19-1225; Rev 2: 1/98 MA AAXLAV High-Voltage, Low-Power Linear Regulators General Description The MAX1615/MAX1616 are micropower, SOT23-5 lin- ear regulators that supply always-on, keep-alive power to CMOS RAM and microcontrollers (uCs) in systems with high-voltage batteries. Key features include wide input voltage range, low dropout voltage, and low qui- escent supply current. Despite a miserly 8UA (max) no-load supply current, the MAX1615/MAX1616 have excellent line-transient response and AC power-supply rejection ratio. They provide a clean, fixed 5V or 3.3V output (MAX1615) or an adjustable 1.24V to 28V output (MAX1616), even when subjected to fast supply-voltage changes that occur during the switchover from battery to AC adapter input power. The space-saving SOT23-5 package has excellent thermal characteristics and tolerates up to 571mW of power dissipation. Fault protection is provid- ed by internal foldback current limiting and thermal- shutdown circuitry. Applications CMOS/RTG Backup Power Microcontroller Power Notebook Computers Smart-Battery Packs PDAs and Handy-Terminals Battery-Powered Systems Typical Operating Circuit for Notebook Computers Features * 6+ * + + 4V to 28V Input Range 8yA (max) Quiescent Supply Current <1pA Shutdown Supply Current 3.3V or 5V, Pin-Selectable Output (MAX1615) Adjustable 1.24V to 28V Output (MAX1616) 30mA Output Current 42% Initial Output Accuracy Thermal-Overload Protection 5-Pin SOT23 Package Low Cost Ordering Information PIN- SOT PART TEMP.RANGE pacxaGe TOP MARK MAXI615EUK-T -40Cto+85% 5S0T23-5 ABZD MAXI616EUK-T -40Cto+85% 5807235 ABZE Pin Configuration IN OUT OUTPUT VOLTAGE JAAXIAVI MAX1615 + Cour SN 47UF TOP VIEW whi] [5] SHON MAXIM MAX1615 ono [2] smaxter6 out [3 | [4] 53 By SOT23-5 |.) AREFORMAXt616. MAAXLAA Maxim Iniegrated Producis 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468. GQLOLXVWGLOLXVWNMAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers ABSOLUTE MAXIMUM RATINGS IN to GND ooo cece ccc ccceeecescesecessesntsesenstenserarens -0.3V to 30V Terminal Voltages to GND SHDN to GND... cece cece cee eee ees -0.3V to (VIN + 0.3V) B/S to GND oo eceeccceeeeeeeaearaeereenens -0.3V to (VouUT + 0.3V) FB (MAX1616) to GND oe. -0.3V to (VouT + 0.3V) QUT to GNDa owe ccc cecceecsseencesteeseetnereee -0.3V to 30V OUT Short-Circuit to GND 00... cceeeceecsts acces 30sec Note 1: See Operating Region and Power Dissipation section. Continuous OUT Current... eee ee eeneeeee 40mA Continuous Power Dissipation (Ta = +70C) (Note 1) SOT23-5 (derate 7.1mW/%S above +70%) 0. 571mW Operating Temperature Range MAX161_EUK-T oo ceeceeeeerrrteeenrerenees Storage Temperature Range..........0....... . Lead Temperature (soldering, 10sec) Siresses beyand those listed under Absolute Maximum Ratings may cause permanent damage to lhe 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 = 15V, SHDN = Vin, ILoap = SpA, Ta = TMIN to Tmax, unless otherwise noted. Typical values are at Ta = +25G.