Overview

Features and Benefits

  • 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

Product Details

The MAX8545/MAX8546/MAX8548 are voltage-mode pulse-width-modulated (PWM), step-down DC-DC controllers ideal for a variety of cost-sensitive applications. They drive low-cost n-channel MOSFETs for both the high-side switch and synchronous rectifier, and require 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 MAX8545 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 condition. 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 µMAX® packages.

Applications

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

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PCN-PDN Information

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