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LP2950

,, LP2951

ADJUSTABLE MICROPOWER VOLTAGE REGULATORS

WITH SHUTDOWN

SLVS582D – APRIL 2006 – REVISED MARCH 2007

Electrical Characteristics (continued)

IN = 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 V

TAP, OUTPUT tied to SENSE, VSHUTDOWN ≤ 0.7 V

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

°C

FEEDBACK bias current

–40

°C to 125°C

FEEDBACK bias current

°C

0.1

nA/

°C

temperature coefficient

ERROR COMPARATOR

°C

0.01

Output leakage current

VOUT = 30 V

µA

–40

°C to 125°C

°C

150

250

VIN = VOUT(NOM) – 0.5 V,

Output low voltage

IOL = 400 µA

–40

°C to 125°C

400

°C

Upper threshold voltage

(ERROR output high)(5)

–40

°C to 125°C

°C

Lower threshold voltage

(ERROR output low)(5)

–40

°C to 125°C

140

Hysteresis(6)

°C

SHUTDOWN INPUT

Low (regulator ON)

0.7

Input logic voltage

–40

°C to 125°C

High (regulator OFF)

°C

VTAP = 2.4 V

–40

°C to 125°C

100

SHUTDOWN input current

µA

°C

450

600

VTAP = 30 V

–40

°C to 125°C

750

VSHUTDOWN ≥ 2 V,

°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 V

OUT (as VOUT is

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

(6)

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 V

OUT (as VOUT is

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

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