LM27402 datasheet(1/32 Pages) NSC

Teilenummer	LM27402

Bauteilbeschribung	High Performance Synchronous Buck Controller with DCR Current Sensing

PDF	32 Pages

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Hersteller	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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LM27402

September 2, 2010

High Performance Synchronous Buck Controller with DCR

Current Sensing

General Description

The LM27402 is a synchronous voltage mode DC/DC buck

controller with inductor DCR current sense capability. Sens-

ing the inductor current eliminates the need to add resistive

powertrain elements which increases overall efficiency and

facilitates accurate continuous current limit sensing. A 0.6V

±1% voltage reference enables high accuracy and low volt-

age capability at the output. An input operating voltage range

of 3V to 20V makes the LM27402 suitable for a large variety

of input rails.

The LM27402 voltage mode control loop incorporates input

voltage feed-forward to maintain stability throughout the en-

tire input voltage range. The switching frequency is adjustable

from 200 kHz to 1.2 MHz. Dual high current integrated N-

channel MOSFET drivers support large Q

G, low RDS(ON)

MOSFETs. A power good indicator provides power rail se-

quencing capability and output fault detection. Adjustable

external soft-start capability limits inrush current and provides

monotonic output control during startup. Other features in-

clude external tracking of other power supplies, integrated

LDO bias supply, and synchronization capability. The

LM27402 is offered in a 16 pin eTSSOP package and a 4 mm

x 4 mm 16 pin exposed LLP.

Features

■ Input operating voltage range of 3V to 20V

■ Continuous inductor DCR or shunt resistor current sensing

■ 0.6V ±1% reference (-40°C to 125°C junction

temperature)

■ Output voltage as high as 95% of input voltage

■ Integrated MOSFET drivers

■ Internal LDO bias supply

■ External clock synchronization

■ Adjustable soft-start with external capacitor

■ Pre-biased startup capability

■ Power supply tracking

■ Input voltage feed-forward

■ Power good indicator

■ Precision enable with hysteresis

Applications

■ High current, low voltage FPGA/ASIC DC/DC converters

■ General purpose high current buck converters

■ Telecom, datacom, networking, distributed power

architectures

Typical Application Circuit

30092601

PowerWise® is a registered trademark of National Semiconductor Corporation.

300926

www.national.com

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