MAX8546EUB

The MAX8546 is a voltage-mode pulse-width-modulated (PWM), step-down DC-DC controller ideal for a variety of cost-sensitive applications. It drives low-cost N-channel MOSFETs for both the high-side switch and synchronous rectifier, and require no external current-sense resistor. This device can supply output voltages as low as 0.8V.

The MAX8546 has a wide 2.7V to 28V input range, and does not need any additional bias voltage. The output voltage can be precisely regulated from 0.8V to 0.83 x VIN. This devices can provide efficiency up to 95%. Lossless shortcircuit and current-limit protection is provided by monitoring the RDS(ON) of the low-side MOSFET. The MAX8546 has a current-limit threshold of 165mV. The device features foldback-current capability to minimize power dissipation under short circuit condition. Pulling the COMP/EN pin low with an open-collector or low-capacitance, open-drain device can shut down the device.

The MAX8546 operates at 300kHz. The MAX8546 is compatible with low-cost aluminum 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. This device is offered in space-saving 10-pin MAX packages.