LP2951A Semtech Corporation, LP2951A Datasheet

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LP2951A

Manufacturer Part Number
LP2951A
Description
Manufacturer
Semtech Corporation
Datasheet

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March 17, 1998
DESCRIPTION
The LP2951A is an improved version of the LP2951
and features tighter tolerance on the output voltage
and reference voltage specifications. Both the LP2951
and LP2951A feature 150mA output current capability.
The LP2951 series of low power voltage regulators
have low quiescent current and low dropout voltage.
The quiescent current increases minimally during
dropout conditions thereby extending battery life.
Available in the eight lead SOIC package, the LP2951
series includes features such as shutdown and low
output voltage detect (typically due to low battery con-
ditions) . This function may also be used as a power on
reset function when triggered by CMOS or TTL inputs.
The circuit can be used as a fixed voltage 5 volt regula-
tor or adjusted between 1.24 volts and 29 volts using
external resistor pairs.
BLOCK DIAGRAM
PIN CONFIGURATION
© 1998 SEMTECH CORP.
150mA ADJUSTABLE
VOLTAGE REGULATOR
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
APPLICATIONS
ORDERING INFORMATION
LP2951ACM
Note:
(1) Add suffix ‘TR’ for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Shutdown Input
Voltage
Error Comp. Output
Voltage
Power Dissipation
Operating Junction
Temperature Range
Storage
Temperature Range
Lead Temperature
(Soldering) 5 Sec
=
=
=
=
=
=
=
=
=
=
=
=
=
=
652 MITCHELL ROAD NEWBURY PARK CA 91320
Guaranteed 150mA current
Adjustable output voltage - 1.24V to 29V
Accurate 5V output @150mA
Low dropout voltage - 450mV @ 150mA
Regulator or reference functions
Direct replacement for LP2951AC, MIC2951-02,
AS2951AC
Microcontroller supplies
Linear regulators
Adjustable supplies
Switching power supplies - post-regulation
Portable modems
Battery powered systems
Cellular telephones
Voltage references
DEVICE
(1)
Symbol
V
T
T
OUT
V
P
T
LEAD
STG
IN
D
ADJ
J
VOLTS
Maximum
-40 to 125
-65 to 150
-0.3 to 30
-0.3 to 30
-0.3 to 30
Internally
Limited
260
LP2951A
PACKAGE
SO-8
Units
°C
°C
°C
W
V
V
V
1

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LP2951A Summary of contents

Page 1

... March 17, 1998 DESCRIPTION The LP2951A is an improved version of the LP2951 and features tighter tolerance on the output voltage and reference voltage specifications. Both the LP2951 and LP2951A feature 150mA output current capability. The LP2951 series of low power voltage regulators have low quiescent current and low dropout voltage. ...

Page 2

... IN OL Upper Lower Low High V = 2.4V SHUTDOWN V = 30V SHUTDOWN V 2V, V 30V, SHUTDOWN Feedback pin to Tap 5V OUT 652 MITCHELL ROAD NEWBURY PARK CA 91320 LP2951A + 1V 100µ 1µF OUT(NOM Min Typ Max Units 4.975 5.000 5.025 V 20 120 ppm/°C 0.1 0.5 % ...

Page 3

... March 17, 1998 PRINCIPLES OF OPERATION (LP2951 AND LP2951A) Setting the Output Voltage The LP2951(A) can be set to deliver any output voltage from 1.24V to 30V by using an external voltage divider. In addition, an internal voltage divider is provided output is desired. To use the internal voltage di- vider, simply connect the sense pin to the output and the tap pin to the feedback pin (see block diagram) ...

Page 4

... March 17, 1998 PRINCIPLES OF OPERATION (LP2951 and LP2951A) (cont.) Reducing Output Noise In ultra-quiet systems, or when the LP2951(A) is being used as a reference, it may be desirable to perform additional output filtering to reduce noise. While this can be done simply using larger capacitors on the out- put, that solution tends to be bulky and expensive, and eventually, with huge capacitors (> ...

Page 5

... March 17, 1998 OUTLINE DRAWING SO-8 LAND PATTERN SO-8 © 1998 SEMTECH CORP. 150mA ADJUSTABLE VOLTAGE REGULATOR 652 MITCHELL ROAD NEWBURY PARK CA 91320 LP2951A 5 ...

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