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150mA ADJUSTABLE
VOLTAGE REGULATOR
LP2951
March 17, 1998
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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
VIN -0.3 to 30
Shutdown Input
Voltage
-0.3 to 30
Error Comp. Output
Voltage
-0.3 to 30
Power Dissipation
PD
Internally
Limited
Thermal Resistance
Junction to Ambient
θJA
175
Operating Junction
Temperature Range
TJ -40 to 125
Storage
Temperature Range
TSTG -65 to 150
Lead Temperature
(Soldering) 5 Sec
TLEAD
260
Units
V
V
V
W
°C/W
°C
°C
°C
© 1998 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320

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150mA ADJUSTABLE
VOLTAGE REGULATOR
LP2951
March 17, 1998
ELECTRICAL CHARACTERISTICS
Unless specified, limits are over operating temperature range (TJ = TA), VIN = VOUT(NOM) + 1V, IL=100µA, CL=1µF
Parameter
Output Voltage
LP2951CM
LP2951CM-3.3
Temp Coefficient(1)
Line Regulation
Load Regulation
Dropout Voltage
Ground Current
Dropout Ground Current
Current Limit
Reference Voltage
Feedback Bias Current
Error Comparator
Output High Leakage
Current
Output Low Voltage
Threshold Voltage
Hysteresis
Shutdown Input
Input Logic Voltage
Input Current
Regulator Shutdown
Output Current
Symbol
Conditions
Min Typ Max
VOUT
TJ = 25°C, IL = 100µA
TC
REG(LINE)
REG(LOAD)
VD
IGND
IGND(D)
ICL
VREF
IFB
0°C TJ =70°C
(VO(NOM) + 1V) VIN==30V
100µA IL==100mA
IL===100µA
IL===100mA
IL===100µA
IL===100mA
VIN = (VO(NOM) - 0.5V), IL===100µA
VOUT = 0
VREF VOUT (VIN - 1V), TJ ==25°C,
100µA IL==100mA
4.950
3.267
1.210
5.000 5.050
3.300 3.333
20 120
0.1 0.5
0.1 0.4
80 150
380 600
120 160
8 14
110 250
200 250
1.235 1.260
20 60
VOH = 30V
2
VIN = (VO(NOM) - 0.5V), IOL = 400µA
150 400
Upper
25 60
Lower
75 140
15
VSD
ISD
IO(SD)
Low
High
VSHUTDOWN = 2.4V
VSHUTDOWN = 30V
VSHUTDOWN 2V, VIN 30V,
VOUT = 0, Feedback pin to Tap
2.0
0.6
100
750
20
Units
V
ppm/°C
%
%
mV
µA
mA
µA
mA
V
nA
µA
mV
mV
mV
V
V
µA
µA
NOTE:
(1) Temperature coefficient is defined as the worst case voltage change divided by total temperature range.
© 1998 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320

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March 17, 1998
OUTLINE DRAWING SO-8
150mA ADJUSTABLE
VOLTAGE REGULATOR
LP2951
LAND PATTERN SO-8
© 1998 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320