POWER MANAGEMENT
Description
The LP2951 low power voltage regulator has low
quiescent current and low dropout voltage. The
quiescent current increases minimally during dropout
conditions thereby extending battery life. Refer to the
LP2951A data sheet for a 150mA version with tighter
regulation.
Available in the 8 lead SOIC package, the LP2951
includes features such as shutdown and low output
voltage detect (typically due to low battery conditions).
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 regulator
or adjusted between 1.24 volts and 29 volts using
external resistor pairs.
.ixed 5.0V or Adjustable
100mA Voltage Regulator
.eatures
K
K
K
K
K
K
K
Guaranteed 100mA current
Adjustable output voltage - 1.24V to 29V
Accurate 5V output
Low dropout voltage - 380mV @ 100mA
Regulator or reference functions
.ull industrial temperature range
SO-8 package
LP2951
Applications
K
K
K
K
K
K
K
K
Microcontroller supplies
Linear regulators
Adjustable Supplies
Switching power supplies - post-regulation
Portable modems
Battery powered systems
Cellular telephones
Voltage references
Typical Application Circuits
C1
10nF
R1
U1
VOUT = 1.24V to 30V
1
2
SHUTDOWN INPUT
3
4
OUT
LP2951
IN
FB
TAP
ERRORB
R3
8
7
6
5
ERROR OUTPUT
R2
VIN
SENSE
SHDN
GND
R1
錚?/div>
錚?/div>
V
OUT
=
V
REF
錚?/div>
1
+
錚?/div>
R2
錚?/div>
錚?/div>
+
C2
3.3uF
100k
U1
VOUT = 5V
1
2
SHUTDOWN INPUT
3
4
+
C1
3.3uF
OUT
LP2951
IN
FB
TAP
ERRORB
R1
8
7
6
5
ERROR OUTPUT
VIN
SENSE
SHDN
GND
100k
Revision 2, August 2001
1
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