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Overview - S-1111/1121 series

High Ripple-Rejection Low Dropout CMOS Voltage Regulator S-1111/1121 series

The S-1111/1121 Series is a positive voltage regulator with a low dropout voltage, high output voltage accuracy, and low current consumption developed based on CMOS technology.
A built-in low on-resistance transistor provides a low dropout voltage and large output current, and a built-in overcurrent protector prevents the load current from exceeding the current capacitance of the output transistor. An ON/OFF circuit ensures a long battery life, and small SOT-23-5 and 5-Pin SON(A) packages realize high-density mounting.
The lineup includes the S-1111 and S-1121 series, which differ in pin configuration.

DATA SHEET
2007.12.3

Features


    • Output voltage: 1.5 V to 5.5 V, selectable in 0.1 V steps.
    • High-accuracy output voltage: ±1.0%
    • Low dropout voltage: 200 mV typ. (3.0 V output product, Iout =100 mA)
    • Low current consumption: During operation 35 µA typ. 65 µA max., During shutdown 0.1 µA typ. 1.0 µA max.
    • High peak current capability: 150 mA output is possible (@ Vin >Vout(S) +1.0 V) *1
    • Built-in ON/OFF circuit: Ensures long battery life.
    • High ripple rejection: 70 dB typ. (@ 1.0 kHz)
    • Built-in overcurrent protector: Overcurrent of output transistor can be restricted.
    • Small package: SOT-23-5
    • Lead-free products

      *1. Attention should be paid to the power dissipation of the package when the output current is large.

Applications


    • Power supply for battery-powered devices
    • Power supply for personal communication devices
    • Power supply for home electric/electronic appliances
    • Power supply for cellular phones

Standard Circuit