Maxim Integrated MAX8546EUB

Description
The MAX8545/MAX8546/MAX8548 are voltage-mode pulse-width-modulated (PWM), step-down DC-DC controllers ideal for cost-sensitive applications. They drive low-cost n-channel MOSFETs for both the high-side switch and synchronous rectifier, requiring no external current-sense resistor. These devices can supply output voltages as low as 0.8V.
The MAX8545/MAX8546/MAX8548 have a wide 2.7V to 28V input range and do not need any additional bias voltage. The output voltage can be precisely regulated from 0.8V to 0.83 x VIN. These devices can provide efficiency up to 95%. Lossless short-circuit and current-limit protection is provided by monitoring the RDS(ON) of the low-side MOSFET. The MAXB545 and MAX8548 have a current-limit threshold of 320mV, while the MAX8546 has a current-limit threshold of 165mV. All devices feature foldback-current capability to minimize power dissipation under short-circuit conditions. Pulling the COMP/EN pin low with an open-collector or low-capacitance, open-drain device can shut down all devices.
The MAX8545/MAX8546 operate at 300kHz and the MAX8548 operates at 100kHz. The MAX8545/MAX8546/MAX8548 are 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. These devices are offered in space-saving 10-pin MAX packages.

Features
2.7V to 28V Input Range
Foldback Short-Circuit Protection
No Additional Bias Supply Needed
0.8V to 0.83 x VIN Output
Up to 95% Efficiency
Low-Cost External Components
No Current-Sense Resistor
All n-Channel MOSFET Design
Adaptive Gate Drivers Eliminate Shoot-Through
Lossless Overcurrent and Short-Circuit Protection
300kHz Switching Frequency (MAX8545/MAX8546)
100kHz Switching Frequency (MAX8548)
Pin-Compatible with the MAX1967
Thermal Shutdown

Applications
Set-Top Boxes
Graphic Card and Video Supplies
Desktops and Desknotes
PCI Express Power Supplies
Telecom Power Supplies
Cable Modems and Routers
Networking Power Supplies
Notebook Docking Station Supplies