LD1085CDT-R datasheet(1/27 Pages) STMICROELECTRONICS

Part #	LD1085CDT-R

Description	3A Low drop positive voltage regulator adjustable and fixed

PDF	27 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 27 page

June 2007

Rev. 18

1/27

27

LD1085 series

3A Low drop positive voltage regulator adjustable and fixed

Features

■ Typical dropout 1.3V (at 3A)

■ Three terminal adjustable or fixed output

voltage 1.5V, 1.8V, 2.5V, 3.3V, 5V, 12V.

■ Guaranteed output current up to 3A

■ Output tolerance ±1% at 25°C and ±2% in full

temperature range

■ Internal power and thermal limit

■ Wide operating temperature range -40°C to

125°C

■ Package available: TO-220, TO-220FP,

DPAK, D2PAK, D2PAK/A

■ Pinout compatibility with standard adjustable

VREG

Description

The LD1085 is a LOW DROP Voltage Regulator

able to provide up to 3A of Output Current.

Dropout is guaranteed at a maximum of 1.2V at

the maximum output current, decreasing at lower

loads. The LD1085 is pin to pin compatible with

the older 3-terminal adjustable regulators, but has

better performances in term of drop and output

tolerance.

A 2.85V output version is suitable for SCSI-2

active termination. Unlike PNP regulators, where

a part of the output current is wasted as quiescent

current, the LD1085 quiescent current flows into

the load, so increase efficiency. Only a 10µF

minimum capacitor is need for stability.

The device is supplied in TO-220, TO-220FP,

DPAK, D2PAK and D2PAK/A. On chip trimming

allows the regulator to reach a very tight output

voltage tolerance, within ±1% at 25°C.

TO-220FP

D2PAK/A

TO-220

D2PAK

DPAK

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Schematic diagram

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