- MP8857
MP8857
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Description
The MP8857 is a synchronous step-down converter with built-in power MOSFETs that is capable of regulating the output voltage (VOUT) across a wide input voltage (VIN) range with high efficiency. It can deliver up to 5A of output current (IOUT) with excellent load and line regulation. The integrated VOUT scaling and adjustable IOUT limit functions meet the USB power delivery (PD) and programmable power supply (PPS) requirements.
The MP8857 supports a 100% duty cycle function to reduce the VIN to VOUT dropout voltage while providing high efficiency. The device implements a PMBus interface that supports flexible design for different applications. It provides a configurable, accurate output constant-current (CC) limit, adjustable output reference from 0.1V to 2.147V, selectable pulse-frequency modulation (PFM) mode/pulse-width modulation (PWM) mode/ultrasonic mode (USM), configurable line drop compensation, soft start (SS), and enable (EN) shutdown discharge, which supports flexible design for different applications.
Full protection features include over-current protection (OCP), over-voltage protection (OVP), under-voltage protection (UVP), and thermal shutdown protection.
The MP8857 is available in a QFN-21 (4mmx4mm) package.
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Features & Benefits
- Buck Converter with Built-In Power MOSFETs
- Wide 4V to 36V Operating Input Voltage (VIN)
- Supports True 100% Duty Cycle Operation
- 0.1V to 36V Output Voltage (VOUT) Range
- Up to 5A of Continuous Output Current (IOUT)
- 1% Internal Accuracy Reference (0.1V to 2.147V Range) with 1mV Resolution via the PMBus Interface
- Ultrasonic Mode (USM) for Light Loads
- Meets USB Power Delivery (PD) Peak Current Capability
- 5% Accurate Output Constant-Current (CC) Limit
- Output Bias Function for VCC Supply
- 450kHz/1MHz Switching Frequency (fSW) with Frequency Dithering
- Output Over-Voltage Protection (OVP), Over-Current Protection (OCP), and Short-Circuit Protection (SCP)
- Over-Temperature (OT) Warning and Shutdown
- Selectable I2C Addresses via the ADD Pin or I2C Register
- PMBus-Configurable Parameters Include:
- Output CC Limit
- Line Drop Compensation
- Pulse-Frequency Modulation (PFM) Mode, Pulse-Width Modulation (PWM) Mode, or USM
- Frequency
- Enable (EN) Shutdown Discharge
- Available in a QFN-21 (4mmx4mm) Package with Wettable Flanks

Active Part Numbers:
MP8857GRE-xxxx-Z MP8857GRE-xxxx-P MP8857GRE-0000-Z MP8857GRE-0000-P
Part numbers ending in P and Z are the same parts. P and Z only indicates reel size.
Meaning of P & Z
MP8857 Resources
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PRODUCT CATEGORY
VIN (MAX) 30V TO 48VPRODUCT CATEGORY -
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