UTCLD1985

LINEAR INTEGRATED CIRCUIT

1

QW-R102-021,B

VERY LOW DROP AND LOW

NOISE VOLTAGE REGULATOR

LOW ESR CAP. COMPATIBLE,

WITH INHIBIT FUNCTION

DESCRIPTION

The UTC LD1985 is a 150mA fixed output voltage

regulator. The ultra low drop voltage and the low

quiescent current make them particularly suitable for low

noise, low power applications, and in battery powered

systems. In sleep mode quiescent current is less than

1μA when INHIBIT pin is pulled low. Shutdown Logic

Control Function is available on pin 3 (TTL compatible).

This means that when the device is used as local

regulator, it is possible to put a part of the board in

standby, decreasing the total power consumption.

bypass pin and GND reduce the noise to 30μVrms.

Typical application are in cellular phone, palmtop

laptop computer, personal digital assistant (PDA),

personal stereo, camcorder and camera.

FEATURES

*VERY LOW DROPOUT VOLTAGE (280mV at 150mA

AND 7mV at 1mA LOAD)

*VERY LOW QUIESCENT CURRENT (2mA Typ. at

150mA LOAD AND 80μA at NO LOAD)

*OUTPUT CURRENT UP TO 150mA

*LOGIC CONTROLLED ELECTRONIC SHUTDOWN

*OUTPUT VOLTAGE OF 1.5, 1.8, 2.5, 2.8, 2.85, 3, 3.1,

3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V

*INTERNAL CURRENT AND THERMAL LIMIT

*AVAILABLE IN ± 1% TOLLERANCE (at 25℃, A

VERSION)

*LOW OUTPUT NOISE VOLTAGE 30μVrms

SOT-25

1

2

3

4

5

2:GND

3:INHIBIT

4:Bypass

PIN DESCRIPTION

PIN

NO.

PIN

NAME

FUNCTION

1

IN

Input Port

2

GND Ground Pin

3

INHIBIT

Control switch ON/OFF.

Inhibit is not internally

pulled-up; it cannot be left

floating. Disable the device

when connected to GND or

to a positive voltage less

than 0.18V

4

Bypass

Bypass Pin: Capacitor to

be connected to GND in

order to improve the

thermal noise

performances.

5

OUT

Output Port