1 PF

ON-

OFF-

VOUT

1 PF

LP38869

OUT

OUT

OUT

OUT

SET

GND

IN

IN

IN

IN

SS

SHDN

RST

DAP

RESET

VIN

CSS

LP38869

www.ti.com

SNVS877B – AUGUST 2012 – REVISED APRIL 2013

LP38869 1A FlexCap, Low-Dropout Linear Regulator with 0.75% Accuracy

Check for Samples: LP38869

1

FEATURES

DESCRIPTION

The LP38869 low-dropout linear regulator operates

2

•

Operating Input Supply Range: +2.7V to + 5.5V

with an input voltage supply from +2.7V to +5.5V

•

Maximum Continuous Output Current: 1A

input, and delivers a specified 1A load current with a

•

Preset Output Voltage of 2.5V, or Adjustable

low 200 mV dropout. The high 50 dB PSRR at 100

Output Voltage From 0.8V to 5.0V

kHz results from a high gain control loop that also

yields excellent transient response. Coupled with a

•

Pre-Set Output Initial VOUT Tolerance ±0.5%

high

accuracy

output

voltage,

±0.75

%

over

•

Adjustable VREF Tolerance of ±0.75%

temperature, the LP38869 is an ideal power supply

•

PSRR of 50dB at 100kHz

for FPGAs, DSPs or MCUs. Output voltage is preset

at +2.5V, or may be adjustable between +0.8V to +5V

•

Low 200 mV Dropout at 1A

with an external resistor divider.

•

Typical 2 µA Supply Current in Shutdown

The LP38869 only needs 1

μF output capacitance for

Mode

stability. The FlexCap compensation allows the use of

•

Adjustable Soft-Start for Output Current

any type of output capacitor, regardless of ESR.

•

Fold-Back Output Current Limit

Other features include: Soft-Start; delayed reset

•

Stable With Ceramic, Tantalum, or Aluminum

output; low-power shutdown; short-circuit protection;

and thermal shutdown protection

Capacitors

•

Stable With 1uF Input/Output Capacitors

Ground Pin Current: Typically less than 1 mA at 1A

load

•

Thermal Shutdown

•

16-pin HTSSOP Package

Shutdown Mode: Typically 2 µA quiescent current

when the SHDN pin is pulled low.

APPLICATIONS

Simplified Compensation: Stable with any type of

output capacitor.

•

DSA, FPGA and MCU Power Supply

•

SMPS Post-Regulator

•

Applications Requiring Sequencing

•

Gibabit SERDES Termination Supply

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.