MAX8686
NOT RECOMMENDED FOR NEW DESIGNSSingle/Multiphase, Step-Down, DC-DC Converter Delivers Up to 25A Per Phase
Programmable Phase-Shedding Capability Improves Efficiency During Reduced Load Conditions
- Part Models
- 2
- 1ku List Price
- Starting From $10.30
Overview
- 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)
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.
Applications
- DDR Memory
- Module Replacements
- Networking Equipment
- POL Power Supplies
- Servers
- Telecom Equipment
Documentation
Data Sheet 1
User Guide 1
Technical Articles 6
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX8686ETL+ | Thin Quad Flatpack, No Leads | ||
| MAX8686ETL+T | Thin Quad Flatpack, No Leads |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Sep 16, 2024 - 2276C WAFER FAB |
||
| MAX8686ETL+ | ||
| MAX8686ETL+T | ||
This is the most up-to-date revision of the Data Sheet.
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ADI Power Studio™ Designer
ADI Power Studio™ Designer is the next-generation tool for IC-level, power supply design, guiding engineers to faster, validated solutions.
Learn MoreEvaluation Kits
Evaluation Kit for the MAX8686
Reference Designs
This fully tested reference design provides a complete solution for powering the Xilinx® Zynq® Extensible Processing Platform (EPP).
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