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LK112

Low noise and low drop voltage regulator with shutdown function

STMicroelectronics 

LK112

Low noise and low drop voltage regulator with shutdown function

Datasheet - production data

• Internal current and thermal limit

• Operative input voltage from:

– VOUT + 0.5 to 14 V (for VOUT > 2 V) or from

2.5 V to 14 V (for VOUT < 2 V)

Description

SOT23-5L

Features

• Output current up to 150 mA

• Low-dropout voltage (350 mV at IOUT = 150

mA)

• Very low quiescent current:

– 0.1 µA in OFF mode and max. 250 µA in

ON mode at IOUT = 0 mA

• Low output noise:

– typ. 30 µV at IOUT = 60 mA and 10 Hz < f <

80 kHz

The LK112 is a low-dropout linear regulator with a

built-in electronic switch. The internal switch can

be controlled by TTL or CMOS logic levels. The

device is on-state when the control pin is pulled to

a logic high level. An external capacitor can be

connected to the noise bypass pin to reduce the

output noise level to 30 µVrms. An internal PNP

pass transistor is used to achieve a low-dropout

voltage. The LK112 has a very low quiescent

current in on mode while in off mode Iq is reduced

below 100 nA max. The internal thermal

shutdown circuitry limits the junction temperature

below 150 °C. Load current is internally monitored

and the device shuts down in the presence of a

short-circuit or overcurrent condition on the

output.

• Wide range of output voltages

Table 1. Device summary

Order codes

Output voltages

LK112M15TR

LK112M18TR

LK112M25TR

LK112M33TR

1.5V

1.8V

2.5V

3.3V

LK112M50TR

5.0V

LK112M55TR

LK112M60TR

5.5V

6.0V

LK112M80TR

8.0V

April 2014

This is information on a product in full production.

DocID7362 Rev 17

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