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L4955V5.1 Datasheet

  • L4955V5.1

  • 5A ULDO LINEAR REGULATORS FAMILY

  • 14頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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廬
L4955
5A ULDO LINEAR REGULATORS FAMILY
UP TO 5A OUTPUT CURRENT
鹵
2% PRECISE OUTPUT VOLTAGES
FAST TRANSIENT RESPONSE
0.75V TYP. DROP OUT VOLTAGE AT 5A
OPERATING INPUT VOLTAGE FROM 4.5V
ADJUSTABLE VERSION:
鈥?/div>
V
O
= 1.26V
鈥?/div>
INHIBIT (I
Q
= 120碌A(chǔ) TYP.)
鈥?/div>
POWER GOOD
鈥?/div>
PROGRAMMABLE CURRENT LIMIT
鈥?/div>
HEPTAWATT PACKAGE
FIXED VERSION:
鈥?/div>
3.3V, 5.1V OUTPUTS
鈥?/div>
VERSAWATT PACKAGE
VERY LOW QUIESCENT CURRENT
SHORT CIRCUIT PROTECTION (Foldback
function)
THERMAL SHUTDOWN
APPLICATIONS
PENTIUM
鈩?/div>
AND POWER PC
鈩?/div>
SUPPLIES
POST REGULATOR FOR SMPS
LOW COST SOLUTION FOR 5V TO 3.3V
CONVERSION
LOW COST BATTERY CHARGER
CONSTANT CURRENT REGULATOR
SUITABLE
FOR
APPLICATION WITH
STANDBY FEATURE
DESCRIPTION
The L4955 is a family of monolithic ultra very low
drop linear regulators designed to supply the
most recent microprocessors.
TYPICAL APPLICATIONS
INH
V
IN
IN
1
3
PG
6
7
OUT
R1
5
GND
ADJ
R2
C2
V
OUT
MULTIPOWER BCD TECHNOLOGY
HEPTAWATT
ORDERING
NUMBERS
L4955
L4955V3.3
L4955V5.1
OUTPUT
VOLTAGE
1.26V ADJ
3.3V
5.1V
VERSAWATT
(TO-220)
PACKAGE
HEPTAWATT
VERSAWATT
VERSAWATT
The dropout voltage is only 0.75V (Typ.) at 5A, di-
rectly dependent on the output current conditions.
Realized in BCDII technology, it has on board a
charge pump to properly drive an N-channel
power mos Transistor with 150m
鈩?/div>
of R
DSON
.
It operates from a 4.5V minimum supply, with a
very low quiescent current irrespective of the
load; a minimum of 22碌F output capacitor is re-
quired for stability.
The on-chip trimming techniques improve the pre-
cision of the available output voltages to
鹵
2%.
Ancillary functions like power good, inhibit with
low power consumption, programmable output
voltage and current limiting make the flexible
heptawatt version usable in applications where
power management, stand-by, features, post
regulation and adjustable current generators for
battery chargers are important.
L4955
C1
CL
2
4
V
IN
C1
IN
1
L4955VXXX
2
GND
3
OUT
V
OUT
C2
D97IN590
D97IN589
February 1999
1/14

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