LP38852-ADJ datasheet(6/33 Pages) TI1

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LP38852-ADJ

SNVS482F – JANUARY 2007 – REVISED DECEMBER 2015

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Electrical Characteristics (continued)

Unless otherwise specified: VOUT = 0.8 V, VIN = VOUT(NOM) + 1 V, VBIAS = 3 V, VEN = VBIAS, IOUT = 10 mA, CIN = COUT = 10 µF,

CBIAS = 1 µF, CSS = open; typical (TYP) limits are for TJ = 25°C only, and minimum (MIN) and maximum (MAX) limits apply

over the junction temperature (TJ) range of –40°C to +125°C. Minimum and maximum limits are specified through test,

design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for

reference purposes only.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VBIAS rising until device is functional

2.2

2.45

2.7

TJ = 25°C

UVLO

Undervoltage lockout threshold

VBIAS rising until device is functional

2.9

VBIAS falling from UVLO threshold until

device is non-functional

150

300

TJ = 25°C

UVLO(HYS)

Undervoltage lockout hysteresis

VBIAS falling from UVLO threshold until

350

device is non-functional

VIN = VOUT(NOM) + 1 V, VBIAS = 3 V,

ISC

Output short-circuit current

4.5

VOUT = 0 V

SOFT-START

rSS

Soft-start internal resistance

13.5

Ω

Soft-start time

tSS

CSS = 10 nF

675

μs

tSS = CSS × rSS × 5

ENABLE

VEN = VBIAS

0.01

IEN

ENABLE pin current

VEN = 0 V, VBIAS = 5.5 V, TJ = 25°C

–19

–30

–40

μA

VEN = 0 V, VBIAS = 5.5 V

–13

–51

VEN rising until output = ON, TJ = 25°C

1.25

1.5

VEN(ON)

Enable voltage threshold

VEN rising until output = ON

0.9

1.55

VEN falling from VEN(ON) until Output = OFF

100

150

TJ = 25°C

VEN(HYS)

Enable voltage hysteresis

VEN falling from VEN(ON) until Output = OFF

200

AC PARAMETERS

VIN = VOUT(NOM) + 1 V,

ƒ = 120 Hz

Ripple rejection for VIN input

PSRR (VIN)

voltage

VIN = VOUT(NOM) + 1 V,

ƒ = 1 kHz

VBIAS = VOUT(NOM) + 3 V,

ƒ= 120 Hz

Ripple rejection for VBIAS

PSRR (VBIAS)

voltage

VBIAS = VOUT(NOM) + 3 V,

ƒ = 1 kHz

Output noise density

ƒ = 120 Hz

µV/

√Hz

BW = 10 Hz

− 100 kHz

150

Output noise voltage

µVRMS

BW = 300 Hz

− 300 kHz

THERMAL PARAMETERS

Thermal shutdown junction

TSD

160

°C

temperature

TSD(HYS)

Thermal shutdown hysteresis

°C

6.6 Timing Requirements

MIN

NOM

MAX

UNIT

tOFF

Turnoff delay time, RLOAD x COUT << tOFF

µs

tON

Turnon delay time, RLOAD x COUT << tON

µs

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