BST

SW

COMP

FB

SS

RAMP

RT

VCC

VIN

OUT

IS

GND

LM5576

VIN

VOUT

SYNC

SD

LM5576Q0

www.ti.com

SNOSB24B – OCTOBER 2008 – REVISED APRIL 2013

LM5576Q0 SIMPLE SWITCHER® 75V, 3A Step-Down Switching Regulator

Check for Samples: LM5576Q0

1

FEATURES

DESCRIPTION

The

LM5576Q0

is

an

easy

to

use

SIMPLE

2

•

LM5576Q0 is an Automotive Grade Product

SWITCHER buck regulator which allows design

that is AEC-Q100 Grade 0 Qualified

engineers to design and optimize a robust power

•

-40°C to 150°C Operating Junction

supply

using

a

minimum

set

of

components.

Temperature

Operating with an input voltage range of 6 - 75V, the

LM5576Q0 delivers 3A of continuous output current

•

Integrated 75V, 170m

Ω N-Channel MOSFET

with an integrated 170m

Ω N-Channel MOSFET. The

•

Ultra-Wide Input Voltage Range from 6V to 75V

regulator

utilizes

an

Emulated

Current

Mode

•

Adjustable Output Voltage as Low as 1.225V

architecture which provides inherent line regulation,

•

1.65% Feedback Reference Accuracy

tight load transient response, and ease of loop

compensation without the usual limitation of low-duty

•

Operating Frequency Adjustable Between

cycles associated with current mode regulators. The

50kHz and 500kHz with Single Resistor

operating frequency is adjustable from 50kHz to

•

Master or Slave Frequency Synchronization

500kHz to allow optimization of size and efficiency.

•

Adjustable Soft-Start

To reduce EMI, a frequency synchronization pin

allows multiple IC’s from the LM(2)557x family to self-

•

Emulated Current Mode Control Architecture

synchronize or to synchronize to an external clock.

•

Wide Bandwidth Error Amplifier

The LM5576Q0 ensures robustness with cycle-by-

•

Built-In Protection

cycle current limit, short-circuit protection, thermal

shut-down, and remote shut-down. The device is

available in a power enhanced TSSOP-20 package

APPLICATIONS

featuring an exposed die attach pad for thermal

•

Automotive

dissipation. The LM5576Q0 is supported by the full

•

Industrial

suite of WEBENCH® On-Line design tools.

PACKAGE

•

TSSOP-20EP (Exposed Pad)

SIMPLIFIED APPLICATION SCHEMATIC

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

SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments Incorporated.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, 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.