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LM2647 - Dual Synchronous Buck Regulator Controller

Download the LM2647 datasheet PDF. This datasheet also covers the LM2 variant, as both devices belong to the same dual synchronous buck regulator controller family and are provided as variant models within a single manufacturer datasheet.

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 applications such as laptop and notebook computers.

Key Features

  • line feedforward to improve the response to input transients. At very light loads, the user can choose between the highefficiency 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 load conditions. The two independently programmable outp.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (LM2-647.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
LM2647 Dual Synchronous Buck Regulator Controller Texas Instruments
LM2640 Dual Adjustable Step-Down Switching Power Supply Controller Texas Instruments
LM26400Y 500-kHz Wide Input Range Buck Regulator Texas Instruments
LM2641 Dual Adjustable Step-Down Switching Power Supply Controller Texas Instruments
LM2642 Two-Phase Synchronous Step-Down Switching Controller Texas Instruments

Other Datasheets by National Semiconductor (now Texas Instruments)

Part Number Description
LM2640 Dual Adjustable Step-Down Switching Power-Supply Controller
LM26400Y 500kHz Wide Input Range Buck Regulator
LM2641 Dual Adjustable Step-Down Switching Power Supply Controller
LM2642 Two-Phase Synchronous Step-Down Switching Controller
LM2645 Advanced Two-Phase Switching Controller

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
Dual Synchronous Buck Regulator Controller June 2003 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 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 highefficiency 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.