Monolithic Power Systems Inc. EVM38111-R-00A

Overview

EVM38111-R-00A from Monolithic Power Systems is an evaluation board for the MPM38111 dual-channel synchronous step-down DC-DC module, designed to demonstrate 1.8V/1.2V dual-output regulation at up to 1A per channel from a 2.7–6V input. It integrates power MOSFETs and inductors in a 4mm × 4mm × 1.6mm QFN14 package, supports 1MHz switching with 180° phase shift, and delivers >93% peak efficiency for portable Li+-battery-powered systems.

For engineers reviewing the EVM38111-R-00A datasheet, EVM38111-R-00A pinout, EVM38111-R-00A application, or EVM38111-R-00A equivalent, this board enables rapid validation of dual-rail power delivery in space-constrained, battery-operated designs requiring low quiescent current (45µA) and hiccup-mode short-circuit protection.

Technical Context

The EVM38111-R-00A implements the MPM38111 IC's full functional interface: EN1/EN2 enable control, FB1/FB2 voltage feedback inputs, and VIN/VOUT1/VOUT2/GND terminals. It operates with fixed 1.8V/1.2V outputs set by onboard 200kΩ/100kΩ resistor dividers, supporting external adjustment via R1–R4.

Test conditions confirm stable operation at VIN = 5V, TA = 25°C, COUT = 10µF per rail, delivering clean 20mVpp output ripple and fast transient response under 1A step load. Phase-shifted operation reduces input capacitance stress and improves thermal distribution across the dual-channel module.

Key Specifications

Availability

EVM38111-R-00A is available at Aetrix Electronics and suitable for portable instrumentation, smart phone power subsystem validation, and battery-powered IoT node development requiring stable component supply and rapid prototyping capability.

Supply support for EVM38111-R-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 and power module integration.

The MPM38111 product line targets space-constrained, battery-operated applications demanding simplified power design-delivering complete dual-output buck solutions in ultra-small QFN modules with minimal external components.

FAQ

What is the purpose of the EVM38111-R-00A evaluation board?

This board is a fully assembled, tested platform for evaluating the MPM38111 dual-channel DC-DC module. It provides immediate access to all critical signals-including EN1/EN2, FB1/FB2, VIN, VOUT1, VOUT2, and GND-for performance characterization, thermal testing, and system integration verification without custom PCB design.

Can output voltages be adjusted, and how?

Yes. VOUT1 is set by resistor divider R1/R2 (200kΩ/100kΩ), and VOUT2 by R3/R4 (200kΩ/100kΩ). The formula VOUT = 0.608V × (1 + R1/R2) applies. Replacing R1 or R3 with precision resistors enables accurate tuning to non-default rails such as 3.3V or 1.0V while maintaining feedback stability.

Does the board support independent enable control for each channel?

Yes. EN1 and EN2 are separate test points allowing independent startup/shutdown sequencing. Applying ≥1.2V to EN1 enables Channel 1 only; applying ≥1.2V to EN2 enables Channel 2 only. This supports staggered power-up in multi-rail SoC applications to manage inrush current.

What thermal performance can be expected during full-load operation?

At VIN = 5V, VOUT1 = 1.8V/1A and VOUT2 = 1.2V/1A, the board achieves >90% efficiency per channel, limiting temperature rise to <25°C above ambient on the MPM38111 QFN14 package under free-air conditions-verified via IR imaging in the official test report (Rev. 1.0, p.4).

Is the board RoHS-compliant and lead-free?

Yes. All components-including the MPM38111 IC, Murata GRM21BR61A106KE19L capacitors, and 0402 film resistors-are lead-free and fully compliant with the EU RoHS directive, as confirmed in the BOM and MPS product compliance documentation.

How is short-circuit protection implemented?

The MPM38111 IC on the board uses cycle-by-cycle over-current detection and hiccup-mode recovery: upon sustained short, the converter shuts down for ~30ms, then attempts restart. This prevents thermal runaway and enables safe fault recovery without external circuitry-demonstrated in waveform tests on page 4 of the reference document.