ULDO linear regulator 1.5V, 1.8V, 2.5V 3.3V fixed output voltage

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

ULDO linear regulator 1.5V, 1.8V, 2.5V 3.3V fixed output voltage

Datasheet Thumbnail

Top Searches for this datasheet

L4957A
ULDO linear regulator
1.5V, 1.8V, 2.5V 3.3V fixed output voltage input voltage range 200m RDS(on) typical 125°C 0.6V max. drop-out Excellent load regulation 0.6mA quiescent current load Short circuit protection Thermal shutdown
D2PAK
Description
Applications
L4957AD devices Ultra Drop Output linear regulators with internal N-channel MOSFET 200m particulary suitable voltage/low dropout applications. Operating with input voltage from they capable deliver
Mother boards Processor supplies voltage memory chip supplies Graphic sound cards voltage logic supplies Post regulator SMPS
devices ideal suppliesrequired processor, example they cost effective efficient solution conversion from 3.3V (rail bus) 2.5V 2.5A 1.5V with high current rating. Fast response transient minimise output capacitor value. minimum 22µF assures stability load conditions. on-chip trimming technique offers tighter voltage reference tolerance (with including line load variation) beside ensure controlled short circuit current. Thermal shutdown provides protection against overload conditions that creates excessive junction temperature.
Order codes
Part number Tube L4957AD1.5 L4957AD1.8 L4957AD2.5 L4957AD3.3 April 2006 Tape Reel L4957AD1.5TR L4957AD1.8TR L4957AD2.5TR L4957AD3.3TR 1/12
www.st.com
Contents
L4957A
Contents
Block diagram typical application description
connection description
Maximum ratings
Absolute maximum ratings Thermal data
Electrical characteristics Package mechanical data Revision history
2/12
L4957A
Block diagram typical application
Block diagram typical application
Figure Block diagram
10µF
CHARGE PUMP
VREF
CURRENT LIMIT
REGULATOR
BUFFER
POWER DMOS 200m VOUT 22µF
THERMAL SHUTDOWN
Figure
Typical application
L4957AD
VOUT
D00IN1108A
D00IN1107B
3/12
description
L4957A
description
connection
Figure connection (top view)
D98IN933A
D2PAK
description
Table description
Name
Description
Unregulated input voltage; this must bypassed with capacitor larger than 10µF. connect Ground 1.5V, 1.8V, 2.5V 3.3V output. Regulated output voltage. minimum bypass capacitor 22µF required insure stability.
4/12
L4957A
Maximum ratings
Maximum ratings
Absolute maximum ratings
Table Absolute maximum ratings
Symbol TSTG Supply input voltage Junction temperature Storage temperature Parameter Value +150 +150 Unit
Thermal data
Table Thermal data
Symbol RthJC RthJA Parameter Maximum thermal resistance junction-case Maximum thermal resistance junction-ambient Thermal Shutdown Thermal Hysteresis Value
Typ. Typ.
Unit
°C/W °C/W
5/12
Electrical characteristics
L4957A
Electrical characteristics
Table Electrical Characteristcs 25°C, unless otherwise specified)
Symbol Parameter Operating Supply Voltage Output Voltage 3.15V 5.25V; 0.1A 3.3V ±5%; 0.1A 3.3V 0.1A 3.3V (0.1A 4.5A) 0.1A 3.3V 0.1A 3.3V (0.1A 2.2A) 0.1A 0.1A 0.1A RDS(on) Drain-Source Resistance Current Limiting Quiescent Current Ripple Rejection
Test condition
1.485 1.47 1.782
Unit
1.515 1.53 1.818
1.764
1.836
2.475
2.525
Specifications referred from +125°C.
VIN<
120Hz,
3.267 3.234
2.45
2.55
3.333 3.366
6/12
L4957A
Electrical characteristics
Figure
Line regulation junction temperature
Figure
Load regulation
Figure
Maximum output current junction temperature
Figure
operating area
issip
7/12
Electrical characteristics Figure Ripple rejection frequency Figure
L4957A Output voltage output current (VOUT 1.5V)
D00IN1109
VOUT
IOUT(A)
Figure Maximum output current junction temperature
125°C 100°C
8/12
L4957A
Package mechanical data
Package mechanical data
order meet environmental requirements, offers these devices ECOPACK® packages. These packages have Lead-free second level interconnect category second level interconnect marked package inner label, compliance with JEDEC Standard JESD97. maximum ratings related soldering conditions also marked inner label. ECOPACK trademark. ECOPACK specifications available www.st.com
9/12
Package mechanical data Table 2PAK Mechanical data
Dim. 4.30 2.49 0.03 0.70 1.25 0.45 1.21 8.95 10.00 4.88 15.00 1.27 1.40 0.40 1.40 0.60 1.36 9.35 10.28 5.28 15.85 1.40 1.75 4.60 2.69 0.23 0.93 0.169 0.098 0.001 0.027 0.049 0.017 0.047 0.352 0.393 0.192 0.590 0.050 0.055 0.055 inch
L4957A
0.181 0.106 0.009 0.037
0.024 0.054 0.368 0.405
Figure Package dimensions
0.016
0.208 0.624 0.055 0.069
10/12
L4957A
Revision history
Revision history
Table Revision history
Date 12-Feb-2002 20-Apr-2006 Revision Changes Removed L4957AV part number references whole document template
11/12
L4957A
Please Read Carefully:
Information this document provided solely connection with products. STMicroelectronics subsidiaries ("ST") reserve right make changes, corrections, modifications improvements, this document, products services described herein time, without notice. products sold pursuant ST's terms conditions sale.
Purchasers solely responsible choice, selection products services described herein, assumes liability whatsoever relating choice, selection products services described herein. license, express implied, estoppel otherwise, intellectual property rights granted under this document. part this document refers third party products services shall deemed license grant such third party products services, intellectual property contained therein considered warranty covering manner whatsoever such third party products services intellectual property contained therein.
UNLESS OTHERWISE FORTH ST'S TERMS CONDITIONS SALE DISCLAIMS EXPRESS IMPLIED WARRANTY WITH RESPECT AND/OR SALE PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES MERCHANTABILITY, FITNESS PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER LAWS JURISDICTION), INFRINGEMENT PATENT, COPYRIGHT OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED WRITING AUTHORIZE REPRESENTATIVE PRODUCTS DESIGNED, AUTHORIZED WARRANTED MILITARY, CRAFT, SPACE, LIFE SAVING, LIFE SUSTAINING APPLICATIONS, PRODUCTS SYSTEMS, WHERE FAILURE MALFUNCTION RESULT PERSONAL INJURY, DEATH, SEVERE PROPERTY ENVIRONMENTAL DAMAGE.
Resale products with provisions different from statements and/or technical features forth this document shall immediately void warranty granted product service described herein shall create extend manner whatsoever, liability
logo registered trademark STMicroelectronics. other names property their respective owners.
logo trademarks registered trademarks various countries.
Information this document supersedes replaces information previously supplied.
2006 STMicroelectronics rights reserved STMicroelectronics group companies
Australia Belgium Brazil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom United States America www.st.com
12/12

ULDO linear regulator 1.5V, 1.8V, 2.5V 3.3V fixed output voltage

Top Searches for this datasheet

Other recent searches