lm2647mtcx National Semiconductor Corporation, lm2647mtcx Datasheet

lm2647mtcx

Manufacturer Part Number

lm2647mtcx

Description

Dual Synchronous Buck Regulator Controller

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM2647MTCX.pdf (29 pages)

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LM2647

Dual Synchronous Buck Regulator Controller

General Description

The LM2647 is an adjustable 200-500kHz dual channel

voltage-mode controlled high-speed synchronous buck

regulator controller ideally suited for battery powered appli-

cations such as laptop and notebook computers. The

LM2647 requires only N-channel FETs for both the upper

and lower positions of each synchronous 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) to reduce the input capacitor

and filter requirements. The input voltage range is 5.5V 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, Soft-shutdown and Enable.

Typical Application (Channel 2 in parenthesis)

DS200563

See Figure 16 for Expanded View

Features

n Input voltage range from 5.5V 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 clamping

n High current N-channel FET drivers

n Low shutdown supply currents

n Reference voltage accurate to within

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 and Soft-shutdown

n Switching frequency adjustable 200kHz-500kHz

Applications

n Notebook Chipset Power Supplies

n Low Output Voltage High-Efficiency Buck Regulators

20056304

1.5%

www.national.com

June 2005

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