LP2950 datasheet(6/32 Pages) TI

6 / 32 page

LP2950, LP2951

SLVS582I – APRIL 2006 – REVISED NOVEMBER 2014

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Electrical Characteristics (continued)

VIN = VOUT (nominal) + 1 V, IL = 100 μA, CL = 1 μF (5-V versions) or CL = 2.2 μF (3-V and 3.3-V versions),

8-pin version: FEEDBACK tied to VTAP, OUTPUT tied to SENSE, VSHUTDOWN ≤ 0.7 V

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

(LP2951-xx) 8-PIN VERSION ONLY ADJ

25°C

1.218

1.235

1.252

–40°C to 125°C

1.212

1.257

Reference voltage

VOUT = VREF to (VIN – 1 V),

VIN = 2.3 V to 30 V,

–40°C to 125°C

1.200

1.272

IL = 100 μA to 100 mA

Reference voltage

25°C

ppm/°C

temperature coefficient(1)

25°C

FEEDBACK bias current

–40°C to 125°C

FEEDBACK bias current

25°C

0.1

nA/°C

temperature coefficient

ERROR COMPARATOR

25°C

0.01

Output leakage current

VOUT = 30 V

μA

–40°C to 125°C

25°C

150

250

VIN = VOUT(NOM) – 0.5 V,

Output low voltage

IOL = 400 μA

–40°C to 125°C

400

25°C

Upper threshold voltage

(ERROR output high)(5)

–40°C to 125°C

25°C

Lower threshold voltage

(ERROR output low)(5)

–40°C to 125°C

140

Hysteresis(5)

25°C

SHUTDOWN INPUT

Low (regulator ON)

0.7

Input logic voltage

–40°C to 125°C

High (regulator OFF)

25°C

SHUTDOWN = 2.4 V

–40°C to 125°C

100

SHUTDOWN input current

μA

25°C

450

600

SHUTDOWN = 30 V

–40°C to 125°C

750

VSHUTDOWN ≥ 2 V,

25°C

Regulator output current

VIN ≤ 30 V, VOUT = 0,

μA

in shutdown

–40°C to 125°C

FEEDBACK tied to VTAP

(5)

Comparator thresholds are expressed in terms of a voltage differential equal to the nominal reference voltage (measured at

VIN – VOUT = 1 V) minus FEEDBACK terminal voltage. 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 5 V, the ERROR output is specified to

go low when the output drops by 95 mV × 5 V/1.235 V = 384 mV. Thresholds remain constant as a percentage of VOUT (as VOUT is

varied), with the low-output warning occurring at 6% below nominal (typ) and 7.7% (max).

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