Monolithic Power Systems Inc. EVM3620-Q-00B

Overview

EVM3620-Q-00B from Monolithic Power Systems is an evaluation board for the MPM3620 synchronous step-down Mini-Module regulator, delivering 3.3 V at up to 2 A continuous output from a 4.5–24 V input. It integrates power MOSFETs, inductor, and input/output capacitors in a QFN20 package and supports selectable power-save or forced-PWM operation via the AAM pin. Used for rapid validation of compact DC/DC conversion in space-constrained industrial and telecom systems.

For engineers reviewing the EVM3620-Q-00B datasheet, EVM3620-Q-00B pinout, EVM3620-Q-00B application, or EVM3620-Q-00B equivalent, this board enables functional verification of the MPM3620GQV Mini-Module's load regulation, transient response, efficiency across 5–24 V input, and thermal shutdown behavior under real-world PCB layout conditions.

Technical Context

The EVM3620-Q-00B implements the MPM3620GQV - a fully integrated 2 MHz synchronous buck converter with internal high- and low-side MOSFETs (R_DS(ON) not specified but optimized for <2 A), integrated shielded inductor, and fixed 3.3 V output. It operates in constant-frequency PWM mode by default and switches to power-save mode below light loads when AAM is grounded.

Board-level design includes input filtering (10 µF ceramic), output bulk capacitance (22 µF ceramic), feedback network (160 kΩ/51 kΩ resistors), and EN logic interface (1.4 V turn-on threshold). Thermal shutdown activates at ~150 °C junction temperature, and over-current protection uses hiccup-mode recovery.

Key Specifications

Availability

EVM3620-Q-00B is available at Aetrix Electronics and suitable for industrial controls, medical imaging equipment, telecom power subsystems, and distributed power systems requiring stable component supply and fast prototyping of compact DC/DC solutions.

Supply support for EVM3620-Q-00B 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 MPM3620 product line delivers fully integrated, thermally robust step-down Mini-Modules targeting space-constrained applications where board area, thermal performance, and time-to-test are critical - especially in industrial automation and communications infrastructure.

FAQ

What is the purpose of the AAM pin on the EVM3620-Q-00B?

The AAM pin selects between power-save mode (AAM grounded) and forced-PWM mode (AAM pulled high). In power-save mode, the regulator skips pulses at light loads to reduce quiescent current to 200 µA. Forced-PWM ensures constant 2 MHz switching for predictable EMI and transient response.

Can the output voltage be adjusted on this evaluation board?

Yes. The board ships with a fixed 3.3 V output using a 160 kΩ/51 kΩ resistor divider on the FB pin. To adjust output voltage, replace R1 (160 kΩ) and R2 (51 kΩ) with values calculated per the MPM3620 datasheet equation: V_OUT = 0.8 V × (1 + R1/R2), supporting outputs as low as 0.8 V.

What is the maximum recommended input voltage for reliable operation?

The absolute maximum input voltage is 24 V, and the board is rated for continuous operation across 4.5–24 V. At 24 V input, efficiency drops to ~85% at full 2 A load (per test data), and thermal performance must be validated with actual airflow and PCB copper area.

How does the EN pin function, and what logic levels enable the regulator?

The EN pin is active-high with a 1.4 V typical turn-on threshold and 1.25 V typical turn-off threshold. Driving EN ≥1.4 V enables regulation; ≤1.25 V disables output and places the module in ultra-low-power shutdown (<1 µA I_Q). No external pull-up is required - internal bias is provided.

Is the EVM3620-Q-00B RoHS-compliant and lead-free?

Yes. All components on the EVM3620-Q-00B - including the MPM3620GQV IC, Murata capacitors, and thick-film resistors - are lead-free and comply with the RoHS directive. MPS confirms green status for the MPM3620 family on its official Quality Assurance page.

Does this evaluation board include thermal monitoring or reporting features?

No. The EVM3620-Q-00B does not include thermal sensors or telemetry outputs. Thermal protection is implemented internally in the MPM3620GQV and triggers automatic shutdown above ~150 °C junction temperature. Board-level thermal performance depends on PCB copper area, airflow, and mounting configuration.