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX | UNITS Input Voltage Range VIN 4 28 Vv SHDN = IN, Ta = +25C 6.2 8 Supply Current lIN pA SHDN = IN, Vin = 6V to 28V, Ta = TMIN to Tmax 15 Minimum Load Current 5 pA = Ta = +25 1.5 Shutdown Supply Current lin SHDN = GND * LA (shutdown mode) TMIN = TMIN to TMAK 3 Output set to 5V, _ Dropout Supply Current Vin = 4V TA = +25 70 pA ILoaD = imA, 5/3 = GND 3.26 3.33 3.40 Ta = +25C, Output Voltage (MAX1615) VIN = 6V to 28V 5/3 = OUT 495 505 35.15 V (Note 3) LOAD = 5A to 30mA, | 5/3 = GND 3.15 3.48 Ta = TMIN to TMAX, VIN = 6V to 28V 5/3 = OUT 4.75 5.25 Ta = +25%, 1.215 1.240 1.265 FB Threshold (MAX1616} Vv FB = OUT, ILaaD = 1mA Vv ILOAD = 5A to 30mA , FB Input Current (MAX1616} IFB VFB = 1.3V -10 12 30 nA Dropout Voltage AVBO ILOAD = 30mA (Note 4) 350 mv Qutput Current Limit VIN = 6V 100 mA OUT Reverse Leakage Current IN = unconnected, Vout forced to 5V 70 pA Capacitive Load MAX1615 0.16 . pF/mA Requirements (Note 5) MAX1616 0.23 Rising edge of IN or SHDN to OUT within specifi- Start-Up Time Response cation limits, RL = 50092, Court = 6.8HF, 1 ms VouT set to 5V RL = 5000, Cout = 10pF within 90% of naminal Start-Up Overshoot VosH output voltage 0.5 % VOUT 2 MAAXIAMHigh-Voltage, Low-Power Linear Regulators for Notebook Computers ELECTRICAL CHARACTERISTICS (continued) (VIN = 15V, SHDN = Vin, ILoap = 5HA, TA = TMIN to TMAx, unless otherwise noted. Typical values are at Ta = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX | UNITS SHDN Input Threshold VIL 0.25 V Voltage VIH 14 SHDN Input Current V SHDN = OV or 15V | 1 pA Thermal-Shutdown . Temperature TSHDN V SHDN = OV or 15V, hysteresis = +20C 150 os Note 2: Limits are 100% production tested at Ta = +25C. Limits over the operating temperature range are guaranteed through correlation using standard quality-control (SQC) methods. Note 3: Pulse tested at VIN = 28V, ILoaD = 30mA to avoid exceeding package power-dissipation limits. Note 4: Guaranteed by design. Tested with Vout set to 5V. Dropout voltage is tested by reducing the input voltage until VouT drops to 100mV below its nominal value, measured with Vin starting 2V above VouT. Note 5: Use at least 1pF minimum for light loads. Add 0.125yF/mA (0.2uF/mA for the MAX1616) for loads greater than 100pA, not production tested. See Capacitor Selection in the Applications information section. Typical Operating Characteristics (VouT set to 5V, Ta = +25, unless otherwise noted.) SAFE LOAD-CURRENT GAQUND CURRENT OPERATING AREA vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. SUPPLY VOLTAGE AT VARI QUS LOADS vs. SUPPLY VOLTAGE 60 5 8 3 3.0 Vour=5 2 & 50 z 7 5 85 =z = z= 80 zy z % 5 75 i i 70 = 30 7 = 3 4 3 T 3G 3G 5 i mM 2 3 mo6s 5 2 . 2 5 t oe 40 10 1 |POWER | 1 | DISSIPATION 1 55 . 1 | LIMIT REGION Ta= 40C 0 ; 0 5.0 0 @ 4% #2 25 30 5 10 16 20 25 30 5 10 16 20 a 30 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V} MA AXIAA 3 GQLOLXVWGLOLXVWNMAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers (VOUT set to 5V, Ta = +25C, unless otherwise noted.) TIMETO EXIT SHUTDOWN LINE- TRANSIENT RESPONSE SHUTDOWN SUPPLY CURRENT (1A) DROPOUT SUPPLY CURRENT (1A) a Leet sfed tense ternal SOs! 40 42 44 46 48 50 S2 1 div bee | Ta= 485C SHUTDOWN SUPPLY GURRENT vs. SUPPLY VOLTAGE MARIE I5-O4 8 lz 16 20 24 2 SUPPLY VOLTAGE (V) RIPPLE REJECTION (cB) MAKI615-07 MAXI615- 06, ops Gn. 10F SOusidiv DROPOUT SUPPLY CURRENT ys. SUPPLY VOLTAGE MAKIET5-09 64 SUPPLY VOLTAGE (V) 5.6 58 6.0 Vin - Your () Typical Operating Characteristics (continued) RIPPLE REJECTION vs. FREQUENCY -70 -60 6 Ad 30 Pa 10 Laan = 10mA 0 0.01 O41 1 19 109 FREQUENCY (kHz LOAD-TRANSIENT RESPONSE MAK 1615-09 | +20V ; Vin - : - +10V serie - _ase "1 a Pig bali 4 nil I inh cua | Vour | Ea : Somviaiv Your et | EomVvidiv : , , ; lout | 30mAaiv 100us/div DROPOUT VOLTAGE vs. LOAD CURRENT 030 rae | 8 O25 rs = Lo 020 O45 LA b.10 [ 1 0.05 0 0 5 i 15 20 2 3 35 40 LOAD CURRENT (mA) MAAXIAAHigh-Voltage, Low-Power Linear Regulators for Notebook Computers Pin Description PIN NAME FUNCTION MAX1615 MAX1616 1 1 IN Positive Input Voltage. Gonnect to a +4V to +28V supply. 