- MP6908A
MP6908A
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Description
The MP6908A is a low-drop diode emulator IC that, when combined with an external switch, replaces Schottky diodes in high-efficiency flyback converters. The MP6908A regulates the forward drop of an external synchronous rectifier (SR) MOSFET to about 40mV, which switches off once the voltage becomes negative.
The MP6908A can generate its own supply voltage for battery charging applications with a potential low output voltage. The MP6908A can also generate this voltage at short-circuit output conditions or high-side SR configurations. Programmable ringing detection circuitry prevents the MP6908A from turning on falsely at VDS oscillations during discontinuous conduction mode (DCM) and quasi-resonant operation.
The MP6908A is available in a space-saving TSOT23-6 package.
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Features & Benefits
- Supports DCM, CCM, Quasi-Resonant Operations and Active Clamp Flyback
- Supports up to 600kHz Switching Frequency
- Wide Output Range down to 0V, No Short Circuit Current Flows through Body Diode
- No Need for Auxiliary Winding for High-Side or Low-Side Rectification
- Ringing Detection Prevents False Turn-On during DCM and Quasi-Resonant Operations
- Works with Standard and Logic Level SR MOSFETs
- Compatible with Energy Star Standards
- ~30ns Fast Turn-Off and Turn-On Delay
- ~100µA Quiescent Current
- Supports both High-Side and Low-Side Rectification
- Available in a TSOT23-6 Package

Active Part Numbers:
MP6908AGJ-P MP6908AGJ-Z
Part numbers ending in P and Z are the same parts. P and Z only indicates reel size.
Meaning of P & Z
MP6908A Resources
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ARTICLE
HOW TO DESIGN AN ULTRA-WIDE INPUT VOLTAGE RANGE FLYBACKARTICLEIn modern technology, the flyback converter is one of the most widely used topologies for domestic and industrial applications that require an auxiliary power supply. Because flyback topology is so popular, designers often attempt to create a unified, single design for an ultra-wide input voltage (VIN) range. This type of design allows flybacks to be used to their maximum functionality while avoid...
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ARTICLE
DESIGNING A SYNCHRONOUS RECTIFICATION SOLUTION TO REDUCE EXCESSIVE HEAT (PART II)ARTICLEThis article is the second part of a two-part series exploring how to design a secondary-side synchronous rectifier for ultra-small, fast charge adapters. Part I discussed the topology designs and power supplies for synchronous rectifiers. Part II will review how a synchronous rectifier opens and shuts down, and how new devices utilize quick shutdown technology. A self-powered circuit provides ...
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PRODUCT CATEGORY
AC-DC PRODUCT SELECTORPRODUCT CATEGORY -
APPLICATION
<120WAPPLICATIONAC/DC power supplies must deliver high-efficiency power conversion for a variety of consumer, industrial, and commercial applications. Power supplies under 120W require ultra-low standby power and high levels of integration to meet the various regulations and requirements of their many applications. Our broad portfolio of solutions includes PFC controllers, flyback controllers, and flyback synchr...
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APPLICATION
<70WAPPLICATIONAC/DC power supplies must deliver high-efficiency power conversion for a variety of consumer, industrial, and commercial applications. Power supplies under 70W require ultra-low standby power and high levels of integration to meet the various regulations and requirements of their many applications. Our broad portfolio of solutions includes flyback controllers, flyback regulators, and flyback sync...
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PRODUCT CATEGORY
SYNCHRONOUS RECTIFIERS FLYBACK TOPOLOGYPRODUCT CATEGORY -
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