MAX8548

PRODUCTION

Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit 2.7V to 28V Input, 15A, Step-Down, DC-DC Controllers for Desktop and Graphic Card Supplies have Foldback Current Protection

Analog Devices MAX8548 Product Info

10 February 2026 6

Features

2.7V to 28V Input Range
Foldback Short-Circuit Protection
No Additional Bias Supply Needed
0.8V to 0.83 x V_IN 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

Part details & applications

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 V_IN. These devices can provide efficiency up to 95%. Lossless short-circuit and current-limit protection is provided by monitoring the R_DS(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

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