LM2648 National Semiconductor, LM2648 Datasheet

LM2648

Manufacturer Part Number

LM2648

Description

Synchronous Step-Down 3-Channel Switching Regulator Controller

Manufacturer

National Semiconductor

Datasheet

1.LM2648.pdf (23 pages)

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Download datasheet (2Mb)

LM2648

Two-Phase, Synchronous Step-Down 3-Channel

Switching Regulator Controller

General Description

The LM2648 consists of two current mode and two voltage

mode synchronous buck regulator controllers providing 3

outputs at a switching frequency of 300kHz.

Each pair of switching regulator controllers operate 180˚ out

of phase. This feature reduces the input ripple RMS current,

thereby significantly reducing the required input capacitance.

The two current mode regulator outputs operate as a dual-

phase, single output regulator for high current applications.

Current-mode feedback control on Channel 3 assures supe-

rior line and load regulation and wide loop bandwidth as-

sures excellent response to fast load transients. Channels 1

and 2 employ voltage-mode feedback control.

The LM2648 features analog soft-start circuitry that is inde-

pendent of the output load and output capacitance. This

makes the soft-start behavior more predictable than tradi-

tional soft-start circuits. Sequential startup is built in and

requires a single capacitor to set the timing.

The LM2648 has over-voltage protection and under-voltage

protection for all outputs. Two additional comparator inputs

(analog and logic level) are provided to shut down the IC for

any user defined protection. The FAULT_DELAY pin allows

delayed shut off time for the IC during an under-voltage or

PROT-IN2 fault. The LM2648 also features an adjustable

UVLO feature.

Block Diagram

DS200596

Features

n Four synchronous buck regulators

n Channel 3: Two-phase, current mode controller

n 4.5V to 18V input range

n Built in sequential startup

n Channels 1 and 2: Independent, 180˚ out of phase

n Single soft start for channels 1 and 2

n Adjustable cycle-by-cycle current limit for each channel

n Adjustable reference current

n Adjustable input under-voltage lockout

n Output over-voltage latch protection

n Output under-voltage protection with delay

n Two comparator inputs for user defined protection - one

n Thermal shutdown

n Self-discharge of output capacitors when the regulator is

n TSSOP package

Applications

n Embedded Computer Systems

n Interactive Games

n Set-top Boxes/Home Gateways

voltage mode controllers

with delay

off

20059690

December 2004

www.national.com

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