LM2647MTC datasheet(1/25 Pages) NSC

номер детали	LM2647MTC

подробное описание детали	Dual Synchronous Buck Regulator Controller

PDF	25 Pages

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производитель	NSC [National Semiconductor (TI)]

домашняя страница	http://www.national.com

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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.

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 ±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 and Soft-shutdown

n

Switching frequency adjustable 200kHz-500kHz

Applications

n

Notebook Chipset Power Supplies

n

Low Output Voltage High-Efficiency Buck Regulators

Typical Application (Channel 2 in parenthesis)

20056304

June 2003

DS200563

www.national.com

Аналогичный номер детали - LM2647MTC

производитель	номер детали	датащи	подробное описание детали
Texas Instruments	LM2647MTC/NOPB	3Mb / 42P	LM2647 Dual Synchronous Buck Regulator Controller
Texas Instruments	LM2647MTCX/NOPB	3Mb / 42P	LM2647 Dual Synchronous Buck Regulator Controller

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Аналогичное описание - LM2647MTC

производитель	номер детали	датащи	подробное описание детали
Analog Devices	ADP3171	310Kb / 12P	Synchronous Buck Controller with Dual Linear Regulator Controllers REV.0
National Semiconductor ...	LM2657	959Kb / 26P	Dual Synchronous Buck Regulator Controller
ON Semiconductor	NCP5425	155Kb / 22P	Dual Synchronous Buck Controller January, 2005 ??Rev. 6
Texas Instruments	TPS5618EVM-106	390Kb / 10P	SYNCHRONOUS-BUCK HYSTERETIC REGULATOR CONTROLLER
Semtech Corporation	SC415	763Kb / 30P	Dual Synchronous Buck Controller
ON Semiconductor	NCP5425SOEVB	178Kb / 22P	Dual Synchronous Buck Controller July, 2006 ??Rev. 9
Texas Instruments	LM2647	3Mb / 43P	Dual Synchronous Buck Regulator Controller
	LM2647	3Mb / 42P	LM2647 Dual Synchronous Buck Regulator Controller
	LM2657	1Mb / 36P	LM2657 Dual Synchronous Buck Regulator Controller
ON Semiconductor	NCP5424A	134Kb / 20P	Dual Synchronous Buck Controller August, 2003 ??Rev. 0

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LM2647MTC датащи(PDF) 1 Page - National Semiconductor (TI)

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Аналогичный номер детали - LM2647MTC

Аналогичное описание - LM2647MTC

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