S-1137 Series 5.5 V INPUT, 300 mA VOLTAGE REGULATOR www.ablic.com WITH SOFT-START FUNCTION ABLIC Inc., 2009-2018 Rev.2.2 00 The S-1137 Series, developed using the CMOS technology, is a positive voltage regulator IC which has the low dropout voltage, the high-accuracy output voltage and the soft-start function (300 mA output current). A 1.0 F small ceramic capacitor can be used. It operates with low current consumption of 45 A typ. The overcurrent protection circuit prevents the load current from exceeding the current capacity of the output transistor. The ON / OFF circuit ensures longer battery life. Compared to the conventional CMOS technology regulator ICs, various capacitors including small ceramic capacitors can be used for this IC. Furthermore, small SOT-89-5, SOT-23-5, and SNT-6A(H) packages realize high-density mounting. Features Output voltage: 1.2 V to 3.5 V, selectable in 0.05 V step Input voltage: 1.7 V to 5.5 V Output voltage accuracy: 1.0% (1.2 V to 1.45 V output product : 15 mV) Dropout voltage: 210 mV typ. (2.8 V output product, I = 300 mA) OUT Current consumption: During operation: 45 A typ., 65 A max. During power-off: 0.1 A typ., 1.0 A max. *1 Output current: Possible to output 300 mA (V V + 1.0 V) IN OUT(S) Input and output capacitors: A ceramic capacitor of 1.0 F or more can be used. Ripple rejection: 70 dB typ. (f = 1.0 kHz) Built-in soft-start circuit: Soft-start time : 0.7 ms typ. (C = 1.0 nF) SS Built-in overcurrent protection circuit: Limits overcurrent of output transistor. Built-in ON / OFF circuit: Ensures long battery life. Discharge shunt function available / unavailable is selectable. Pull-down function available / unavailable is selectable. Operation temperature range: Ta = 40C to +85C *2 Lead-free, Sn 100%, halogen-free *1. Attention should be paid to the power dissipation of the package when the output current is large. *2. Refer to Product Name Structure for details. Applications Constant-voltage power supply for battery-powered device Constant-voltage power supply for cellular phone, portable device Constant-voltage power supply for digital still camera, TV, DVD recorder Packages SOT-89-5 SOT-23-5 SNT-6A(H) 1 5.5 V INPUT, 300 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION S-1137 Series Rev.2.2 00 Block Diagrams 1. S-1137 Series A type *1 Function Status ON / OFF logic Active H VIN VOUT Discharge shunt Available function Overcurrent Pull-down resistor Available protection circuit ON / OFF ON / OFF circuit + Soft-start SSC circuit Reference voltage circuit *1 *1 VSS *1. Parasitic diode Figure 1 2. S-1137 Series B type *1 Function Status ON / OFF logic Active H VIN VOUT Discharge shunt Available function Overcurrent Pull-down resistor Unavailable protection circuit ON / OFF ON / OFF circuit + Soft-start SSC circuit Reference voltage circuit *1 *1 VSS *1. Parasitic diode Figure 2 2