Monolithic Power Systems Inc. EV2174C-G-00A

Overview

EV2174C-G-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP2174C synchronous step-down switcher IC, delivering up to 4A output at 1.2V from a 2.7–5.5V input, operating at 1.1MHz with constant-on-time control and integrated 35mΩ/18mΩ MOSFETs.

For engineers reviewing the EV2174C-G-00A datasheet, EV2174C-G-00A pinout, EV2174C-G-00A application, or EV2174C-G-00A equivalent, this board enables rapid validation of high-efficiency, low-voltage DC/DC conversion in space-constrained portable and storage applications requiring fast transient response and power sequencing support.

Technical Context

The EV2174C-G-00A implements the MP2174C - a fixed-frequency, constant-on-time (COT) controlled buck converter with internal high-side and low-side MOSFETs, enabling fast load-step response without external compensation. It supports forced PWM mode and hiccup-mode short-circuit protection.

This board integrates a 1.0μH, 9A inductor (Wurth 74437324010), 22μF/10μF ceramic input/output capacitors, and precision feedback resistors (R4/R5 = 200kΩ) to configure V_OUT = 1.2V, matching the MP2174C's 0.6V reference and EN/PG pins for power sequencing.

Key Specifications

Availability

EV2174C-G-00A is available at Aetrix Electronics and suitable for portable device power validation, storage drive rail testing, and wireless card DC/DC design requiring stable component supply and rapid prototyping capability.

Supply support for EV2174C-G-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 innovation in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2174C product line targets ultra-compact, high-frequency point-of-load regulation for battery-powered systems where efficiency across light-to-full load and minimal footprint are critical design constraints.

FAQ

What input voltage range is supported by the EV2174C-G-00A?

The board accepts 2.7V to 5.5V DC input, aligned with the MP2174C's operational specification. This range supports single-cell Li-ion (3.0–4.2V), USB-powered (5V), and regulated 3.3V system rails, with proper decoupling using the onboard 22μF/10μF X5R ceramics.

How is the output voltage set on this evaluation board?

V_OUT is fixed at 1.2V using a resistor divider formed by R4 and R5 (both 200kΩ), referencing the MP2174C's 0.6V internal feedback node. The configuration follows the standard equation V_OUT = 0.6V × (1 + R4/R5), and can be modified by replacing R4/R5 to achieve other voltages ≥0.6V.

Does the EV2174C-G-00A support power sequencing?

Yes - the board exposes both EN (enable) and PG (power good) pins. Driving EN >1.2V enables regulation; PG asserts high when V_OUT is within ±10% of target. These signals enable controlled startup/shutdown in multi-rail systems such as SSDs or networking cards.

What inductor is used, and why is its DCR specified?

The board uses Wurth 74437324010: a 1.0μH, 9A saturation current inductor with 27mΩ DCR. This value directly impacts current-sense accuracy, thermal rise under 4A load, and efficiency calculation - especially critical for COT control stability and hiccup-mode fault detection.

Can the EV2174C-G-00A operate in dropout?

Yes - the MP2174C supports 100% duty cycle operation, allowing V_OUT regulation even when V_IN drops to within ~100mV above V_OUT. On this board, that enables stable 1.2V output down to ~1.3V input, useful for brown-out resilience in battery discharge scenarios.

Is soft-start configurable on this evaluation board?

No - the MP2174C features a fixed 0.5ms internal soft-start time, and the EV2174C-G-00A does not provide external soft-start capacitor pads. This ensures repeatable, controlled inrush limiting during power-up without additional components.

What protection features are demonstrated on this board?

The board fully demonstrates MP2174C's short-circuit protection (hiccup mode), thermal shutdown, and auto-discharge at power-off. Transient waveforms in the reference design (pages 5–6) confirm SCP entry/recovery timing and thermal foldback behavior under sustained overload.