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 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
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 protection, Under-voltage Lockout, Soft-shutdown and Enable.
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