LM2657MTCX datasheet(1/26 Pages) NSC

部件名	LM2657MTCX

功能描述	Dual Synchronous Buck Regulator Controller

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制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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LM2657

Dual Synchronous Buck Regulator Controller

General Description

The LM2657 is an adjustable 200kHz-500kHz dual channel

voltage-mode controlled high-speed synchronous buck

regulator controller ideally suited for high current applica-

tions. The LM2657 requires only N-channel FETs for both

the upper and lower positions of each stage. It features line

feedforward to improve the response to input transients. At

very light loads, the user can choose between the high-

efficiency Pulse-skip mode or the constant frequency

Forced-PWM mode. Lossless current limiting without the use

of external sense resistors is made possible by sensing the

voltage drop across the bottom FET. A unique adaptive duty

cycle clamping technique is incorporated to significantly re-

duce peak currents under abnormal load conditions. The two

independently programmable outputs switch 180˚ out of

phase (interleaved switching) reducing the input capacitor

and filter requirements. The input voltage range is 4.5V to

28V while the output voltages are adjustable down to 0.6V.

Standard supervisory and control features include Soft-start,

Power Good, output Under-voltage and Over-voltage protec-

tion, Under-voltage Lockout, and chip Enable.

Features

n

Input voltage range from 4.5V to 28V

n

Synchronous dual-channel interleaved switching

n

Forced-PWM or Pulse-skip modes

n

Lossless bottom-side FET current sensing

n

Adaptive duty cycle clamp

n

High current N-channel FET drivers

n

Low shutdown supply current

n

Reference voltage accurate to within ±1.5%

n

Output voltage adjustable down to 0.6V

n

Power Good flag and Chip Enable

n

Under-voltage lockout

n

Over-voltage/Under-voltage protection

n

Soft-start

n

Switching frequency adjustable 200kHz-500kHz

n

TSSOP-28 package

Applications

n

Low Output Voltage High-Efficiency Buck Regulators

Typical Application (Channel 2 in parenthesis)

20134704

January 2005

DS201347

www.national.com

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Texas Instruments	LM2657MTCX/NOPB	1Mb / 36P	[Old version datasheet] LM2657 Dual Synchronous Buck Regulator Controller

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