Monolithic Power Systems Inc. EV8759-D-00A

Overview

EV8759-D-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP8759 synchronous buck converter, a fully-integrated 26V-input, 8A-output DC/DC regulator with constant-on-time control. It operates at 700kHz switching frequency, delivers 1V output from 12V input, and features 117μA quiescent current, adaptive COT loop, and integrated thermal/OCP/OVP/UVP protection.

For engineers reviewing the EV8759-D-00A datasheet, EV8759-D-00A pinout, EV8759-D-00A application, or EV8759-D-00A equivalent, this board enables rapid validation of MP8759 performance in high-current, low-IQ point-of-load designs for laptops, tablets, and distributed power systems under real-world transient and thermal conditions.

Technical Context

The EV8759-D-00A implements the MP8759GD QFN-12 (2mm×3mm) IC in a fixed 1V output configuration using R1=48.7kΩ and R2=66.5kΩ feedback divider. Input voltage is set to 12V with 22μF×2 input capacitance and 0.68μH shielded inductor rated for 20A saturation current.

Test conditions are standardized at TJ=+25°C with VIN=12V, VOUT=1V, and L=0.68μH; load transient response (4A→8A), startup/shutdown waveforms, short-circuit recovery, and output ripple (<10mVpp AC-coupled) are all captured and documented per Rev. 1.1 test report.

Key Specifications

Availability

EV8759-D-00A is available at Aetrix Electronics and suitable for laptop computer power validation, tablet PC point-of-load development, and networking system DC/DC prototyping requiring stable component supply, traceable sourcing, and documented thermal/transient performance data.

Supply support for EV8759-D-00A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP8759 product line targets high-efficiency, low-IQ synchronous buck conversion for space-constrained, thermally demanding applications such as mobile computing and infrastructure power rails, emphasizing fast transient response and minimal external component count.

FAQ

What is the primary purpose of the EV8759-D-00A?

The EV8759-D-00A is a dedicated evaluation board for the MP8759 synchronous buck converter IC. It provides a fully assembled, tested reference design enabling engineers to validate efficiency, thermal behavior, load transient response, and protection functionality under real operating conditions without custom PCB development.

Can the output voltage be adjusted on this board?

Yes - the output voltage is set by resistors R1 (48.7kΩ) and R2 (66.5kΩ) in the feedback network. To change VOUT, replace R1 and/or R2 per the MP8759 datasheet's voltage divider equation: VOUT = 0.6V × (1 + R1/R2). The board layout accommodates 0603 resistor footprints for easy modification.

What input voltage range does the EV8759-D-00A support?

The board is configured for 12V input but supports the full MP8759 operating range of 4.5V to 26V. When using input voltages outside 12V, the EN resistor divider (R5, R8) must be recalculated per the MP8759 UVLO specification to ensure proper enable threshold and hiccup-mode startup reliability.

Which components define the power stage on this board?

The power stage consists of the MP8759GD IC (QFN-12), Wurth 744311068 0.68μH inductor (20A saturation current), and four parallel 22μF/6.3V X5R ceramic output capacitors (C2C–C2F). Input filtering uses two 22μF/35V ceramics (C1A/C1B) and one 100nF ceramic (C1C).

Does the board include thermal management provisions?

Yes - the MP8759GD is mounted directly over a large internal GND/PGND copper pour, with thermal vias connecting top-layer pads to inner and bottom ground planes. The board's 8.55cm × 8.55cm footprint and 1.6cm height allow for forced-air or natural convection cooling during 8A continuous operation testing.

How is enable functionality implemented?

Enable is controlled via the EN pin (U1 Pin 3), accessible through a test point. A logic-high signal (≥1.2V) turns on regulation; logic-low disables the converter. R5 (1.5MΩ) and R8 (100kΩ) form a voltage divider that sets the default enable threshold - values must be scaled for non-12V inputs per the MP8759 UVLO specification.