MAX8545EUB+

The MAX8545EUB+ is a low cost, wide input range, step-down controller with foldback current limit in 10 pin µMAX package. It drives low cost N-channel MOSFETs for both the high-side switch and synchronous rectifier & require no external current sense resistor. Lossless short circuit and current-limit protection is provided by monitoring the RDS(ON) of the low-side MOSFET. It has a current-limit threshold of 320mV. Device features foldback-current capability to minimize power dissipation under short circuits. Pulling the COMP/EN pin low with an open-collector or low-capacitance, open-drain device can shut down device. IC is compatible with low cost aluminium electrolytic capacitors. Input undervoltage lockout prevents proper operation under power-sag operations to prevent external MOSFETs from overheating. Internal soft start is included to reduce inrush current. It is used in set-top boxes, telecom power supplies, cable modems & routers, graphic card and video supplies.

• Supply voltage range is 2.7V to 28V
• Operating temperature range from -40°C to 85°C
• Foldback short circuit protection, low cost external components
• No additional bias supply needed, all n-channel MOSFET design
• 0.8V to 0.83 x VIN output
• Up to 95% efficiency
• Adaptive gate drivers eliminate shoot through
• Switching frequency of 300KHz
• Pin-compatible with the MAX1967
• Thermal shutdown

Applications

Power Management, Industrial, Portable Devices

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party