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LM2657MTCX Datasheet

  • LM2657MTCX

  • Dual Synchronous Buck Regulator Controller

  • 26頁

  • NSC

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LM2657 Dual Synchronous Buck Regulator Controller
January 2005
LM2657
Dual Synchronous Buck Regulator Controller
General Description
The LM2657 is an adjustable 200kHz-500kHz dual channel
voltage-mode controlled high-speed synchronous buck
regulator controller ideally suited for high current applica-
tions. The LM2657 requires only N-channel FETs for both
the upper and lower positions of each 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) reducing the input capacitor
and filter requirements. The input voltage range is 4.5V 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, and chip Enable.
Features
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Input voltage range from 4.5V to 28V
Synchronous dual-channel interleaved switching
Forced-PWM or Pulse-skip modes
Lossless bottom-side FET current sensing
Adaptive duty cycle clamp
High current N-channel FET drivers
Low shutdown supply current
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
Switching frequency adjustable 200kHz-500kHz
TSSOP-28 package
Applications
n
Low Output Voltage High-Efficiency Buck Regulators
Typical Application (Channel 2 in parenthesis)
20134704
漏 2005 National Semiconductor Corporation
DS201347
www.national.com

LM2657MTCX 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 4.5 V to 28 V

  • 0.6 V

  • 20 A

  • 2

  • + 125 C

  • SMD/SMT

  • TSSOP-28

  • - 40 C

  • Reel

  • 2500

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