L4957AD-3.3 Datasheet, PDF (1/12 Pages) STMicroelectronics – Up to 5A ULDO linear regulator

L4957A
Up to 5A ULDO linear regulator
General features
■ 1.5V, 1.8V, 2.5V and 3.3V fixed output voltage
■ 3V to 14V input voltage range
■ 200mΩ R_DS(on) typical @ t_J = 125°C
t(s) ^{■ 0.6V max. drop-out at 2A}
■ Excellent load regulation
uc _{■ 0.6mA quiescent current at any load}
rod ^{) ■ Short circuit protection}
P _t(s ^{■ Thermal shutdown}
lete ^{uc Applications}
so ^{rod ■ Mother boards}
b ^P _{■ Processor I/O & supplies}
- ^{O te ■ Low voltage memory & chip set supplies}
) ^le _{■ Graphic & sound cards}
t(s ^{so ■ Low voltage logic supplies}
c ^b _{■ Post regulator for SMPS}
O_O^b_b^s_s^o_o^l_l^e_e^t_t^ee ^{PPrroodduuct(s) - O} _{Order codes}
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D²PAK
Description
The L4957AD devices are Ultra Low Drop Output
linear regulators with an internal N-channel
MOSFET of 200mΩ particulary suitable for low
voltage/low dropout applications.
Operating with a input voltage from 3V to 14V
they are capable to deliver up to 5A.
The devices are ideal for use as one of the
suppliesrequired by processor, for example they
are the cost effective and efficient solution for
conversion from 3.3V (rail bus) to 2.5V @ 2.5A or
to 1.5V with high current rating.
Fast response transient minimise the output
capacitor value. A minimum of 22µF assures the
stability in all load conditions.
The on-chip trimming technique offers a tighter
voltage reference tolerance (with ± 2% including
line and load variation) beside to ensure a
controlled short circuit current. Thermal shutdown
provides protection against overload conditions
that creates excessive junction temperature.
Part number
April 2006
Tube
L4957AD1.5
L4957AD1.8
L4957AD2.5
L4957AD3.3
Rev 6
Tape and Reel
L4957AD1.5TR
L4957AD1.8TR
L4957AD2.5TR
L4957AD3.3TR
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