2 2 GND Ground 3 3 OUT Regulator Output 4 Preset Output Voltage Select. Connect to GND for 3.3V output or to OUT _ 5/3 for 5.0 output. 4 FB Feedback Input. Regulates to 1.24V nominally. 5 5 SHDN Shutdown, active low input. Connect to IN for automatic start up. The MAX1615's output voltage is fed back through an | internal resistor voltage divider connected to OUT. Set the output voltage to either 3.3 or 5.0V with the 5/3 pin. Ver Select the 5V output by connecting 5/3 to OUT, or the 3.3V output by connecting 5/3 to GND. = The MAX1616 uses external feedback, allowing the out- put voltage to be set by external resistors (see Setting the MAX1616 Output Voltage section). The typical FB threshold is at 1.24V. _Ia, SA AXL/VI SHDN MAXI615 Shutdown MAX1616 FB (MAXt616) (MAXt615) | | Figure f. Functional Diagram Detailed Description The MAX1615/MAX1616 low-quiescent-current linear regulators are designed primarily for high input voltage applications. The MAX1615 supplies a preselected 3.3V or 5.0 output for loads up to 30mA. The MAX1616 provides an adjustable voltage from 1.24V tc 28V. The maximum output current is a function of the package's maximum power dissipation for a given temperature. A 5A load is required to maintain output regulation. MA AXIAA The device enters shutdown mode when SHDN is low. In shutdown mode, the pass transistor, control circuit, reference, and all biases turn off, reducing the supply current to below 1A. Connect SHDN to IN for automatic start-up. Current Limit Output current is limited to 100mA (typical). The current limit exceeds the 30mA (max) safe operating limit. The output can be shorted to ground for 30 seconds without damaging the part. Thermal-Overload Protection When the junction temperature exceeds Ty = +150C, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor turns the pass transistor on again after the IGs junction temperature cools by +20C (typical), resulting in a pulsating output during continuous thermal-overload conditions. Operating Region and Power Dissipation Maximum power dissipation depends on the thermal resistance of the case and circuit board, the tempera- ture difference between the die junction and ambient air, and the rate of air flow. The device's power dissipa- 5 GQLOLXVWGLOLXVWNMAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers tion is P = IOUT (VIN - VOUT). The power dissipation at +70G ambient is 571mW (see Absolute Maximum Ratings). The thermal resistance junction-to-case of the SOT23-5 package is 81C/W, and the maximum safe junction temperature is +150C. The GND pin performs the dual function of providing an electrical connection to ground and channeling heat away. Connect GND to ground using a large pad or ground plane. Applications Information Setting the MAX76176 Output Voltage Set the MAX1616's