LP2951CM [SEMTECH]
150mA ADJUSTABLE VOLTAGE REGULATOR; 150毫安可调稳压
| 型号： | LP2951CM |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | 150mA ADJUSTABLE VOLTAGE REGULATOR |
| 文件： | 总3页 (文件大小：70K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
150mA ADJUSTABLE
VOLTAGE REGULATOR
LP2951
March 17, 1998
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
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.
•= 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
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.
APPLICATIONS
•= Microcontroller supplies
•= Linear regulators
•= Adjustable Supplies
•= Switching power supplies - post-regulation
•= Portable modems
•= Battery powered systems
•= Cellular telephones
•= Voltage references
BLOCK DIAGRAM
ORDERING INFORMATION
DEVICE(1)(2)
LP2951CM-X.X
Notes:
OUTPUT
PACKAGE
ADJ
SO-8
(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 Maximum Units
PIN CONFIGURATION
Supply Voltage
VIN
-0.3 to 30
-0.3 to 30
V
V
Shutdown Input
Voltage
Error Comp. Output
Voltage
-0.3 to 30
V
W
Power Dissipation
Internally
Limited
PD
Thermal Resistance
Junction to Ambient
175
°C/W
°C
θJA
TJ
Operating Junction
Temperature Range
-40 to 125
-65 to 150
260
Storage
Temperature Range
TSTG
TLEAD
°C
Lead Temperature
(Soldering) 5 Sec
°C
1
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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
Symbol
Conditions
Min
Typ
Max
Units
Output Voltage
LP2951CM
VOUT
TJ = 25°C, IL = 100µA
4.950 5.000 5.050
3.267 3.300 3.333
V
LP2951CM-3.3
Temp Coefficient(1)
Line Regulation
Load Regulation
Dropout Voltage
TC
20
0.1
0.1
80
120
0.5
ppm/°C
%
0°C ≤ TJ ≤=70°C
(VO(NOM) + 1V) ≤ VIN=≤=30V
100µA ≤ IL=≤=100mA
IL===100µA
REG(LINE)
REG(LOAD)
VD
0.4
%
150
600
160
14
mV
380
120
8
IL===100mA
Ground Current
IGND
µA
mA
µA
mA
V
IL===100µA
IL===100mA
Dropout Ground Current
Current Limit
IGND(D)
ICL
110
200
250
250
VIN = (VO(NOM) - 0.5V), IL===100µA
VOUT = 0
Reference Voltage
VREF
1.210 1.235 1.260
VREF ≤ VOUT ≤ (VIN - 1V), TJ ==25°C,
100µA ≤ IL=≤=100mA
Feedback Bias Current
IFB
20
60
nA
µA
Error Comparator
Output High Leakage
Current
VOH = 30V
2
Output Low Voltage
Threshold Voltage
VIN = (VO(NOM) - 0.5V), IOL = 400µA
150
60
400
mV
mV
Upper
Lower
25
75
140
0.6
Hysteresis
15
mV
Shutdown Input
Input Logic Voltage
VSD
Low
High
V
V
2.0
Input Current
ISD
VSHUTDOWN = 2.4V
100
750
20
µA
VSHUTDOWN = 30V
Regulator Shutdown
Output Current
IO(SD)
µA
V
SHUTDOWN ≥ 2V, VIN ≤ 30V,
VOUT = 0, Feedback pin to Tap
NOTE:
(1) Temperature coefficient is defined as the worst case voltage change divided by total temperature range.
2
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ADJUSTABLE
VOLTAGE REGULATOR
LP2951
March 17, 1998
OUTLINE DRAWING SO-8
LAND PATTERN SO-8
3
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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