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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 396kB) Download   E-Mail

Description

Create a design and simulate with EE-Sim: [MAX8686] The MAX8686 current-mode, synchronous PWM step-down 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.

Key Features		Applications/Uses
Operating Range from 4.5V to 20V Input Supply 1% Reference Voltage Accuracy Over Temperature Reference Input (REFIN) for Output Tracking or System Reference Voltage Adjustable Switching Frequency from 300kHz to 1MHz Single/Multiphase Operation Delivers Up to 25A/200A with Integrated MOSFETs Adjustable Current Limit Monotonic Output Voltage at Startup (Prebias) Output Sink and Source Current Capability Adjustable Soft-Start Thermal-Overload Protection Output Overvoltage Protection Thermally Enhanced 6mm x 6mm TQFN Package (4W)		DDR Memory Module Replacements Networking Equipment POL Power Supplies Servers Telecom Equipment

Diagram

Typical Operating Circuit

Application Notes

Application Note 4456: Understand Thermal Derating Aspects of PWM ICs to Ensure the Best System Performance - MAX8686 Application Note 4596: Improve Two-Phase Buck Converter Performance with a Coupled-Choke Topology - MAX8686

Reliability Reports

Show FIT data for: MAX8686 Request Reliability Report for: MAX8686

Software/Models

Create a MAX8686 schematic and simulate it using EE-Sim.

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-3 of 3

MAX8686	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8686EVKIT+			Active	Land Pattern: Not Available		See data sheet
MAX8686ETL+			Active	TQFN;40 pin;36 mm² Outline Drawing: 21-0177 (PDF) Land Pattern: 90-0085 (PDF) Use pkgcode/variation: T4066M+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8686ETL+T			Active	TQFN;40 pin;36 mm² Outline Drawing: 21-0177 (PDF) Land Pattern: 90-0085 (PDF) Use pkgcode/variation: T4066M+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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