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L4955V51

Description
5A ULDO LINEAR REGULATORS FAMILY
File Size134KB,14 Pages
ManufacturerSTMicroelectronics
Websitehttp://www.st.com/
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L4955V51 Overview

5A ULDO LINEAR REGULATORS FAMILY

®
L4955
5A ULDO LINEAR REGULATORS FAMILY
UP TO 5A OUTPUT CURRENT
±
2% PRECISE OUTPUT VOLTAGES
FAST TRANSIENT RESPONSE
0.75V TYP. DROP OUT VOLTAGE AT 5A
OPERATING INPUT VOLTAGE FROM 4.5V
ADJUSTABLE VERSION:
V
O
= 1.26V
INHIBIT (I
Q
= 120µA TYP.)
POWER GOOD
PROGRAMMABLE CURRENT LIMIT
HEPTAWATT PACKAGE
FIXED VERSION:
3.3V, 5.1V OUTPUTS
VERSAWATT PACKAGE
VERY LOW QUIESCENT CURRENT
SHORT CIRCUIT PROTECTION (Foldback
function)
THERMAL SHUTDOWN
APPLICATIONS
PENTIUM
AND POWER PC
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
of R
DSON
.
It operates from a 4.5V minimum supply, with a
very low quiescent current irrespective of the
load; a minimum of 22µF 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.
L4955
C1
CL
2
4
V
IN
C1
IN
1
L4955VXXX
2
GND
3
OUT
V
OUT
C2
D97IN590
D97IN589
February 1999
1/14

L4955V51 Related Products

L4955V51 L4955V33 L4955V5.1 L4955 L4955V3.3
Description 5A ULDO LINEAR REGULATORS FAMILY 5A ULDO LINEAR REGULATORS FAMILY 5A ULDO LINEAR REGULATORS FAMILY 5A ULDO LINEAR REGULATORS FAMILY 5A ULDO LINEAR REGULATORS FAMILY
Is it Rohs certified? - - incompatible incompatible incompatible
Maker - - STMicroelectronics STMicroelectronics STMicroelectronics
Parts packaging code - - SFM ZFM SFM
package instruction - - , SIP3,.1TB HEPTAWATT-7 , SIP3,.1TB
Contacts - - 3 7 3
Reach Compliance Code - - unknow _compli unknow
Adjustability - - FIXED ADJUSTABLE FIXED
Maximum drop-back voltage 1 - - 1.5 V 1.5 V 1.5 V
Nominal dropback voltage 1 - - 1.5 V 1.5 V 1.5 V
JESD-30 code - - R-PSFM-T3 R-PZFM-T7 R-PSFM-T3
JESD-609 code - - e0 e0 e0
Number of functions - - 1 1 1
Output times - - 1 1 1
Number of terminals - - 3 7 3
Working temperatureTJ-Max - - 125 °C 125 °C 125 °C
Maximum output current 1 - - 5 A 5 A 5 A
Maximum output voltage 1 - - 5.25 V 1.298 V 3.399 V
Minimum output voltage 1 - - 4.95 V 1.222 V 3.201 V
Package body material - - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
Encapsulate equivalent code - - SIP3,.1TB ZIP7,.2,.1TB SIP3,.1TB
Package shape - - RECTANGULAR RECTANGULAR RECTANGULAR
Package form - - FLANGE MOUNT FLANGE MOUNT FLANGE MOUNT
Peak Reflow Temperature (Celsius) - - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
Certification status - - Not Qualified Not Qualified Not Qualified
Regulator type - - FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR ADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
surface mount - - NO NO NO
technology - - BCD BCD BCD
Terminal surface - - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - - THROUGH-HOLE THROUGH-HOLE THROUGH-HOLE
Terminal pitch - - 2.54 mm 1.27 mm 2.54 mm
Terminal location - - SINGLE ZIG-ZAG SINGLE
Maximum time at peak reflow temperature - - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
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