LP38851S-ADJ datasheet(2/29 Pages) TI1

Part #	LP38851S-ADJ

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

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TAB

IS

GND

BIAS

OUT

GND

SS

1

2

3

4

5

IN

6

7

ADJ

EN

TAB

IS

GND

BIAS

OUT

GND

SS

1

2

3

4

5

IN

6

7

ADJ

EN

DAP

Connect to GND

IN

EN

N/C

SS

5

6

7

8

OUT

ADJ

GND

BIAS

1

2

3

4

IN

BIAS

GND

OUT

VOUT

VIN

VBIAS

CIN

10 PF Ceramic

COUT

10 PF

Ceramic

CBIAS

1 PF

GND

LP38851-ADJ

ADJ

R1

R2

CFF

VEN

SS

CSS

EN

LP38851

SNVS492C – JUNE 2007 – REVISED APRIL 2013

www.ti.com

TYPICAL APPLICATION CIRCUIT

Connection Diagram

Figure 3. 8-Lead SO PowerPad - Top View

Figure 1. 7-Lead PFM - Top View

See DDA Package

See KTW0007B Package

Figure 2. 7-Lead SFM - Top View

See NDZ0007B Package

PIN DESCRIPTIONS

SFM

PFM

SO PowerPad

Pin Description

Pin #

Symbol

Soft-Start capacitor connection. Used to control the rise time of

1

5

SS

VOUT at turn-on.

2

6

EN

Device Enable, High = On, Low = Off.

3

7

IN

The unregulated voltage input

4

GND

Ground

5

1

ADJ

The feedback connection to set the output voltage

6

2

OUT

The regulated output voltage

7

3

BIAS

The supply for the internal control and reference circuitry.

-

8

N/C

No internal connection

The SFM and PFM TAB is a thermal and electrical connection that

is physically attached to the backside of the die, and used as a

TAB

-

TAB

thermal heat-sink connection. See APPLICATION INFORMATION

for details.

2

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LP38851S-ADJ Datasheet(PDF) 2 Page - Texas Instruments

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