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MAX8686

Maxim Integrated Products
Part Number MAX8686
Manufacturer Maxim Integrated Products
Description DC-DC Converter Delivers Up To 25A Per Phase
Published Jul 25, 2009
Detailed Description 19-4113; Rev 0; 5/08 www.DataSheet4U.com Single/Multiphase, Step-Down, DC-DC Converter Delivers Up to 25A Per Phase Ge...
Datasheet PDF File MAX8686 PDF File

MAX8686
MAX8686

Overview
19-4113; Rev 0; 5/08 www.
DataSheet4U.
com Single/Multiphase, Step-Down, DC-DC Converter Delivers Up to 25A Per Phase General Description The MAX8686 current-mode, synchronous PWM stepdown regulator with integrated MOSFETs operates from a 4.
5V to 20V input supply and generates an adjustable output voltage from 0.
7V to 5.
5V while delivering up to 25A per phase.
The MAX8686 employs a peak current-mode architecture that operates with an adjustable switching frequency from 300kHz to 1MHz.
An adjustable current-limit threshold allows for optimization for different applications with different load currents.
Inductor current sense is achieved either using an external sense resistor or using a lossless inductor current-sense scheme.
The foldback and hiccup current limit reduces the power dissipation during overload or short-circuit conditions and allows for autorecovery when the fault condition is removed.
The MAX8686 offers the ability to start up monotonically even when there is a prebias output voltage.
In addition, an adjustable soft-start capability allows for a controlled turn-on.
The MAX8686 features an accurate 1% reference and offers a reference input that allows for a higher accuracy reference to be used for voltage tracking applications such as DDR memory.
The MAX8686 can be paralleled (up to eight) together in a true multiphase mode to deliver up to 200A of output current.
When operating in this mode, this device achieves better than 10% current balance between phases at full load.
The MAX8686 supports programmable phase shedding to improve system efficiency during light load conditions.
Other features include an enable input and a power-OK (POK) indicator used for power sequencing.
The MAX8686 also features latch overvoltage protection that turns on the low-side MOSFET when the output voltage exceeds 120% of the nominal voltage.
The MAX8686 is offered in a thermally enhanced 40-pin, 6mm x 6mm TQFN package.
Features ♦ Operating Range from 4.
5V to 20V Input Supp...


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