LP38859 datasheet(5/25 Pages) TI

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LP38859

www.ti.com

SNVS337F – JUNE 2006 – REVISED SEPTEMBER 2015

6.5 Electrical Characteristics

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

Typical limits apply for TJ = 25°C; minimum and maximum limits apply over the junction temperature (TJ) range of -40°C to

+125°C, 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

VOUT(NOM) + 1 V ≤ VIN ≤ VBIAS

3 V

≤ VBIAS ≤ 5.5 V

-1%

10 mA

≤ IOUT ≤ 3 A, TJ = 25°C

VOUT(NOM) + 1 V ≤ VIN ≤ VBIAS

3 V

≤ VBIAS ≤ 5.5 V

–3%

VOUT

VOUT accuracy

10 mA

≤ IOUT ≤ 3 A

VOUT(NOM) + 1 V ≤ VIN ≤ VBIAS

3 V

≤ VBIAS ≤ 5.5 V

–2%

10 mA

≤ IOUT ≤ 3 A

0°C

≤ TJ ≤ +125°C

ΔVOUT/ΔVIN

Line regulation, VIN

(1)

VOUT(NOM) + 1 V ≤ VIN ≤ VBIAS

0.04

%/V

ΔVOUT/ΔVBIAS

Line regulation, VBIAS

(1)

3 V

≤ VBIAS ≤ 5.5 V

0.10

%/V

ΔVOUT/ΔIOUT

Output voltage load regulation(2)

10 mA

≤ IOUT ≤ 3 A

0.2

%/A

IOUT = 3 A, TJ = 25°C

240

300

VDO

Dropout voltage(3)

IOUT = 3 A

450

LP38859-0.8

8.5

10 mA

≤ IOUT ≤ 3 A, TJ = 25°C

LP38859-0.8

10 mA

≤ IOUT ≤ 3 A

Quiescent current drawn from

IGND(IN)

VIN supply

LP38859-1.2

10 mA

≤ IOUT ≤ 3 A, TJ = 25°C

LP38859-1.2

10 mA

≤ IOUT ≤ 3 A

10 mA

≤ IOUT ≤ 3 A, TJ = 25°C

3.8

Quiescent current drawn from

IGND(BIAS)

VBIAS supply

10 mA

≤ IOUT ≤ 3 A

4.5

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

350

until device is non-functional

VIN = VOUT(NOM) + 1 V

ISC

Output short-circuit current

6.2

VBIAS = 3 V, VOUT = 0 V

SOFT-START

LP38859-0.8

13.5

rSS

Soft-start internal resistance

Ω

LP38859-1.2

13.5

18.5

LP38859-0.8, CSS = 10 nF

675

Soft-start time

tSS

μs

tSS = CSS × rSS × 5

LP38859-1.2, CSS = 10 nF

800

(1)

Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.

(2)

Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load

to full load.

(3)

Dropout voltage is defined the as input to output voltage differential (VIN – VOUT) where the input voltage is low enough to cause the

output voltage to drop no more than 2% from the nominal value.

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