LM2647LQX

• The input voltage range is from 5.5V to 28V
• Synchronous dual-channel crossover switch
• Forced PWM or pulse hop mode
• Non-destructive bottom FET current sensing
• Adaptive responsibility cycle clamping
• High-current N-channel FET driver
• Low shutdown supply current
• The reference voltage is accurate to within ± 1.5%
• The output voltage can be adjusted as low as 0.6V
• Power well marked and chip enabled
• Undervoltage locking
• Over-voltage/Under-voltage protection
• Soft start and soft shutdown
• Switching frequency adjustable from 200kHz - 500kHz

illustrate

The LM2647 is an adjustable 200 - 500kHz dual-channel control voltage mode high-speed synchronous buck regulator controller, ideal for battery-powered applications such as notebook computers and notebook computers. The LM2647 requires only N-channel FETs for each synchronization stage at the upper and lower positions. It employs feedforward to improve input transient response. At extremely light loads, users can choose between a constant frequency for high-efficiency pulse skip mode or forced PWM mode. Lossless current limiting is made possible without the use of an external detection resistor by detecting the voltage drop at the bottom FET. The establishment of a unique adaptive duty cycle clamping technology is to significantly reduce peak currents under abnormal load conditions. Two independent programmable output switching stages (staggered switching) 180° to reduce input capacitance and filter requirements. The input voltage range is 5.5V to 28V, while the output voltage can be as low as 0.6V.

Standard supervision and control features include soft start, power good output undervoltage and overvoltage protection, undervoltage latching, soft shutdown, and enable.

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• Laptop chipset power supply
• Low output voltage high efficiency step-down regulator