廬
L4957A
UP TO 5A ULDO LINEAR REGULATOR
PRODUCT PREVIEW
1.5V, 1.8V, 2.5V AND 3.3V FIXED OUTPUT
VOLTAGE
3V TO 14V INPUT VOLTAGE RANGE
200m鈩?Rdson TYPICAL @ T
j
= 125擄C
0.6V max. DROP-OUT AT 2A
EXCELLENT LOAD REGULATION
0.6mA QUIESCENT CURRENT AT ANY LOAD
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
APPLICATIONS
MOTHER BOARDS
PROCESSOR I/O & SUPPLIES
LOW VOLTAGE MEMORY & CHIP SET SUP-
PLIES
GRAPHIC & SOUND CARDS
LOW VOLTAGE LOGIC SUPPLIES
POST REGULATOR FOR SMPS
DESCRIPTION
The L4957A devices are
Ultra Low Drop Output
linear regulators with an internal N-channel MOS
of 200m鈩?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 sup-
MULTIPOWER BCD TECHNOLOGY
3
1
Versawatt TO-220
D
2
PAK
ORDERING NUMBERS:
L4957AV1.5
L4957AV1.8
L4957AV2.5
L4957AV3.3
L4957AD1.5
L4957AD1.8
L4957AD2.5
L4957AD3.3
plies required by processor, for example they are
the cost effective and efficient solution for conver-
sion from 3.3V (rail bus) to 2.5V @ 2.5A or to
1.5V with high current rating.
Fast response transient minimise the output ca-
pacitor value. A minimum of 22碌F assures the
stability in all load conditions.
The on-chip trimming technique offers a tighter
voltage reference tolerance (with
鹵
2% including
line and load variation) beside to ensure a con-
trolled short circuit current. Thermal shutdown
provides protection against overload conditions
that creates excessive junction temperature.
TYPICAL APPLICATION
3V to 14V
IN
1
3
OUT
V
OUT
L4957A
C1
2
GND
D00IN1107A
C2
May 2000
This is preliminary information on a new product now in development. Details are subject to change without notice.
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