LD1085_07 Datasheet, PDF (1/27 Pages) STMicroelectronics – 3A Low drop positive voltage regulator adjustable and fixed

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
Schematic diagram
TO-220
TO-220FP
DPAK
D²PAK
D²PAK/A
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.
June 2007
Rev. 18
1/27
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