LP2951 Datasheet, PDF (1/3 Pages) Semtech Corporation – 150mA ADJUSTABLE VOLTAGE REGULATOR

150mA ADJUSTABLE
VOLTAGE REGULATOR
LP2951
March 17, 1998
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DESCRIPTION
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 8 lead SOIC package, the LP2951 se-
ries includes features such as shutdown and low out-
put voltage detect (typically due to low battery condi-
tions). 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 (3.3
volt for LP2951CM-3.3) regulator or adjusted between
1.24 volts and 29 volts using external resistor pairs.
BLOCK DIAGRAM
FEATURES
•= Guaranteed 150mA current
•= Adjustable output voltage - 1.24V to 29V
•= Accurate 5V or 3.3V output @ 100mA
•= Low dropout voltage - 350-400mV @ 100mA
•= Regulator or reference functions
•= Direct replacement for LP2951C, MIC2951-03,
AS2951C
APPLICATIONS
•= Microcontroller supplies
•= Linear regulators
•= Adjustable Supplies
•= Switching power supplies - post-regulation
•= Portable modems
•= Battery powered systems
•= Cellular telephones
•= Voltage references
ORDERING INFORMATION
DEVICE⁽¹⁾⁽²⁾
OUTPUT
PACKAGE
LP2951CM-X.X
ADJ
SO-8
Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 3.3V (-3.3) and 5V (leave blank).
(2) Add suffix ‘TR’ for tape and reel.
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Maximum
Supply Voltage
V_IN
-0.3 to 30
Shutdown Input
Voltage
-0.3 to 30
Error Comp. Output
Voltage
-0.3 to 30
Power Dissipation
P_D
Internally
Limited
Thermal Resistance
Junction to Ambient
θ_JA
175
Operating Junction
Temperature Range
T_J
-40 to 125
Storage
Temperature Range
T_STG -65 to 150
Lead Temperature
(Soldering) 5 Sec
T_LEAD
260
Units
V
V
V
W
°C/W
°C
°C
°C
© 1998 SEMTECH CORP.
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