150mA ADJUSTABLE
VOLTAGE REGULATOR
March 17, 1998
LP2951A
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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.
FEATURES
鈥?
Guaranteed 150mA current
鈥?
Adjustable output voltage - 1.24V to 29V
鈥?
Accurate 5V output @150mA
鈥?
Low dropout voltage - 450mV @ 150mA
鈥?
Regulator or reference functions
鈥?
Direct replacement for LP2951AC, MIC2951-02,
AS2951AC
APPLICATIONS
鈥?
Microcontroller supplies
鈥?
Linear regulators
鈥?
Adjustable supplies
鈥?
Switching power supplies - post-regulation
鈥?
Portable modems
鈥?
Battery powered systems
鈥?
Cellular telephones
鈥?
Voltage references
ORDERING INFORMATION
DEVICE
LP2951ACM
(1)
BLOCK DIAGRAM
V
OUT
VOLTS
ADJ
PACKAGE
SO-8
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Shutdown Input
Voltage
Symbol
V
IN
Maximum
-0.3 to 30
-0.3 to 30
-0.3 to 30
P
D
T
J
T
STG
T
LEAD
Internally
Limited
-40 to 125
-65 to 150
260
Units
V
V
V
W
擄C
擄C
擄C
PIN CONFIGURATION
Error Comp. Output
Voltage
Power Dissipation
Operating Junction
Temperature Range
Storage
Temperature Range
Lead Temperature
(Soldering) 5 Sec
1
漏 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SEMTECH
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