LP2951 datasheet(2/3 Pages) FCI

2 / 3 page

ELECTRICALCHARACTERISTICS(atT a=25

oC,VIN=15V;unlessotherwisenoted)

Parameter

Conditions (Note 2)

Min

Typ

Max

Units

Output Voltage

-25

°C≤TJ≤85°C

Full Operating Temperature

0.985 |V0|

0.98 |V0|

1.015 |V0|

1.02 |V0|

Output Voltage

100

µA ≤ IL ≤ 100mA, TJ≤TJMAX

0.976|V0|

1.024 |V0|

Output Voltage Temperature Coefficient

(Note 1)

150

ppm/

°C

Line Regulation (Note 3)

V0 + 1V ≤ Vin ≤ 30V (Note 4)

0.04

0.4

Load Regulation (Note 3)

100

µA ≤ IL ≤ 100mA

0.1

0.3

Dropout Voltage (Note 5)

IL=100 µA

IL=100 mA

380

450

Ground Current

IL=100 µA

IL=100 mA

120

µA

Dropout Ground Current

Vin=V0 - 0.5V, IL=100 µA

110

170

µA

Current Limit

Vout=0

160

200

Thermal Regulation

0.05

0.2

%/W

Output Noise, 10Hz to 100KHz

CL=1µF

CL=200µF

CL=3.3µF

(Bypass=0.01

µF pins 7 to 1

(LP2951-XX))

430

160

100

µV rms

8-pin Versions only

Reference Voltage

1.21

1.235

1.26

Reference Voltage

Over Temperature (Note 6)

1.185

1.285

Feedback Pin Bias Current

Reference Voltage Temperature Coefficient

(Note 7)

°C

Feedback Pin Bias Current Temperature Coefficient

0.1

°C

Error Comparator

Output Leakage Current

Voh=30V

0.01

1.0

µA

Output Low Voltage

Vin=4.5V, IOL=400 µA

150

250

Upper Threshold Voltage

(Note 8)

Lower Threshold Voltage

(Note 8)

Hysteresis

(Note 8)

Shutdown Input

Input Logic Voltage

Low (Regulator ON)

High (Regulator OFF)

1.3

0.7

Shut down Pin Input Current

VS=2.4V

VS=30V

450

600

Regulator Output Current in Shutdown

(Note 9)

VOUT = 5.0 V

µA

3.3V

≤ VOUT < 5.0 V

2.0V

≤ VOUT < 3.3 V

Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Note 2: Unless otherwise specified all limits guaranteed for TJ = 25°C, Vin = V0 + 1V, IL = 100µA and CL = 1µF. Additional conditions for the

8-pin versions are feedback tied to -XX V tap and output tied to output Sense (Vout = XX V) and Vshutdown ≤ 0.8 V

Note 3: Regulations is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

heating effects are covered under the specification for thermal regulation.

Note 4: Line regulation for LP2951-XX is tested at 150

°C for IL = 1mA. For IL = 100µA and TJ = 125°C, line regulation is guaranteed by design to

0.2%. See typical performance characteristics for line regulation versus temperature and load current.

Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured

at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be

taken into account.

Note 6: Vref

≤ Vout ≤ (Vin - 1V), 2.3V ≤ Vin ≤ 30V, 100µA ≤ IL ≤ 100mA, TJ ≤ TJMAX

Note 7: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range

Note 8: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage

measured at V0 + 1V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = Vout/Vref= (R1 +

R2)/R2. For example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95mV x 5V/

1.235V=384mV. Thresholds remain constant as a percent of Vout as Vout is varied , with the dropout warning occurring at typically 5% below

nominal, 7.5% guaranteed.

Note 9: Vshutdown ≥ 2V, Vin ≤ 30V, Vout = 0, Feed-back pin tied to -XX V Tap.

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