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LM2647MTCX Datasheet

  • LM2647MTCX

  • Dual Synchronous Buck Regulator Controller

  • 26頁

  • NSC

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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 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藲 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
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Input voltage range from 5.5V to 28V
Synchronous dual-channel Interleaved switching
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
鹵
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
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
漏 2003 National Semiconductor Corporation
DS200563
www.national.com

LM2647MTCX 產品屬性

  • National Semiconductor (TI)

  • 5.5 V to 28 V

  • 0.6 V to 5 V

  • 20 A

  • 2

  • + 125 C

  • SMD/SMT

  • TSSOP-28

  • - 5 C

  • Reel

  • 2500

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