Monolithic Power Systems Inc. EV8715DN-00A

Overview

EV8715DN-00A from Monolithic Power Systems is an evaluation board for the MP8715DN synchronous step-down converter, configured to deliver 1.2V/4A output from 4.5–21V input at 500kHz with 100% duty cycle support and integrated 120mΩ/50mΩ MOSFETs. It implements all-ceramic capacitor design, external soft-start, power-good indication, and frequency synchronization capability.

For engineers reviewing the EV8715DN-00A datasheet, EV8715DN-00A pinout, EV8715DN-00A application, or EV8715DN-00A equivalent, this board enables rapid validation of MP8715DN performance in µP/ASIC core supply, digital set-top box power rails, cable eMTA DC-DC stages, and telecom equipment point-of-load designs.

Technical Context

The EV8715DN-00A implements a fixed-frequency PWM buck topology using the MP8715DN IC in SOIC-8EP package, with verified 1.2V output regulation across 0–4A load and 5V/12V/21V input conditions. Efficiency reaches 95% at 1.2V/2A with VIN=12V, and maintains ≥85% down to 0.5A under VIN=5V.

Board-level features include adjustable feedback via R1/R2 (4.99kΩ/10kΩ), EN/SYNC pin shared for enable control and external clock synchronization up to 2MHz, and POK signal assertion at ±5% VOUT tolerance. The layout uses thermal vias under U1's exposed pad and optimized high-current paths for L1–C2A–C2B output filtering.

Key Specifications

Availability

EV8715DN-00A is available at Aetrix Electronics and suitable for µP/ASIC core supply validation, digital set-top box power subsystem testing, cable eMTA DC-DC qualification, and telecom equipment PoL development requiring stable component supply and documented reference performance.

Supply support for EV8715DN-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 over two decades of expertise in DC-DC conversion, LED drivers, and motor control solutions.

The MP8715 product line delivers compact, high-efficiency synchronous buck regulators for space-constrained applications demanding wide input range, 100% duty cycle, and robust thermal performance - targeting core/I/O supplies in computing, networking, and consumer electronics.

FAQ

What input voltage range is validated on the EV8715DN-00A board?

The board is fully characterized across 4.5V to 21V input, with efficiency curves provided at 5V, 12V, and 21V. Input bulk capacitance (C1A = 22µF/25V X5R) meets MPS minimum requirements for stability and ripple suppression at full 4A load.

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

VOUT is set to 1.2V by R1=4.99kΩ and R2=10kΩ in the feedback network. It is adjustable: replacing R1/R2 changes the divider ratio per VOUT = 0.8V × (1 + R1/R2); the MP8715DN supports outputs from 0.8V up to VIN with 100% duty cycle capability.

Does the board support external clock synchronization?

Yes - the EN/SYNC pin accepts logic-level square-wave signals up to 2MHz. When driven with an external clock, the MP8715DN synchronizes its 500kHz switching frequency without phase shift or jitter accumulation, enabling noise-sensitive system timing alignment.

What thermal performance can be expected during 4A operation?

At 4A/1.2V with VIN=12V, board surface temperature rise is ≤25°C above ambient (25°C) under free-air convection, verified via IR imaging. The SOIC-8EP package's exposed pad is soldered to a 25mm² copper pour with 6 thermal vias, meeting MPS thermal design recommendations.

Is the power-good (POK) signal active-high or open-drain?

POK is an open-drain output that pulls low when VOUT is within ±5% of regulation. An external pull-up resistor (not populated by default) is required for logic-level interfacing; typical use connects to µP reset or supervisor IC inputs.

Can the board operate in 100% duty cycle mode, and how is it enabled?

Yes - 100% duty cycle is inherent to the MP8715DN architecture when VOUT ≥ VIN − VDS(ON_HS). No configuration is needed; the IC automatically extends high-side on-time to maintain regulation, validated on this board at VOUT=1.2V with VIN as low as 4.5V.

What is the purpose of the NS (Not Stuffed) components listed in the BOM?

NS positions (e.g., C10, D1, R4, J1) provide flexibility for alternate configurations: C10 allows optional input ESD protection; D1 enables asynchronous rectification fallback; R4 supports optional current-sense resistor; J1 permits external enable/sync signal routing.