ENABLE

LOGIC

-

+

MOSFET

DRIVER

FOLDBACK

CURRENT

LIMITING

1.25-V

REFERENCE

THERMAL

SHUTDOWN

IN

OUT

GND

P-FET

P-FET

R1

R2

ENABLE

LOGIC

-

+

MOSFET

DRIVER

FOLDBACK

CURRENT

LIMITING

1.25-V

REFERENCE

THERMAL

SHUTDOWN

IN

OUT

GND

P-FET

P-FET

N/C

R1

R2

SNS

LP38691, LP38693, LP38691-Q1, LP38693-Q1

www.ti.com

SNVS321O – JANUARY 2005 – REVISED DECEMBER 2015

8 Detailed Description

8.1 Overview

The LP38691 and LP38693 are designed to meet the requirements of portable, battery-powered digital systems

providing an accurate output voltage with fast start-up. When disabled via a low logic signal at the enable pin

(EN), the power consumption is reduced to virtually zero (LP38693 only).

The LP38691 and LP38693 perform well with a single 1-

μF input capacitor and a single 1-μF ceramic output

capacitor.

8.2 Functional Block Diagrams

Figure 23. LP38691 Functional Diagram (WSON)

Figure 24. LP38691 Functional Diagram (TO-252)

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Product Folder Links: LP38691 LP38693 LP38691-Q1 LP38693-Q1