LP38856 datasheet(5/24 Pages) TI

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LP38856

www.ti.com

SNVS336F – JUNE 2006 – REVISED AUGUST 2015

Electrical Characteristics (continued)

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

Limits apply for TJ = 25°C only unless otherwise specified. 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

LP38856-0.8: 10 mA

≤ IOUT ≤ 3 A

8.5

LP38856-0.8: 10 mA

≤ IOUT ≤ 3 A

TJ = –40°C to 125°C

LP38856-1.2: 10 mA

≤ IOUT ≤ 3 A

Ground pin current drawn from VIN

IGND(IN)

supply

LP38856-1.2: 10 mA

≤ IOUT ≤ 3 A

TJ = –40°C to 125°C

VEN ≤ 0.5 V

µA

VEN ≤ 0.5 V, TJ = –40°C to 125°C

300

10 mA

≤ IOUT ≤ 3 A

3.8

10 mA

≤ IOUT ≤ 3 A

4.5

Ground pin current drawn from VBIAS

TJ = –40°C to 125°C

IGND(BIAS)

supply

VEN ≤ 0.5 V

100

170

µA

VEN ≤ 0.5 V, TJ = –40°C to 125°C

200

VBIAS rising until device is functional

2.20

2.45

2.70

UVLO

Undervoltage lock-out threshold

VBIAS rising until device is functional

2.9

TJ = –40°C to 125°C

VBIAS falling from UVLO threshold until device is

150

300

non-functional

UVLO(HYS)

Undervoltage lock-out hysteresis

350

VIN = VOUT(NOM) + 1 V,

ISC

Output short-circuit current

6.2

VBIAS = 3 V VOUT = 0 V

ENABLE PIN

VEN = VBIAS

0.01

VEN = 0 V, VBIAS = 5.5 V

–19

–30

–40

IEN

ENABLE pin current

µA

VEN = 0 V, VBIAS = 5.5 V

–13

–51

TJ = –40°C to 125°C

VEN rising until Output = ON

1.25

1.50

VEN(ON)

Enable voltage threshold

VEN rising until Output = ON

0.9

1.55

TJ = –40°C to 125°C

VEN falling from VEN(ON) until Output = OFF

100

150

VEN(HYS)

Enable voltage hysteresis

VEN falling from VEN(ON) until Output = OFF

200

TJ = –40°C to 125°C

tOFF

Turn-OFF delay time

RLOAD × COUT << tOFF

µs

tON

Turn-ON delay time

RLOAD × COUT << tON

AC PARAMETERS

VIN = VOUT +1 V, ƒ = 120 Hz

PSRR (VIN)

Ripple rejection for VIN input voltage

VIN = VOUT + 1V, ƒ = 1 kHz

VBIAS = VOUT + 3 V, ƒ = 120 Hz

PSRR (VBIAS)

Ripple rejection for VBIAS voltage

VBIAS = VOUT + 3 V, ƒ = 1 kHz

Output noise density

ƒ = 120 Hz

µV/

√Hz

BW = 10 Hz

− 100 kHz

150

Output noise voltage

µV(RMS)

BW = 300 Hz

− 300 kHz

THERMAL PARAMETERS

Thermal shutdown junction

TSD

160

temperature

°C

TSD(HYS)

Thermal shutdown hysteresis

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