OUT(FB)

2

3

4

5

6

7

8

1

SET

FB

GND(CP)

CP

EN

IN(CP)

VIN

VOUT

GND

GND

CIN

CCP

COUT

R1

R2

LP38788-ADJ

GND

IN

IN

OUT

OUT

9

10

11

12

VEN

DAP

ON

OFF

+

LP38788, LP38788-ADJ

www.ti.com

SNVS802B – APRIL 2012 – REVISED OCTOBER 2012

LP38788-ADJ High PSRR, Ultra Low Noise, 800mA Linear Voltage Regulator for

RF/Analog Circuits

Check for Samples: LP38788, LP38788-ADJ

1

FEATURES

Capacitors

•

Excellent Line and Load Transient Response

2

•

Ultra-Low Output Noise: 4 µVRMS (10Hz to 100

kHz)

•

Over-Current and Over-Temperature

Protection

•

High PSRR: 70db at 1 kHz; 60dB at 10 kHz

•

Wide Operating Input Voltage Range: 4.5V to

APPLICATIONS

15V

•

RF and VCO Power

•

±1.0% Output Voltage Initial Accuracy (TJ =

25°C)

•

Wireless LAN Devices

•

Very Low Dropout : 250 mV (typical) at 800mA

•

Wireless Cable Modems

•

Stable with Ceramic or Tantalum Output

•

Low Noise Post Regulation

DESCRIPTION

The LP38788-ADJ is a high performance linear regulator capable of supplying 800 mA output current. Designed

to meet the requirements of sensitive RF/Analog circuitry, the LP38788 implements a novel linear topology on an

advanced CMOS process to deliver ultra-low output noise and high PSRR at switching power supply

frequencies. The LP38788-ADJ is stable with both ceramic and tantalum output capacitors and requires a

minimum output capacitor of only 1 µF for stability.

The LP38788-ADJ can operate over a wide input voltage range (4.5V to 15V) making it well suited for many post

regulation applications.

Available in a 12-Lead LLP package (4.0 x 4.0 x 0.8 mm).

Typical Application Circuit

*.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCT PREVIEW information concerns products in the

Copyright © 2012, Texas Instruments Incorporated

formative or design phase of development. Characteristic data and

other specifications are design goals. Texas Instruments reserves

the right to change or discontinue these products without notice.