LM2652MTC NSC [National Semiconductor], LM2652MTC Datasheet

LM2652MTC

Manufacturer Part Number

LM2652MTC

Description

1.5A, Dual High Performance Synchronous Buck Regulator

Manufacturer

NSC [National Semiconductor]

Datasheet

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LM2652

1.5A, Dual High Performance Synchronous Buck

Regulator

General Description

The LM2652 is a monolithic dual synchronous buck regula-

tor designed for low output voltages. Special attention to

power sequencing, voltage accuracy and start-up character-

istics has been made to enable a simple solution to the

challenging requirements of FPGA & DSP power. Four inte-

grated FET power switches ensure high efficiency, minimal

external components and maximum ease-of-use. The IC can

accept an input of 2.7V to 5.5V and deliver 1.5A per channel.

The bias and power inputs can run from different rails to

balance system power. Output voltages are factory program-

mable from 0.8V to 3.3V in 50mV steps. The LM2652 is

available in two switching frequency options (650kHz and

1300kHz) and both options can be synchronized to an ex-

ternal clock of 300-1600kHz. The two switching channels run

180˚ out of phase to reduce input capacitor size and cost.

Output fault protection is provided by the use of cycle-by-

cycle current limit and frequency fold-back. Separate soft-

start, power good flags and output enables allow for power

sequencing flexibility.

Typical Application

DS201172

Features

n Dual 1.5 Amp outputs

n Output voltage factory set in 50mV steps from 0.8V to

n Input voltage from 2.7V to 5.5V

n 2% reference accuracy

n 4 internal 80mΩ synchronous switches

n 180˚ out of phase operation

n Independent enables (CMOS compatible)

n Separate Power Good flags

n 650kHz or 1300kHz switching frequency

n PLL synchronization to an external clock

n Programmable soft-start

n Supports all-ceramic output capacitors

n TSSOP-28 Exposed Pad package

n Current limit and thermal shutdown protection

Applications

n Cable Modems

n xDSL Modems

n DSP, FPGA and microprocessor power

n Local Regulation

n Set-Top Box

3.3V

ADVANCE INFORMATION

January 2005

20117201

www.national.com

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LM2652MTC Summary of contents

Page 1

LM2652 1.5A, Dual High Performance Synchronous Buck Regulator General Description The LM2652 is a monolithic dual synchronous buck regula- tor designed for low output voltages. Special attention to power sequencing, voltage accuracy and start-up character- istics has been made to ...

Page 2

Connection Diagram Pin Descriptions SW1 (Pins 1, 28): The switch node pins for Channel 1. Connect the Channel 1 output inductor to these pins. PVIN1 (Pins 2, 3): Input voltage supply for the Channel 1 switch split-rail system, ...

Page 3

... English www.national.com Français Tel: +33 ( 8790 28-Lead Plastic (TSSOP Exposed Pad) Order Number LM2652MTC NS Package Number MXA28A 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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