Texas Instruments TPS79401, TPS79418, TPS79425, TPS79428, TPS79430, TPS79433 Owner's Manual

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TPS79401, TPS79418

TPS79425, TPS79428

TPS79430, TPS79433

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SLVS349D–NOVEMBER 2001–REVISED OCTOBER

ULTRALOW-NOISE, HIGH PSRR, FAST RF 250-m A LOW-DROPOUT LINEAR

REGULATORS

FEATURES DESCRIPTION

250-m A Low-Dropout Regulator With Enable

The TPS794xx family of low-dropout (LDO) linear

Available in 1.8 V, 2.5 V, 2.8 V, V, 3.3 V, and voltage regulators features high power-supply rejec-•

(1.2 to 5.5 V) tion ratio (PSRR), ultralow-noise, fast start-up, and Adjustable

excellent line and load transient responses in small•

ip le ej ec ti

High PSRR (60 d B at k Hz)

outline, MSOP-8 Power PAD™ and SOT223-6 pack-

Ultralow Noise (32 µVrms, TPS79428)

ages. Each device in the family is stable with small

Fast Start-Up Time (50 µs) 2.2-µF ceramic capacitor on the output. The family•

uses an advanced, proprietary Bi CMOS fabrication•

Stable With 2.2-µF Ceramic Capacitor

process to yield extremely low dropout voltages (e.g.,

Excellent Load/Line Transient Response

m V at m A). Each device achieves fast

Very Low Dropout Voltage (155 m V at Full start-up times (approximately µs with 0.001-µF•

bypass capacitor) while consuming low quiescent Load)

current (170 µA typical). Moreover, when the device•

Available in MSOP-8 and SOT223-6 Packages

is placed in standby mode, the supply current is

reduced to less than µA. The TPS79428 exhibits

APPLICATIONS

approximately µVRMS of output voltage noise at

RF: VCOs, Receivers, ADCs

2.8 output with 0.1-µF bypass capacitor. Appli-

Audio cations with analog components that are•

noise-sensitive, such as portable RF electronics,•

Bluetooth™, Wireless LAN

tp ec tr al is en si ty µV /√ benefit z) from the high PSRR and low noise features as•

Cellular and Cordless Telephones

well as the fast response time.

Handheld Organizers, PDAs

DGN PACKAGE

TPS79433 TPS79428

MSOP Power PAD

(TOP VIEW) RIPPLE REJECTION OUTPUT SPECTRAL NOISE DENSITY

vs vs

OUT IN

FREQUENCY FREQUENCY

NC NC

FB EN COUT = 2.2 µF, NR GND IOUT = 10 m A CNR = 0.1 µF,

VIN = 3.8 V

NC − No internal connection

IOUT = 250 m A

DCQ PACKAGE 0.20 IOUT = 250 m A

SOT223-6 (TOP VIEW) 0.15

VIN = 4.3 V,

EN 0.10

VOUT = 3.3 V,

IN CIN = 1 µF,

IOUT = 1 m A

COUT = 10 µF, 0.05

CNR = 0.01 µF

Frequency (Hz) Frequency (Hz)

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.

Bluetooth is trademark of Bluetooth SIG, Inc.

Power PAD is trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Copyright 2001–2004, 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.