LM2743MTCSLASHNOPB datasheet(19/44 Pages) TI2

19 / 44 page

BOOT

ISEN

PGND

VCC

PWGD

FREQ

SS/TRACK

SGND

EAO

PGND

VCC = 3.3V

VIN = 3.3V

VOUT = 1.2V@4A

RFB2

CC2

RC1

RCS

CSS

RFADJ

RCC

CCC

CBOOT

CIN1,2

CC1

RFB1

CO1,2

LM2743

RC2

CC3

RPULL-UP

LM2743

www.ti.com

SNVS276I – APRIL 2004 – REVISED FEBRUARY 2019

Product Folder Links: LM2743

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM2743 is a voltage-mode, high-speed synchronous buck regulator with a PWM control scheme. It is

designed for use in set-top boxes, thin clients, DSL/Cable modems, and other applications that require high-

efficiency buck converters. Use the following design procedure to select component values for the LM2743

device. Use the WEBENCH to generate a complete design (see Custom Design With WEBENCH® Tools.

8.2 Typical Applications

8.2.1 Synchronous Buck Converter Typical Application using LM2743

Figure 30. 3.3 V to 1.2 V at 4 A, fSW = 300 kHz

8.2.1.1 Design Requirements

The following section provides a step-by-step design guide of a voltage-mode synchronous buck converter using

the LM2743. This design converts 3.3 V (VIN) to 1.2 V (VOUT) at a maximum load of 4 A, with an efficiency of

89% and a switching frequency of 300 kHz. The same procedures can be followed to create many other designs

with varying input voltages, output voltages, and load currents.

8.2.1.2 Detailed Design Procedure

8.2.1.2.1

Custom Design With WEBENCH® Tools

Click here to create a custom design using the LM2743 device with the WEBENCH® Power Designer.

1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.

2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.

3. Compare the generated design with other possible solutions from Texas Instruments.

The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time

pricing and component availability.

In most cases, these actions are available:

•

Run electrical simulations to see important waveforms and circuit performance

•

Run thermal simulations to understand board thermal performance

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