LD1085XX_08 Datasheet, PDF (1/28 Pages) STMicroelectronics – 3 A low drop positive voltage regulator adjustable and fixed

LD1085xx
3 A low drop positive voltage regulator adjustable and fixed
Features
■ Typical dropout 1.3 V (at 3 A)
■ Three terminal adjustable or fixed output
voltage 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V, 12 V.
■ Automotive Grade product: adjustable V_OUT
only in TO-220 Full Pack package
■ Guaranteed output current up to 3 A
■ 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 LD1085xx is a low drop voltage regulator
able to provide up to 3 A of output current.
Dropout is guaranteed at a maximum of 1.2 V at
the maximum output current, decreasing at lower
loads. The LD1085xx is pin to pin compatible with
the older 3-terminal adjustable regulators, but has
better performances in term of drop and output
tolerance.
A 2.85 V 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 LD1085xx quiescent current flows
TO-220
TO-220FP
DPAK
D²PAK
D²PAK/A
into the load, so increase efficiency. Only a 10 µF
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.
The LD1085xx is available as Automotive Grade
in TO-220FP package only, for the option of
adjustable output voltage whose commercial part
number is shown in the Table 11 (order codes).
This device is qualified according to the
specification AEC-Q100 of the Automotive
market, in the temperature range -40 °C to
125 °C, and the statistical tests PAT, SYL, SBL are
performed.
Table 1. Device summary
February 2008
LD1085XX
LD1085XX15
LD1085XX18
Part numbers
Rev 21
LD1085XX25
LD1085XX33
LD1085XX50
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