MAX8655
Highly Integrated, 25A, Wide-Input, Internal MOSFET, Step-Down Regulator
First Step-Down DC-DC Converter with +4.5V to +28V Input Voltage Range
and Up to 1.2MHz Programmable Switching Frequencies
and Up to 1.2MHz Programmable Switching Frequencies
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Overview
Features and Benefits
- 25A Output Current
- Integrated Power MOSFETs
- Operates from 4.5V to 25V Supply
- 1% FB Voltage Accuracy Over Temperature
- Adjustable Output Voltage Down to 0.7V
- Adjustable Switching Frequency and External Synchronization from 200kHz to 1MHz
- 180° Phase-Shifted Synchronization
- Adjustable Overcurrent Limit
- Adjustable Slope Compensation
- Selectable Current-Limit Mode: Latch-Off orAutomatic Recovery
- Monotonic Output Voltage Rise at Startup into Prebias Output
- Output Sources and Sinks Current for DDR Applications
- Enable Input
- Power-OK (POK) Output
- Adjustable Soft-Start
- Independently Adjustable Overvoltage Protection
Product Details
The MAX8655 synchronous-PWM buck regulator operates from a 4.5V to 25V input and generates an output voltage adjustable from 0.7V to 5.5V at loads up to 25A. Integrated power MOSFETs provide a small footprint, ease of layout, and reduced EMI. Removing the board trace inductances ensures the highest efficiency at high frequency.
The MAX8655 uses peak current-mode control architecture with an adjustable (200kHz to 1MHz), constant-switching frequency, which is externally synchronizable. The MAX8655's adjustable current limit uses the inductor's DC resistance to improve efficiency or an external sense resistor for higher accuracy. Foldback type current limit is available to reduce the power dissipation under severe-overload or short-circuit conditions. A reference input is provided for use with a high-accuracy external reference or for DDR and tracking applications.
Monotonic startup provides safe starting into a prebiased output, where traditional step-down regulators discharge the output capacitor during soft-start, creating a negative voltage at the output and possibly damaging the load.
A 180° out-of-phase synchronization output is available for synchronizing with another MAX8655.
An enable input is provided for on/off control and to facilitate output sequencing. Output-voltage sensing for programmable overvoltage protection is provided and is independent of the feedback network to further enhance the output overvoltage protection.
Overall, the MAX8655 provides enough flexibility for the experienced user, as well as simplicity and ease of use for non-power-supply engineers.
Applications
- IBA Power Supplies
- Networking
- Nonisolated DC-DC Power Modules
- Notebook Computers
- Point-of-Load Power Supplies
- Servers and Workstations
- Telecom Power
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
Tools & Simulations
EE-Sim® Power Tools
The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.
SIMPLIS Models
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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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX8655ETN+ | Material Declaration | Reliability Data | 56-LFCSP-8X8X0.75 | |
| MAX8655ETN+T | Material Declaration | Reliability Data | 56-LFCSP-8X8X0.75 | |
| MAX8655ETN/GG8 | Material Declaration | Reliability Data | N/A | |
| Wafer Fabrication Data | MAX8655 Reliability Data |
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