output voltage with two resistors, R1 and Re (Figure 2). Choose R@ = 250k to maintain a 5A minimum load and calculate R1 using the following equation: R1 = R2 [Your - | VEBT where VEBT = 1.244 (typical). Capacitor Selection Use a 0.1HF minimum capacitor on the input. Higher values will improve line-transient response. Use 1pF minimum on the output, or 4.7pF for the full 30mA load current (6.8uF, MAX1616). Otherwise, use TWF plus 0.125uF/mA (O.2uF/UA, MAX1616}. For output voltages less than 3.3V, use 15uF instead of 6.8uF. The output capacitor's effective series resistance (ESR) must be less than 1Q for stable operation. Output Voltage Noise The MAX1615/MAX1616 typically exhibit 5mVp-p of noise during normal operation. This is negligible in most applications. In applications that include analog- to-digital converters (ADCs) of more than 12 bits, con- sider the ADC's power-supply-rejection specifications. Transient Response The Typical Operating Characteristics show the MAX1615/MAX1616's load-transient response. Two of the output responses components can be observed on the load-transient graph: a DC shift from the output impedance due to the different load currents, and the transient response. Typical step changes in the load current from 10mA to 20mA produce 50mV transients. Increasing the output capacitor's value attenuates tran- sient spikes. 4{5uF for Vout <3.3 IN OUT MAXIM MAX1616 FB SHDN OUTPUT VOLTAGE Ri + 6.8uF Figure 2. MAX1616 Typical Application Circutt Table 1. Surface-Mount Capacitor Manufacturers TYPE MANUFACTURER CAPACITOR AVX TPS series Electrolytic Matsuo 267 series Sprague 593D, 595 series AVX X7R Ceramic Matsuo X7R Table 2. Component Suppliers SUPPLIER PHONE FAX AVX (803) 946-0690 (803) 626-3123 Matsuo (714) 969-2491 (714) 960-6492 Sprague (603) 224-1961 (603) 224-1430 TRANSISTOR COUNT: 386 Chip Information MAAXIAAHigh-Voltage, Low-Power Linear Regulators for Notebook Computers Tape-and-Reel Information { E Xn tPp Po >| be , Bo mm AY a my fm rs Lh two YY TS Tow o?P ' F Dy co rn ry O O O Ye O == _S=====n FT NOTE: DIMENSIONS ARE IN MM. t P i$ K 0) AND FOLLOW EIA481-1 STANDARD. Ag | | Ag 3.200 +0.102 E 1.753 +0.102 Po 3.988 +0.102 Bo 3.099 +0.102 F 3.505 +0.051 P10 40.005 +0.203 +0.102 K 1.397 +0.102 Po 2.007 +0.051 D 1.499 +0.000 eee a TTT P 3.988 +0.102 t 0.254 +0.127 Dy 0.991 +0.254 _srcs +0.000 40,305 BR Ww 8.001 0.102 8 MA AXIAA 7 GQLOLXVWGLOLXVWNMAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers Package Information 0.20 S SYMBOL | MIN MAX 8 : A 0.90 145 b i > L Al 0.00 0.15 e = AP 0.90 1.30 7 < tA 0 0.35 0.50 Cc 0.08 0.20 OD 2.80 3.00 | | E 2.60 3.00 El 1.50 73 L 0.g5 0.95 oF - - - E Ge Ej @ 0.95 REF el L930 REF Q OF 10? | |<] +! He - D C NOTE: G 1, ALL DIMENSIONS ARE IN MILLIMETERS. As FOOT LENGTH MEASURED AT INTERCEPT POINT BETWEEN ; DATUM A & LEAD SURFACE, A A&2 3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH & METAL | BURR, { ' 4, PACKAGE OUTLINE INCLUSIVE OF SOLDER PLATING. od Al MVAXI/VI PROPRIETARY INFORMATION: PACKAGE OUTLINE, SOT@3, SL APAROVAL DOCUMENT CONTROL AO REV l 1-057 BIA Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. Ne circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 1998 Maxim Integrated Products Printed USA AAAXLAA js a registered trademark of Maxim Integrated Products.