L4957AD18 STMICROELECTRONICS [STMicroelectronics], L4957AD18 Datasheet

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L4957AD18

Manufacturer Part Number
L4957AD18
Description
UP TO 5A ULDO LINEAR REGULATOR
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet

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Part Number:
L4957AD18TR
Manufacturer:
ST
0
May 2000
This is preliminary information on a new product now in development. Details are subject to change without notice.
APPLICATIONS
DESCRIPTION
The L4957A devices are Ultra Low Drop Output
linear regulators with an internal N-channel MOS
of 200m
dropout applications.
Operating with a input voltage from 3V to 14V
they are capable to deliver up to 5A.
The devices are ideal for use as one of the sup-
TYPICAL APPLICATION
1.5V, 1.8V, 2.5V AND 3.3V FIXED OUTPUT
VOLTAGE
3V TO 14V 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
THERMAL SHUTDOWN
MOTHER BOARDS
PROCESSOR I/O & SUPPLIES
LOW VOLTAGE MEMORY & CHIP SET SUP-
PLIES
GRAPHIC & SOUND CARDS
LOW VOLTAGE LOGIC SUPPLIES
POST REGULATOR FOR SMPS
particulary suitable for low voltage/low
3V to 14V
C1
j
= 125 C
IN
UP TO 5A ULDO LINEAR REGULATOR
1
L4957A
2
GND
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
Versawatt TO-220
MULTIPOWER BCD TECHNOLOGY
L4957AV1.5
L4957AV1.8
L4957AV2.5
L4957AV3.3
OUT
D00IN1107A
ORDERING NUMBERS:
V
C2
OUT
PRODUCT PREVIEW
L4957AD1.5
L4957AD1.8
L4957AD2.5
L4957AD3.3
L4957A
D
2
2% including
PAK
1
3
1/7

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L4957AD18 Summary of contents

Page 1

AND 3.3V FIXED OUTPUT VOLTAGE 3V TO 14V INPUT VOLTAGE RANGE 200m Rdson TYPICAL @ T = 125 C j 0.6V max. DROP-OUT AT 2A EXCELLENT LOAD REGULATION 0.6mA QUIESCENT CURRENT AT ANY LOAD SHORT CIRCUIT PROTECTION ...

Page 2

L4957A 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 PIN FUNCTIONS ...

Page 3

THERMAL DATA Symbol R Thermal Resistance Junction-case th j-case R Thermal Resistance Junction-ambient th j-amb Thermal Shutdown Thermal Hysteresis ELECTRICAL CHARACTERISTICS (T = Specifications referred to T from +125 C. J Symbol Parameter V Operating Supply Voltage ...

Page 4

L4957A 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

L4957A 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

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. ...

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