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150mA ADJUSTABLE VOLTAGE REGULATOR
March 17, 1998
LP2951
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 series 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 (3.3 volt for LP2951CM-3.3) regulator or adjusted between 1.24 volts and 29 volts using external resistor pairs.
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
BLOCK DIAGRAM
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 ADJ
PACKAGE SO-8
LP2951CM-X.X
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.
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol VIN Maximum -0.3 to 30 -0.3 to 30 -0.3 to 30 PD JA TJ TSTG TLEAD Internally Limited 175 -40 to 125 -65 to 150 260 Units V V V W C/W C C C
PIN CONFIGURATION
Supply Voltage Shutdown Input Voltage Error Comp. Output Voltage Power Dissipation Thermal Resistance Junction to Ambient Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 5 Sec
1 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ADJUSTABLE VOLTAGE REGULATOR
March 17, 1998
LP2951
ELECTRICAL CHARACTERISTICS
Unless specified, limits are over operating temperature range (TJ = TA), VIN = VOUT(NOM) + 1V, IL=100A, CL=1F Parameter Output Voltage LP2951CM LP2951CM-3.3 Temp Coefficient Line Regulation Load Regulation Dropout Voltage
(1)
Symbol VOUT TC REG(LINE) REG(LOAD) VD
Conditions TJ = 25C, IL = 100A 0C TJ =70C (VO(NOM) + 1V) VIN==30V 100A IL==100mA IL===100A IL===100mA IL===100A IL===100mA VIN = (VO(NOM) - 0.5V), IL===100A VOUT = 0 VREF VOUT (VIN - 1V), TJ ==25C, 100A IL==100mA
Min 4.950 3.267
Typ 5.000 3.300 20 0.1 0.1 80 380 120 8 110 200
Max 5.050 3.333 120 0.5 0.4 150 600 160 14 250 250 1.260 60
Units V
ppm/C % % mV
Ground Current
IGND
A mA A mA V nA
Dropout Ground Current Current Limit Reference Voltage Feedback Bias Current Error Comparator Output High Leakage Current Output Low Voltage Threshold Voltage
IGND(D) ICL VREF IFB
1.210
1.235 20
VOH = 30V VIN = (VO(NOM) - 0.5V), IOL = 400A Upper Lower 25 150 60 75 15
2 400
A mV mV
140 mV
Hysteresis Shutdown Input Input Logic Voltage VSD ISD IO(SD) Low High Input Current VSHUTDOWN = 2.4V VSHUTDOWN = 30V Regulator Shutdown Output Current VSHUTDOWN 2V, VIN 30V, VOUT = 0, Feedback pin to Tap 2.0
0.6
V V
100 750 20
A
A
NOTE: (1) Temperature coefficient is defined as the worst case voltage change divided by total temperature range.
2 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ADJUSTABLE VOLTAGE REGULATOR
March 17, 1998
LP2951
OUTLINE DRAWING SO-8
LAND PATTERN SO-8
3 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

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