L4955V3.3 STMicroelectronics, L4955V3.3 Datasheet
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L4955V3.3
Manufacturer Part Number
L4955V3.3
Description
5A ULDO LINEAR REGULATORS FAMILY
Manufacturer
STMicroelectronics
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Part Number:
L4955V3.3
Manufacturer:
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Quantity:
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APPLICATIONS
DESCRIPTION
The L4955 is a family of monolithic ultra very low
drop linear regulators designed to supply the
most recent microprocessors.
TYPICAL APPLICATIONS
February 1999
V
IN
function)
CONVERSION
STANDBY FEATURE
UP TO 5A OUTPUT CURRENT
FAST TRANSIENT RESPONSE
0.75V TYP. DROP OUT VOLTAGE AT 5A
OPERATING INPUT VOLTAGE FROM 4.5V
ADJUSTABLE VERSION:
FIXED VERSION:
VERY LOW QUIESCENT CURRENT
SHORT CIRCUIT PROTECTION (Foldback
THERMAL SHUTDOWN
PENTIUM
POST REGULATOR FOR SMPS
LOW COST SOLUTION FOR 5V TO 3.3V
LOW COST BATTERY CHARGER
CONSTANT CURRENT REGULATOR
SUITABLE
2% PRECISE OUTPUT VOLTAGES
V
INHIBIT (I
POWER GOOD
PROGRAMMABLE CURRENT LIMIT
HEPTAWATT PACKAGE
3.3V, 5.1V OUTPUTS
VERSAWATT PACKAGE
C1
O
= 1.26V
IN
Q
1
CL
AND POWER PC
= 120 A TYP.)
FOR
INH
3
2
L4955
4
PG
6
GND
APPLICATION
7
5
OUT
ADJ
5A ULDO LINEAR REGULATORS FAMILY
SUPPLIES
D97IN589
R1
R2
C2
WITH
V
OUT
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 of R
It operates from a 4.5V minimum supply, with a
very low quiescent current irrespective of the
load; a minimum of 22 F output capacitor is re-
quired for stability.
The on-chip trimming techniques improve the pre-
cision of the available output voltages to 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.
V
L4955
L4955V3.3
L4955V5.1
IN
ORDERING
NUMBERS
C1
MULTIPOWER BCD TECHNOLOGY
HEPTAWATT
IN
1
L4955VXXX
VOLTAGE
1.26V ADJ
OUTPUT
3.3V
5.1V
2
GND
3
D97IN590
HEPTAWATT
VERSAWATT
VERSAWATT
VERSAWATT
OUT
PACKAGE
L4955
(TO-220)
DSON
C2
.
V
OUT
1/14