LM2742

HG

BOOT

LG

PGND

FB

SD

PWGD

FREQ

SS

SGND

EAO

PGND

+5V

2200 PF

6.3V, 2.8A

1.5 PH

6.1A, 9.6 m:

D1

Q1

Q2

10 PF

6.3V

10k

2.2k

10k

392k

2.2p

180p

12n

63.4k

2.2 PF

10:

0.1P

L1

+

Si4884DY

Si4884DY

LM2742

www.ti.com

SNVS266C – MARCH 2004 – REVISED MARCH 2013

LM2742 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages

Check for Samples: LM2742

1

FEATURES

DESCRIPTION

The LM2742 is a high-speed, synchronous, switching

2

•

Input Power from 1V to 16V

regulator controller. It is intended to control currents

•

Output Voltage Adjustable down to 0.6V

of 0.7A to 20A with up to 95% conversion efficiencies.

•

Power Good Flag, Adjustable Soft-start and

Power up and down sequencing is achieved with the

Output Enable for Easy Power Sequencing

power-good flag, adjustable soft-start and output

enable features. The LM2742 operates from a low-

•

Reference Accuracy: 1.5% (0°C–125°C)

current 5V bias and can convert from a 1V to 16V

•

Current Limit Without Sense Resistor

power rail. The part utilizes a fixed-frequency,

•

Soft Start

voltage-mode, PWM control architecture and the

switching frequency is adjustable from 50kHz to

•

Switching Frequency from 50 kHz to 2 MHz

2MHz by setting the value of an external resistor.

•

40ns Typical Minimum On-time

Current limit is achieved by monitoring the voltage

•

TSSOP-14 Package

drop

across

the

on-resistance

of

the

low-side

MOSFET, which enables on-times on the order of

APPLICATIONS

40ns, one of the best in the industry. The wide range

of operating frequencies gives the power supply

•

POL Power Supply Modules

designer the flexibility to fine-tune component size,

•

Cable Modems

cost,

noise

and

efficiency.

The

adaptive,

non-

overlapping MOSFET gate-drivers and high-side

•

Set-Top Boxes/ Home Gateways

bootstrap

structure

helps

to

further

maximize

•

DDR Core Power

efficiency. The high-side power FET drain voltage can

•

High-Efficiency Distributed Power

be from 1V to 16V and the output voltage is

adjustable down to 0.6V.

•

Local Regulation of Core Power

TYPICAL APPLICATION

Figure 1. 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 © 2004–2013, 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.