LD1085 Datasheet, PDF (1/19 Pages) STMicroelectronics – 3A LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS

LD1085
SERIES
3A LOW DROP POSITIVE VOLTAGE
REGULATOR ADJUSTABLE AND FIXED
I TYPICAL DROPOUT 1.3V (AT 3A)
I THREE TERMINAL ADJUSTABLE OR FIXED
OUTPUT VOLTAGE 1.5V, 1.8V, 2.5V, 2.85V,
3.3V, 3.6V, 5V, 8V, 9V, 12V.
I GUARANTEED OUTPUT CURRENT UP TO
3A
I OUPUT TOLERANCE ±1% AT 25°C AND
±2% IN FULL TEMPERATURE RANGE
I INTERNAL POWER AND THERMAL LIMIT
I WIDE OPERATING TEMPERATURE RANGE
-40°C TO 125°C
I PACKAGE AVAILABLE: TO-220, TO-220FP
D²PAK, D²PAK/A
I 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.
TO-220
TO-220FP
D²PAK
D²PAK/A
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,
D²PAK and D²PAK/A. On chip trimming allows the
regulator to reach a very tight output voltage
tolerance, within ±1% at 25°C.
Figure 1: Schematic Diagram
March 2005
Rev. 14
1/19