L4957D1.5 STMicroelectronics, L4957D1.5 Datasheet

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L4957D1.5

Manufacturer Part Number
L4957D1.5
Description
UP TO 4A ULDO LINEAR REGULATOR
Manufacturer
STMicroelectronics
Datasheet
1.L4957D1.5.pdf (7 pages)

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
BOSTOCK HK LIMITED BOSTOCK HK LIMITED
Part Number:
L4957D1.5
Manufacturer:
ST
0
APPLICATIONS
DESCRIPTION
The L4957 devices are Ultra Low Drop Output lin-
ear regulators with an internal N-channel MOS of
200m
dropout applications.
Operating with a input voltage from 3V to 6.5V
they are capable to deliver up to 4A at 1.5V or
2.5V fixed output voltages.
TYPICAL APPLICATION
February 2000
BACK
PLIES
1.5V AND 2.5V FIXED OUTPUT VOLTAGE
3V TO 6.5V INPUT VOLTAGE RANGE
200m Rdson TYPICAL @ T
0.6V max. DROP-OUT AT 2A
EXCELLENT LOAD REGULATION
0.6mA QUIESCENT CURRENT AT ANY LOAD
SHORT CIRCUIT PROTECTION WITH FOLD-
THERMAL SHUTDOWN
MOTHER BOARDS
PROCESSOR I/O & SUPPLIES
LOW VOLTAGE MEMORY & CHIP SET SUP-
GRAPHIC & SOUND CARDS
LOW VOLTAGE LOGIC SUPPLIES
POST REGULATOR FOR SMPS
particulary suitable for low voltage/low
3V to 6.5V
C1
j
= 125 C
IN
UP TO 4A ULDO LINEAR REGULATOR
1
L4957
2
GND
The devices are ideal for use as one of the sup-
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 F assures the
stability in all load conditions.
The on-chip trimming technique offers a tighter
voltage reference tolerance (with
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.
3
OUT
Versawatt TO-220
MULTIPOWER BCD TECHNOLOGY
L4957V1.5
L4957V2.5
D97IN657E
ORDERING NUMBERS:
V
OUT
C2
=1.5V/2.5V
L4957D1.5
L4957D2.5
D
2
2% including
L4957
PAK
1
3
1/7

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L4957D1.5 Summary of contents

Page 1

... Thermal shutdown provides protection against overload conditions that creates excessive junction temperature. V =1.5V/2.5V OUT OUT 1 3 L4957 C2 2 GND D97IN657E L4957 PAK L4957D1.5 L4957D2.5 2% including 1/7 ...

Page 2

L4957 ABSOLUTE MAXIMUM RATINGS Symbol V Supply Input Voltage IN T Junction Temperature i T Storage Temperature stg PINS CONNECTION D98IN838B Versawatt (TO220) BLOCK DIAGRAM REF PRE REGULATOR 2/7 Parameter ...

Page 3

PIN FUNCTIONS Pin N Name 1 IN Unregulated input voltage; this pin must be bypassed with a capacitor larger than GND To connect to Ground to get 1.5V or 2.5V output. 3 OUT Regulated output voltage. A ...

Page 4

L4957 Figure 3: Maximum Output Current vs. Junction Temperature O utput C urrent [ (Vin-Vout) > pin -40 - ...

Page 5

DIM. MIN. TYP. MAX. MIN. TYP. A 4.40 4.60 0.173 C 1.23 1.32 0.048 D 2.40 2.72 0.094 E 0.49 0.70 0.019 F 0.61 0.88 0.024 F1 1.14 1.70 0.044 F2 1.14 1.70 0.044 G 4.95 5.15 0.194 ...

Page 6

L4957 DIMENSIONS REF. Millimeters Inches Min. Typ. Max. Min. A 4.30 4.60 0.169 A1 2.49 2.69 0.098 A2 0.03 0.23 0.001 B 0.70 0.93 0.027 B2 1.25 1.40 0.049 0.055 C 0.45 0.60 0.017 C2 1.21 1.36 0.047 D 8.95 ...

Page 7

... STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics – ...

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