S-1172 Series HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR www.sii-ic.com SII Semiconductor Corporation, 2007-2015 Rev.2.2 02 The S-1172 Series, developed by using CMOS technology, is a positive voltage regulator with a super low dropout voltage, high-accuracy output voltage and low current consumption. The S-1172 Series provides the very low dropout voltage and the large output current due to the built-in transistor with low on-resistance. The S-1172 Series includes an overcurrent protection circuit that prevents the load current from exceeding the current capacitance of the output transistor, a thermal shutdown circuit that prevents damage due to overheating, and an inrush current limit circuit to limit the excessive inrush current generated at power-on. The ON/OFF circuit ensures longer battery life. Compared with the voltage regulators using the conventional CMOS technology, a large variety of capacitors are available, including small ceramic capacitors. High heat radiation HSOP-6 and small SOT-89-5 packages realize high-density mounting. Features Output voltage: 1.0 V to 5.0 V, selectable in 0.05 V step Input voltage: 1.5 V to 5.5 V Output voltage accuracy: 1.0% (1.0 V to 1.45 V output product: 15 mV) Dropout voltage: 70 mV typ. (3.0 V output product, I = 300 mA) OUT Current consumption: During operation: 70 A typ., 90 A max. (3.0 V output product) During power-off: 0.1 A typ., 1.0 A max. *1 Output current: Possible to output 1000 mA (3.0 V output product, VIN VOUT(S) + 1.0 V) Input and output capacitors: A ceramic capacitor of 4.7 F or more can be used. Ripple rejection: 70 dB typ. (1.0 V output product, f = 1.0 kHz) Built-in overcurrent protection circuit: Limits overcurrent of output transistor. Built-in thermal shutdown circuit: Prevents damage caused by heat. Built-in inrush current limit circuit: Limits excessive inrush current at power-on. Built-in ON/OFF circuit: Ensures Long battery life. 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 TV, notebook PC and home electric appliance Constant-voltage power supply for portable equipment Packages SOT-89-5 HSOP-6 1 HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1172 Series Rev.2.2 02 Block Diagram *1 VIN VOUT Overcurrent protection circuit Thermal shutdown circuit + ON/OFF circuit ON/OFF Reference voltage circuit VSS *1. Parasitic diode Figure 1 2