LP4951C datasheet(3/14 Pages) NSC

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Electrical Characteristics

LP4951C

Parameter

Conditions (Note 2)

Typ

Tested

Limit (Note

Desgin

Limit (Note

Units

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

(Note 7)

1.335

V max

1.135

V min

Feedback Pin Bias

Current

nA max

Reference Voltage

Temperature Coefficient

(Note 12)

ppm/˚C

Feedback Pin Bias

Current Temperature

Coefficient

0.1

nA/˚C

Error Comparator

Output Leakage Current

VOH = 30V

0.01

µA max

Output Low Voltage

IN = 4.5V

OL = 400µA

150

250

mV max

400

mV max

Upper Threshold Voltage

(Note 4)

mV min

Lower Threshold Voltage

(Note 6)

mV max

140

mV max

Hysteresis

(Note 6)

Shutdown Input

Input Logic Voltage

1.3

Low (Regulator ON)

0.7

V max

High (Regulator OFF)

2.0

V min

Shutdown Pin Input

Current

SHUTDOWN = 2.4V

µA max

100

µA max

SHUTDOWN = 30V

450

600

µA max

750

µA max

Regulator Output Current

in Shutdown

(Note 11)

µA max

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device

is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical

Characteristics tables.

Note 2: Unless otherwise specified all limits guaranteed 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.

Note 3: Guaranteed and 100% production tested.

Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.

Note 5: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100 mV 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: 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 guaranteed to go low when the output drops by 95 mV x 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% guaranteed.

Note 7: VREF ≤ VOUT ≤ (VIN − 1V), 2.3V ≤ VIN ≤ 30V, 100µA ≤ IL ≤ 100mA, TJ ≤ TJMAX.

Note 8: The junction-to-ambient thermal resistances are as follows: 180˚C/W and 160˚C/W for the TO-92 package with 0.40 inch and 0.25 inch leads to the printed

circuit board (PCB) respectively, 160˚C/W for the molded plastic SOP (M). The above thermal resistances for the M package apply when the package is soldered

directly to the PCB.

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