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General Description

The MAX1858A/MAX1875A/MAX1876A dual, synchronized, step-down controllers generate two outputs from input supplies ranging from 4.5V 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

? 4.5V to 23V Input Supply Range

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

? Adjustable Lossless Foldback Current Limit

? Adjustable 100kHz to 600kHz Switching Frequency

? Optional Synchronization

? Clock Output for Master/Slave Synchronization

? 4 x 90° Out-of-Phase Step-Down Converters (Using Two Controllers, Figure 7)

? Prebias Startup (MAX1875A/MAX1876A)

? Power Sequencing (MAX1858A)

? RST Output with 140ms Minimum Delay (MAX1858A/MAX1876A)

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

Applications

Network Power Supplies

Telecom Power Supplies

DSP, ASIC, and FPGA Power Supplies

Set-Top Boxes

Broadband Routers

Servers

Desknote Computers