuit. Figure 5 shows the MAX16053 in a low-voltage sequencing application using an nMOSFET. Figure 6 shows the MAX16053 used in a multiple output sequencing application. Using an n-Channel Device for Sequencing In higher power applications, using an n-channel device reduces the loss across the MOSFET as it offers a lower drain-to-source on-resistance. However, an nMOSFET requires a sufficient VGS voltage to fully enhance it for a low RDS_ON. The application shown in Figure 5 shows the MAX16053 in a switch sequencing application using an nMOSFET. Similarly, if a higher voltage is present in the system, the open-drain version can be used in the same manner. Power-Supply Bypassing In noisy applications, bypass VCC to ground with a 0.1F capacitor as close to the device as possible. The additional capacitor improves transient immunity. For fast-rising VCC transients, additional capacitors may be required. 3.3V ALWAYS-ON 5V BUS N P 0 TO 28V EN R1 MONITORED 3.3V RPULLUP VCC EN VCC MAX16053 MAX16052 IN IN CDELAY R2 GND Figure 4. Overvoltage Protection www.maximintegrated.com 1.2V OUTPUT OUT R1 OUT 1.2V INPUT CDELAY CCDELAY R2 GND CCDELAY Figure 5. Low-Voltage Sequencing Using an nMOSFET Maxim Integrated 10 MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits 2.5V 3.3V DC-DC 5V BUS DC-DC EN 1.2V 1.8V DC-DC EN DC-DC EN EN SYSTEM ENABLE EN IN VCC MAX16053 EN OUT IN VCC MAX16053 EN OUT GND GND IN MAX16053 EN IN OUT GND CCDELAY CCDELAY VCC VCC MAX16053 OUT GND CCDELAY CCDELAY Figure 6. Multiple Output Sequencing Ordering Information Package Information PART OUTPUT PINPACKAGE TOP MARK MAX16052AUT+T Open-Drain 6 SOT23 +ACLW MAX16053AUT+T Push-Pull 6 SOT23 +ACLX Note: All devices operate over the -40C to +125C operating automotive temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel, offered in 2.5k increments. For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 6 SOT23 U6+1 21-0058 90-0175 Chip Information PROCESS: BiCMOS www.maximintegrated.com Maxim Integrated 11 MAX16052/MAX16053 High-Voltage, Adjustable Sequencing/Supervisory Circuits Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 5/08 Initial release 1 10/08 Update Adjustable Delay (CDELAY) and Power-Supply Bypassing sections. 2 1/10 Revised the Features, General Description, Absolute Maximum Ratings, Electrical Characteristics, Typical Operating Characteristics, Pin Description, and the Supply Input (VCC) sections. 3 4/14 No /V OPNs; removed Automotive reference from Applications section 1 4 5/15 Added the Benefits and Features section 1 5 3/16 Updated package outline drawing number in Ordering Information table 12 6 8/16 Updated Table 1 8 DESCRIPTION -- 9, 10 1, 2, 3, 5-8 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2016 Maxim Integrated Products, Inc. 12 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX16052AUT+T MAX16053AUT+T