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S-1122

HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR

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S-1112/1122 Series

www.sii-ic.com © Seiko Instruments Inc., 2002-2015

HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00

The S-1112/1122 Series is a positive voltage regulator with a low dropout voltage, high-accuracy output voltage, 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 protection circuit prevents the load current from exceeding the current capacity of the output transistor. An ON/OFF circuit ensures a long battery life. Compared with the voltage regulators using the conventional CMOS technology, a larger variety of capacitors are available, including small ceramic capacitors. Small SNT-6A(H) (S-1112 Series only) and SOT-23-5 packages realize high-density mounting. In SOT-23-5, the lineup includes the S-1112 and S-1122 Series, which differ in pin configuration.

 Features
• Output voltage: • Output voltage accuracy: • Dropout voltage: • Current consumption:
• Output current: • Output capacitor: • Ripple rejection: • Built-in overcurrent protection circuit: • Built-in ON/OFF circuit: • Operation temperature range: • Lead-free, Sn 100%, halogen-free*2

1.5 V to 5.5 V, selectable in 0.1 V step
±1.0% 190 mV typ. (3.0 V output product, IOUT = 100 mA) During operation: 50 μA typ., 90 μA max. During power-off: 0.1 μA typ., 1.0 μA max. Possible to output 150 mA (VIN ≥ VOUT(S) + 1.0 V)*1 A ceramic capacitor of 0.47 μF or more can be used. 80 dB typ. (f = 1.0 kHz)
Limits overcurrent of output transistor.
Ensures long battery life.
Ta = −40°C to +85°C

*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 personal communication device • Constant-voltage power supply for home electric/electronic appliance • Constant-voltage power supply for cellular phone
 Packages
• SNT-6A(H) • SOT-23-5

Seiko Instruments Inc.

1

HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR

S-1112/1122 Series

Rev.6.1_00

 Block Diagram
VIN

*1
VOUT

Overcurrent protection circuit

ON/OFF

ON/OFF circuit

+ −

Reference voltage circuit

VSS *1. Parasitic diode

Figure 1

2 Seiko Instruments Inc.

HIGH RIPPLE-REJECTION AND LOW DROPOUT CMO


























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