Monolithic Power Systems Inc. EVM3620A-QV-00A

Overview

EVM3620A-QV-00A from Monolithic Power Systems is an evaluation module for the MPM3620A synchronous step-down DC/DC module, designed to validate 4.5–24 V input to adjustable 0.8–24 V output conversion at up to 2 A continuous current. It integrates power MOSFETs, inductor, VCC and bootstrap capacitors, and supports power-good signaling, thermal shutdown, and over-current hiccup protection. Engineers use it to verify performance in space-constrained industrial and telecom power rails.

For engineers reviewing the EVM3620A-QV-00A datasheet, EVM3620A-QV-00A pinout, EVM3620A-QV-00A application, or EVM3620A-QV-00A equivalent, this board enables rapid validation of MPM3620A's load transient response, efficiency across 5–24 V inputs, soft-start timing, and PG signal behavior under fault conditions-critical for embedded power subsystem qualification.

Technical Context

The EVM3620A-QV-00A implements the full MPM3620A functional block-including integrated 90 mΩ/40 mΩ MOSFETs, 1 µH inductor, internal 4.9 V VCC regulator, and open-drain PG output-with external components limited to input/output capacitors, feedback resistors, and optional RC snubber. It operates across three modes: advanced asynchronous modulation (AAM) below ~300 mA, discontinuous conduction mode (DCM), and continuous conduction mode (CCM) above ~1 A.

Its control architecture features a 0.798 V internal reference, cycle-by-cycle over-current protection with hiccup recovery, thermal shutdown at 150°C (130°C hysteresis), and UVLO with 3.9 V rising threshold. The board supports pre-bias start-up and includes layout-optimized copper planes on SW (pins 4–6) and OUT (pins 7–9) for thermal management.

Key Specifications

Availability

EVM3620A-QV-00A is available at Aetrix Electronics and suitable for industrial controls, medical imaging subsystems, telecom power distribution, and LDO replacement designs requiring stable component supply and fast design validation cycles.

Supply support for EVM3620A-QV-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The EVM3620A-QV-00A belongs to MPS's evaluation platform family for integrated power modules, engineered specifically to accelerate design-in of compact, high-efficiency buck converters in resource-constrained applications.

FAQ

What input and output capacitors are populated on the EVM3620A-QV-00A?

The board uses a 10 µF/25 V X5R 0805 ceramic capacitor at the input (CIN) and dual 22 µF/16 V X5R 0805 capacitors at the output (COUT), matching the "Low VOUT Ripple" configuration from the MPM3620A datasheet Table 1 for 12 V input and 3.3 V output. These values provide <10 mV ripple and <85 mV load transient deviation under 2 A step load.

Does the EVM3620A-QV-00A support pre-biased output start-up?

Yes. The MPM3620A IC on the board implements monotonic pre-bias start-up: when the output voltage is already present at startup, the internal soft-start voltage (VSS) ramps up and only enables switching once VSS exceeds the sensed FB voltage, preventing reverse current flow and ensuring controlled ramp-up without output collapse.

How is thermal performance validated on this evaluation board?

Thermal validation follows JEDEC JESD51-7 4-layer PCB standards. The board uses 2 oz copper on top and bottom layers, thermal vias under PGND (pins 12–14) and SW (pins 4–6), and direct copper pours connecting OUT (pins 7–9) to the load. Measured die temperature stays ≤125°C at 2 A/12 V input with 200 LFM airflow.

Can the PG pin be used for system power sequencing?

Yes. PG is an open-drain output with 1 mA sink capability at 0.4 V. When pulled up to VCC (4.9 V) via 100 kΩ, it asserts high after 35 µs once VFB reaches 90% of 0.798 V (≈0.718 V), and de-asserts low within 80 µs if VFB drops below 83% (≈0.662 V), enabling precise power-good handshaking with microcontrollers or FPGAs.

Is an RC snubber required for EMI compliance?

An optional RC snubber (5.6 Ω + 330 pF) is included in the bill of materials and recommended for improved EMI performance. It clamps switch-node voltage spikes and damps ringing without compromising efficiency-measured reduction in 30–100 MHz emissions exceeds 6 dBµV/m in standard 3 m chamber tests.

What is the minimum output voltage achievable with this board?

The board supports output voltages down to 0.8 V, set by the feedback divider (R1/R2). At 0.8 V, the FB node sees 0.798 V ±0.012 V (±1.5%), meeting datasheet VFB tolerance. For lower outputs, the minimum on-time limit (30 ns) restricts practical operation below 0.8 V unless using external compensation or reduced switching frequency.