Monolithic Power Systems Inc. EV2122-J-00A

Overview

EV2122-J-00A from Monolithic Power Systems is an evaluation board for the MP2122GJ dual synchronous buck regulator IC, designed to demonstrate 1MHz fixed-frequency, dual 2A DC/DC conversion from 2.7–6V input to independently regulated 1.8V and 1.2V outputs with 45µA quiescent current - used in smartphone power rails and portable instrumentation.

For engineers reviewing the EV2122-J-00A datasheet, EV2122-J-00A pinout, EV2122-J-00A application, or EV2122-J-00A equivalent, this board enables rapid validation of MP2122GJ's phase-shifted operation, hiccup-mode short-circuit protection, and low-I_Q performance under real load transients and thermal stress.

Technical Context

The EV2122-J-00A implements a complete reference design for the MP2122GJ TSOT23-8 IC, featuring two independent 1.5µH shielded inductors (Wurth 744312150), parallel 22µF input capacitors (Murata GRM21BR60J226ME39L), and precision feedback networks (R1/R2 = 806k/412k for VOUT1; R4/R5 = 825k/100k for VOUT2) enabling accurate 0.608V–V_IN output adjustment.

It supports 180° out-of-phase switching to reduce input ripple, 100% duty-cycle operation for low-dropout scenarios, and thermal shutdown with automatic recovery - all verified per MP2122GJ's peak-current-mode control architecture and internal 100mΩ/40mΩ MOSFETs.

Key Specifications

Availability

EV2122-J-00A is available at Aetrix Electronics and suitable for smartphone power validation, portable instrument DC/DC qualification, and battery-powered IoT node development requiring stable component supply and fast-turn prototyping support.

Supply support for EV2122-J-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 leadership in DC/DC conversion, motor drivers, and LED lighting controllers.

The EV2122-J-00A belongs to MPS's evaluation board product line, engineered specifically to accelerate adoption of their internally compensated, low-I_Q buck regulators in space-constrained, battery-sensitive applications.

FAQ

What is the primary function of the EV2122-J-00A?

The EV2122-J-00A is a fully assembled evaluation board for the MP2122GJ dual synchronous buck regulator. It provides immediate hardware access to both output channels, enabling engineers to measure efficiency, transient response, thermal behavior, and enable/control timing without designing a custom PCB.

Can the output voltages be adjusted on this board?

Yes - VOUT1 is set to 1.8V via R1 (806kΩ) and R2 (412kΩ); VOUT2 is set to 1.2V via R4 (825kΩ) and R5 (100kΩ). Both outputs are adjustable by replacing these resistors per the MP2122GJ feedback equation: VOUT = 0.608V × (1 + R_top/R_bottom).

Does the board support independent enable control for each channel?

No - the EV2122-J-00A uses a single EN signal (connected to PIN3 of U1) that enables or disables both regulators simultaneously. The MP2122GJ itself does not support per-channel enable; it only provides global enable and power-good indication.

What input capacitance is implemented, and why?

The board uses two 22µF/16V X5R ceramic capacitors (C1 and C2, 0805) placed directly across VIN and PGND (Pins 7 and 5). This configuration meets MP2122GJ's recommended 22–47µF low-ESR input capacitance and minimizes high-frequency switching noise injection into the source.

Is thermal performance characterized on this board?

Yes - the board layout follows MPS's thermal recommendations: exposed pad of U1 (MP2122GJ in TSOT23-8) is soldered to a dedicated GND copper pour, and inductors L1/L2 are spaced to avoid mutual heating. Measured thermal rise is ≤15°C at full 2A/2A load with 200LFM airflow.

Are the inductors shielded, and what is their saturation current?

Yes - both L1 and L2 are Wurth 744312150 shielded power inductors rated at 1.5µH ±20%, 9.57mΩ DCR, and 11.5A saturation current. This exceeds the 2A per channel requirement and ensures stable operation even during 100% duty-cycle conditions.