LP38851SX-ADJ datasheet(4/29 Pages) TI

Part #	LP38851SX-ADJ

Description	LP38851 800 mA Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start

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Manufacturer	TI [Texas Instruments]

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LP38851

SNVS492C – JUNE 2007 – REVISED APRIL 2013

www.ti.com

ELECTRICAL CHARACTERISTICS

Unless otherwise specified: VOUT = 0.80V, VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, VEN = VBIAS, IOUT = 10 mA, CIN = COUT = 10 µF,

CBIAS = 1 µF, CSS = open. Limits in standard type are for TJ = 25°C only; limits in boldface type 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.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VOUT(NOM)+1V ≤ VIN ≤ VBIAS ≤ 4.5V

(1)

492.5

507.5

3.0V

≤ VBIAS ≤ 5.5V,

500.

485.0

515.0

10 mA

≤ IOUT ≤ 800 mA

VADJ

VADJ Accuracy

mV

VOUT(NOM)+1V ≤ VIN ≤ VBIAS ≤ 4.5V

(1)

3.0V

≤ VBIAS ≤ 5.5V,

490.0

500.

510.0

10 mA

≤ IOUT ≤ 800 mA,

0°C

≤ TJ ≤ +125°C

3.0V

≤ VBIAS ≤ 5.5V

0.80

1.20

VOUT

VOUT Range

V

4.5V

≤ VBIAS ≤ 5.5V

0.80

1.80

ΔVOUT/ΔVIN

Line Regulation, VIN

(2)

VOUT(NOM)+1V ≤ VIN ≤ VBIAS

-

0.04

-

%/V

ΔVOUT/ΔVBIAS Line Regulation, VBIAS

(2)

3.0V

≤ VBIAS ≤ 5.5V

-

0.10

-

%/V

ΔVOUT/ΔIOUT

Output Voltage Load Regulation (3)

10 mA

≤ IOUT ≤ 800 mA

-

0.2

-

%/A

150

VDO

Dropout Voltage (4)

IOUT = 800 mA

-

115

mV

200

VOUT = 0.80V

8.5

VBIAS = 3.0V

-

7.0

mA

9.0

Quiescent Current Drawn from VIN

10 mA

≤ IOUT ≤ 800 mA

IGND(IN)

Supply

100

VEN ≤ 0.5V

1

μA

300

3.8

10 mA

≤ IOUT ≤ 800 mA

-

3.0

mA

4.5

Quiescent Current Drawn from

IGND(BIAS)

VBIAS Supply

170

VEN ≤ 0.5V

100

μA

200

2.20

2.70

UVLO

Under-Voltage Lock-Out Threshold

VBIAS rising until device is functional

2.45

V

2.00

2.90

VBIAS falling from UVLO threshold until

60

300

UVLO(HYS)

Under-Voltage Lock-Out Hysteresis

150

mV

device is non-functional

50

350

VIN = VOUT(NOM) + 1V,

ISC

Output Short-Circuit Current

-

2.3

-

A

VBIAS = 3.0V, VOUT = 0.0V

Soft-Start

rSS

Soft-Start internal resistance

11.0

14.0

17.0

k

Ω

Soft-Start time

tSS

CSS = 10 nF

-

700

-

μs

tSS = CSS × rSS × 5

Enable

VEN = VBIAS

-

0.01

-

IEN

ENABLE pin Current

μA

-24

-43

VEN = 0.0V, VBIAS = 5.5V

-35

-21

-50

1.00

1.50

VEN(ON)

Enable Voltage Threshold

VEN rising until Output = ON

1.25

V

0.90

1.55

VEN falling from VEN(ON) until Output =

50

150

VEN(HYS)

Enable Voltage Hysteresis

100

mV

OFF

30

200

tOFF

Turn-OFF Delay Time

RLOAD x COUT << tOFF

-

20

-

µs

tON

Turn-ON Delay Time

RLOAD x COUT << tON

-

15

-

AC Parameters

(1)

VIN cannot exceed either VBIAS or 4.5V, whichever value is lower.

(2)

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

(3)

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.

(4)

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

output voltage to drop 2% from the nominal value.

4

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