Microchip PWM Controller, 1 MHz 75V 32-Pin, VQFN

The Microchip constant on-time, dual phase, synchronous buck controller featuring a unique adaptive on-time control architecture with HyperLight Load® and phase shedding features enabled. It operates over an input supply range from 4.5V to 36V and can be used to supply up to 50A of output current. The output voltage is adjustable down to 0.6V with an ensured accuracy of ±1%.

• 0.6V internal reference with ±1% accuracy
• Novel ripple injection method to allow greater than 50% duty cycle operation
• Secondary LDO to improve system efficiency
• Droop feature to support adaptive voltage positioning (AVP) for improved load transient response

Product Features

• Input Voltage Range: 4.5V to 75V
• Input Down to 2V when VDD = 5V from External Supply
• Adjustable Output Voltage from 0.6V to 28V
• 0.6V Internal Reference with ±1% Accuracy
• ±0.5% Reference Accuracy for -40°C to 105°C
• HyperLight Load® and Automatic Phase Shedding
• 100 kHz to 1 MHz Switching Frequency per Phase
• High-Voltage Internal 5V LDO for Single-Supply Operation
• Droop Feature to Support Adaptive Voltage Positioning (AVP)
• Programmable Current Limit and Hiccup Mode Short-Circuit Protection
• Thermal Shutdown with Hysteresis
• -40°C to +125°C Junction Temperature Range
• Programmable Current Limit and Hiccup Mode Short-Circuit Protection
• Remote Sense Amplifier for Tight Output Regulation
• Supports Start-up to Pre-Bias Output
• External Programmable Soft Start to Reduce Inrush Current
• Accurate Current Balancing Between Phases
• Compact Size 5 mm x 5 mm 32-Pin VQFN Package