LP4950C-5V, LP4951C

SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013

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ELECTRICAL CHARACTERISTICS

LP4951C

Parameter

Conditions (1)

Typ

Tested Limit

Design Limit

Units

(2)

(3)

8-PIN VERSIONS ONLY

Reference Voltage

1.235

1.285

V max

1.295

V max

1.185

V min

1.165

Vmin

Reference Voltage

(4)

1.335

V max

1.135

V min

Feedback Pin Bias Current

20

40

nA max

60

nA max

Reference Voltage

(5)

50

ppm/°C

Temperature Coefficient

Feedback Pin Bias Current

0.1

nA/°C

Temperature Coefficient

Error Comparator

Output Leakage Current

VOH = 30V

0.01

1

μA max

2

μA max

Output Low Voltage

VIN = 4.5V

150

250

mV max

IOL = 400μA

400

mV max

Upper Threshold Voltage

(3)

60

40

mV min

25

mV min

Lower Threshold Voltage

(6)

75

95

mV max

140

mV max

Hysteresis

(6)

15

mV

Shutdown Input

Input Logic Voltage

1.3

V

Low (Regulator ON)

0.7

V max

High (Regulator OFF)

2.0

V min

Shutdown Pin Input Current

VSHUTDOWN = 2.4V

30

50

μA max

100

μA max

VSHUTDOWN = 30V

450

600

μA max

750

μA max

Regulator Output Current in

(7)

3

10

μA max

Shutdown

20

μA max

(1)

Unless otherwise noted all limits specified for VIN = 6V, IL = 100μA and CL = 1μF. Limits appearing in boldface type apply over the

entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25°C. Additional conditions for the 8-

pin versions are FEEDBACK tied to VTAP, OUTPUT tied to SENSE (VOUT = 5V), and VSHUTDOWN ≤ 0.8V.

(2)

Specified and 100% production tested.

(3)

Specified but not 100% production tested. These limits are not used to calculate outgoing AQL levels.

(4)

VREF ≤ VOUT ≤ (VIN − 1V), 2.3V ≤ VIN ≤ 30V, 100μA ≤ IL ≤ 100mA, TJ ≤ TJMAX.

(5)

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

(6)

Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage

measured at VIN = 6V. 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 specified to go low when the output drops by 95

mV × 5V/1.235V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at

typically 5% below nominal, 7.5% specified.

(7)

VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, Feedback pin tied to VTAP.

4

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