The S-T111 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 builtin overcurrent protector prevents the load current from exceeding the current capacitance of the output transistor.
An ON/OFF circuit ensures a long battery life.
Compared with the voltage regulators using the conventional CMOS process, a larger variety of capacitors are available, including small ceramic capacitors.
A small SOT-23-5 package realizes highdensity mounting.

• Output voltage: 1.5 V to 5.5 V, selectable in 0.1 V steps.
• High-accuracy output voltage: ±1.0%
• Low dropout voltage: 190 mV typ. (3.0 V output product, IOUT = 100 mA)
• Low current consumption: During operation: 50 μA typ., 90 μA max.
                                        During shutdown: 0.1 μA typ., 1.0 μA max.
• High peak current capability: 150 mA output is possible (at VIN ≥ VOUT(S) + 1.0 V)*1
• Built-in ON/OFF circuit: Ensures long battery life.
• Low ESR capacitor can be used: A ceramic capacitor of 0.1 μF or more can be used for the output capacitor.
• High ripple rejection: 80 dB typ. (at 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.

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

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