UNISONIC TECHNOLOGIES CO., LTD

LD1985

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2005 Unisonic Technologies Co., Ltd

QW-R102-021,C

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 with

ultra low drop voltage and the low quiescent current. It is specially

designed for low noise, low power applications and in battery

powered systems, such as Cell phones, palmtop laptop computer,

PDAs, DSC.

The quiescent current in sleep mode is less than 1µA when

INHIBIT pin is pulled low. Due to Shutdown Logic Control Function

is available on pin 3 (TTL compatible), 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 Besides, an external

could reduce the noise to 30µVrms.

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, 5.0V

*Internal current and thermal limit

*± 1% tolerance version is available.(at 25℃)

*Low output noise voltage 30µVrms

SOT-25

4

5

3

2

1

*Pb-free plating product number: LD1985L

ORDERING INFORMATION

Order Number

Normal

Lead Free Plating

Package

Packing

LD1985-xx-AF5-R

LD1985L-xx-AF5-R

SOT-25

Tape Reel

Note: xx: Output Voltage, refer to Marking Information.

LD1985L-xx-AF5-R

(1)Packing Type

(2)Package Type

(3)Output Voltage Code

(4)Lead Plating

(1) R: Tape Reel

(2) AF5: SOT-25

(3) xx: refer to Marking Information

(4) L: Lead Free Plating, Blank: Pb/Sn