General Description

The MAX1875/MAX1876 dual, synchronized, step-down controller generates two outputs from input supplies ranging from 4.75V to 23V. Each output is adjustable from sub-1V to 18V and supports loads of 10A or higher. Input voltage ripple and total RMS input ripple current are reduced by synchronized 180° out-of-phase operation.

Features

♦ Two Independent Output Voltages

♦ 180° Out-of-Phase Operation

♦ 90° Out-of-Phase Operation (Using Two MAX1875/MAX1876s)

♦ Foldback Current Limit

♦ 4.75V to 23V Input Supply Range

♦ 0 to 18V Output-Voltage Range (Up to 10A)

♦ >90 Efficiency

♦ Fixed-Frequency Pulse-Width Modulation (PWM) Operation

♦ Adjustable 100kHz to 600kHz Switching Frequency

♦ External SYNC Input

♦ Clock Output for Master/Slave Synchronization

♦ Soft-Start and Soft-Stop

♦ RST Output with 140ms Minimum Delay (MAX1876)

♦ Lossless Current Limit (No Sense Resistor)

Applications

Network Power Supplies

Telecom Power Supplies

DSP, ASIC, and FPGA Power Supplies

Set-Top Boxes

Broadband Routers

Servers