Datasheet > LM2647

LM2647

更新时间： 2024-11-24 02:58:39

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LM2647 Dual Synchronous Buck Regulator Controller

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LM2647 数据手册

LM2647

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SNVS210F –JUNE 2003–REVISED APRIL 2013

LM2647 Dual Synchronous Buck Regulator Controller

Check for Samples: LM2647

FEATURES

DESCRIPTION

The LM2647 is an adjustable 200-500kHz dual

channel voltage-mode controlled high-speed

•

Input Voltage Range from 5.5V to 28V

Synchronous Dual-channel Interleaved

Switching

synchronous buck regulator controller ideally suited

for battery powered applications 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 reduce peak currents under abnormal

•

Forced-PWM or Pulse-skip Modes

Lossless Bottom-side FET Current Sensing

Adaptive Duty Cycle Clamping

High Current N-channel FET Drivers

Low Shutdown Supply Currents

Reference Voltage Accurate to Within ±1.5%

Output Voltage Adjustable down to 0.6V

Power Good flag and Chip Enable

Under-voltage Lockout

Over-voltage/Under-voltage Protection

Soft-start and Soft-shutdown

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.

Switching Frequency Adjustable 200kHz-

500kHz

APPLICATIONS

Standard supervisory and control features include

Soft-start, Power Good, output Under-voltage and

Over-voltage protection, Under-voltage Lockout, Soft-

shutdown and Enable.

•

Notebook Chipset Power Supplies

Low Output Voltage High-Efficiency Buck

Regulators

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...42

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与LM2647相关器件

型号	品牌	获取价格	描述	数据表
LM2647_15	TI	获取价格	LM2647 Dual Synchronous Buck Regulator Controller
LM2647LQ	NSC	获取价格	Dual Synchronous Buck Regulator Controller
LM2647LQ/NOPB	TI	获取价格	LM2647 Dual Synchronous Buck Regulator Controller
LM2647LQX	NSC	获取价格	Dual Synchronous Buck Regulator Controller
LM2647LQX/NOPB	TI	获取价格	Dual Synchronous Buck Regulator Controller 28-WQFN -5 to 125
LM2647MTC	NSC	获取价格	Dual Synchronous Buck Regulator Controller
LM2647MTC	TI	获取价格	DUAL SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, PDSO28, TSSOP-28
LM2647MTC/NOPB	TI	获取价格	LM2647 Dual Synchronous Buck Regulator Controller
LM2647MTCX	NSC	获取价格	Dual Synchronous Buck Regulator Controller
LM2647MTCX	TI	获取价格	DUAL SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, PDSO28, TSSOP-28

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