Monolithic Power Systems Inc. EV8765-Q-00A

Overview

EV8765-Q-00A from Monolithic Power Systems is an evaluation board for the MP8765GQ synchronous step-down converter, designed to validate 1.05V/6A power delivery from 5–24V input in high-current embedded power rails. It implements Constant-On-Time control, integrates low-R_DS(ON) MOSFETs, and supports remote ON/OFF via ground-referenced EN pin - validated in laptop CPU core voltage regulation.

For engineers reviewing the EV8765-Q-00A datasheet, EV8765-Q-00A pinout, EV8765-Q-00A application, or EV8765-Q-00A equivalent, this board enables rapid validation of MP8765GQ's PFM/PWM mode selection, thermal shutdown behavior, soft-start timing, and load transient response under real-world PCB layout constraints.

Technical Context

The EV8765-Q-00A implements a complete reference design for the MP8765GQ IC, featuring a 1.5µH shielded inductor (Wurth 744311150), 22µF ×2 input ceramic capacitors (GRM32ER61E226KE15L), and precision feedback resistors (R1 = 63.4kΩ, R2 = 82kΩ) setting V_OUT = 1.05V with 1% reference accuracy.

It supports dual operating modes: auto PFM/PWM (MODE pin grounded) or forced PWM (MODE pin floating or tied to V_IN), and includes output discharge (via R9), OCP/OVP/UVP protection, and thermal shutdown - all verified per MPS test conditions at T_J = +25°C, V_IN = 12V, L = 1.5µH.

Key Specifications

Availability

EV8765-Q-00A is available at Aetrix Electronics and suitable for laptop CPU power validation, tablet SoC rail testing, and distributed DC/DC subsystem prototyping requiring stable component supply and documented thermal performance.

Supply support for EV8765-Q-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 analog semiconductor company specializing in high-efficiency power management ICs, with over two decades of expertise in DC/DC conversion and integrated power stages.

The MP8765 product line targets high-current, space-constrained applications such as portable computing and networking equipment, delivering monolithic integration with minimal external components and robust protection.

FAQ

What input voltage range is supported, and what happens outside that range?

The EV8765-Q-00A accepts 5–24V DC input per its MP8765GQ controller specification. Below 5V, the device fails to start due to undervoltage lockout (UVP). Above 24V, internal OVP triggers immediate shutdown to protect the QFN3×3 IC and external MOSFETs.

How is output voltage set, and can it be adjusted?

V_OUT is set to 1.05V by default using R1 = 63.4kΩ and R2 = 82kΩ, forming a resistor divider referenced to the 0.604V internal feedback node. Output voltage can be adjusted by recalculating R1/R2 per the MP8765GQ datasheet equation: V_OUT = 0.604V × (1 + R1/R2).

Does the board support both PFM and PWM modes, and how is mode selected?

Yes - PFM/PWM auto-mode is enabled when MODE pin is grounded (R7 = 0Ω); forced PWM is selected by floating MODE or connecting it to V_IN. This allows trade-off evaluation between light-load efficiency (PFM) and ripple/noise predictability (PWM).

What thermal performance can be expected at full 6A load?

At 12V input, 1.05V/6A output, and 25°C ambient, the MP8765GQ junction temperature rises ~45°C above ambient on the EV8765-Q-00A board, verified via thermal imaging in the official test report (Rev. 1.0, p.4–5).

Is output discharge implemented, and how does it function?

Yes - output discharge is enabled via R9 (499Ω) connected between V_OUT and GND. When the regulator shuts down, this resistor actively discharges residual energy from the output capacitor, reducing V_OUT decay time to <10ms.

Can the EN pin interface directly with standard logic families?

Yes - the EN pin is ground-referenced and compatible with 1.8V, 3.3V, and 5V logic: drive >2.0V to enable, <0.4V to disable. No level-shifting circuitry is required for direct connection to microcontroller GPIO or PMIC sequencers.