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Part: LP2951CMTR
Category:
Power Management
-> Regulators
-> Linear Regulators
Description: 100 ma Adjustable Voltage Regulator
Company: Semtech Corporation
Datasheet: Download LP2951CMTR datasheet File size : 606 kB
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Datasheet text preview:
Fixed 5.0V or Adjustable 100mA Voltage Regulator
POWER MANAGEMENT Description
The LP2951 low power voltage regulator has low quiesc e n t 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 inc l u d e s 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 1.235 volts and 29 volts using external resistor pairs.
LP2951
Features
Guaranteed 100mA current Adjustable output voltage - 1.235V to 29V Accurate 1.235V reference Internally set 5V output optional Low dropout voltage - 300mV @ 100mA Regulator or reference functions Full industrial temperature range SO-8 package
Applications
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 R2 ERROR OUTPUT VIN
SENSE SHDN GND
R1 VOUT = VREF 1 + R2
+
C2 3.3uF
100k
VOUT = 5V
1 2
U1 OUT
LP2951 IN FB TAP ERRORB R1 8 7 6 5 ERROR OUTPUT VIN
SENSE SHDN GND
SHUTDOWN INPUT + C1 3.3uF
3 4
100k
Revision 5, April 2003
1
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LP2951
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter Supply Voltage Shutdown Input Voltage Error Comp. Output Voltage Power Dissipation Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient(1) Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 5 Sec.
Symbol VIN VSHDN
Maximum -0.3 to 30 -0.3 to 30 -0.3 to 30
Units V V V W °C/W °C/W °C °C °C
PD J C JA TJ TSTG TLEAD
Internally Limited 47 65 -40 to 125 -65 to 150 300
Note: (1) 2 inch square of 1/16" FR4, double sided, 1oz. minimum copper weight.
Electrical Characteristics(3)
Unless specified: (VOUT(NOM) + 1V) VIN 30V, 100µA IOUT 100mA, COUT = 3.3µF, TA = 25°C. Values in bold apply over full operating temperature range.
Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage
Symbol VOUT REG(LINE) REG(LOAD) VD
Conditions VIN = 6V, IOUT = 100µA VIN = 2.235V to 30V, IOUT = 100µA VIN = 2.235V, IOUT = 100µA to 100mA IOUT = 100µA IOUT = 100mA
Min
Typ 5.000 0.1 0.15 50 300 130 8 175
Max
Units V
0.8 0.40 150 600 200 20 250 250
% % mV
Ground Pin Current
IGND
VIN = 2.235V, IOUT = 100µA VIN = 2.235V, IOUT = 100mA
µA mA µA mA V
Dropout Ground Pin Current Short Circuit Current Limit Reference Voltage
IGND(D) ISC VREF
VIN = (VOUT(NOM) - 0.5V), IOUT = 100µA VOUT = 0V VIN = 2.235V, IOUT = 100µA -1% -2.5%
1.2350
+1% +2.5%
Temperature Coefficient(1)(2) Feedback Bias Current(1)
TC(REF) IFB
VIN = 2.235V, IOUT = 100µA
20 5
120 60
ppm/°C nA
2003 Semtech Corp.
2
www.semtech.com
LP2951
POWER MANAGEMENT Electrical Characteristics(3) (Cont.)
Unless specified: (VOUT(NOM) + 1V) VIN 30V, 100µA IOUT 100mA, COUT = 3.3µF, TA = 25°C. Values in bold apply over full operating temperature range.
Parameter Error Comparator Output High Leakage Current Output Low Voltage Threshold Voltage
Symbol
Conditions
Min
Typ
Max
Units
IL(OH) VOL VTH
VOH = 30V VIN = (VOUT(NOM) - 0.5V), IOL = 400µA Upper Lower 25
0.1 225 90 95 5
2 500
µA mV mV
175 mV
Hysteresis Shutdow n Input Input Logic Voltage
VHYST
VSHDN
Low High 2.2 25 450
0.6
V V
Input Current
ISHDN
VSHDN = 2.4V VSHDN = 30V
100 1000 30
µA
Regulator Shutdown Output Current
IOUT(SHDN)
VSHDN 2V, VIN 30V, VOUT = 0V, Feedback pin to Tap
µA
Notes: (1) Guaranteed by design. (2) Temperature coefficient is defined as the worst case voltage change divided by the total temperature range. (3) This device is ESD sensitive. Use of standard ESD handling precautions is required.
2003 Semtech Corp.
3
www.semtech.com
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