S-1721 Series SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR www.sii-ic.com SII Semiconductor Corporation, 2007-2015 Rev.2.1 01 The S-1721 Series, developed using the CMOS technology, is a 2-channel positive voltage regulator IC which has the low dropout voltage, the high-accuracy output voltage and the low output current consumption of 150 mA. Users are able to use a small ceramic capacitor of 1.0 F for this IC. This IC includes two regulator circuits in the package SOT-23-6 or super-small SNT-6A. S-1721 Series has much lower current consumption than the S-1711 Series, this IC is ideal for mobile devices. Features Output voltage: 1.2 V to 5.0 V, selectable in 0.05 V step Input voltage: 1.7 V to 6.5 V Output voltage accuracy: 1.0% Dropout voltage: 130 mV typ. (3.0 V output product, IOUT = 100 mA) Current consumption: During operation: 25 A typ., 45 A max. (3.0 V output product, per circuit) During power-off: 0.1 A typ., 1.0 A max. *1 Output current: Possible to output 150 mA (VIN VOUT(S) + 1.0 V) (per circuit) Input and output capacitors: A ceramic capacitor of 1.0 F or more can be used. Ripple rejection: 80 dB typ. (products having the output under 1.8 V, f = 1.0 kHz) Built-in overcurrent protection circuit: Iimits overcurrent of output transistor. Built-in ON/OFF circuit: Ensures long battery life. Pull-up or pull-down resistor 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 cellular phone Constant-voltage power supply for battery-powered device Packages SNT-6A SOT-23-6 1 SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-1721 Series Rev.2.1 01 Block Diagrams 1. S-1721 Series A type *1 Function Status ON/OFF1 VOUT1 1ch Active H ON/OFF logic Overcurrent 2ch Active H protection circuit 1ch None Pull-up resistor 2ch None ON/OFF + 1ch Available circuit Pull-down resistor 2ch Available Reference voltage circuit *1 VIN VSS Overcurrent protection circuit ON/OFF + circuit Reference voltage circuit ON/OFF2 VOUT2 *1. Parasitic diode Figure 1 2. S-1721 Series B type *1 Function Status ON/OFF1 VOUT1 1ch Active H ON/OFF logic Overcurrent 2ch Active L protection circuit 1ch None Pull-up resistor 2ch Available ON/OFF + 1ch Available circuit Pull-down resistor 2ch None Reference voltage circuit *1 VIN VSS Overcurrent protection circuit ON/OFF + circuit Reference voltage circuit ON/OFF2 VOUT2 *1. Parasitic diode Figure 2 2