Fast Turn

On

circuit

Vreference

1.23V

Over Current &

Thermal

Protection

BYPASS

VEN2

VIN

VEN1

VOUT2

VOUT1

GND

LP3986

VOUT1

VOUT2

VIN

CIN

1PF

EN1

EN2

GND

BYPASS

CBYPASS*

0.01PF

Input

2.7V to 6.0V

1PF

LP3986

SNVS142U – AUGUST 2001 – REVISED FEBRUARY 2013

www.ti.com

Typical Application Circuit

Block Diagram

LP3986

Pin Functions

PIN DESCRIPTIONS

Name

DSBGA(1)

Function

VOUT2

A1

Output Voltage of the second LDO

EN2

B1

Enable input for the second LDO

BYPASS

C1

Bypass capacitor for the bandgap

GND

C2

Common ground

GND

C3

Common ground

EN1

B3

Enable input for the first LDO

VOUT1

A3

Output Voltage of the first LDO

VIN

A2

Common input for both LDOs

(1)

The pin numbering scheme for the DSBGA package was revised in April 2002 to conform to JEDEC standard. Only the pin numbers

were revised. No changes to the physical location of the inputs/outputs were made. For reference purposes, the obsolete numbering

scheme had VOUT2 as pin 1, EN2 as pin 2, BYPASS as pin 3, GND as pins 4 and 5, EN1 as pin 6, VOUT1 as pin 7, and VIN as pin 8.

2

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