Monolithic Power Systems Inc. EV3418-J-00A

Overview

EV3418-J-00A from Monolithic Power Systems is a 400mA, 1.2MHz synchronous boost converter evaluation board built around the MP3418GJ IC, designed to demonstrate high-efficiency step-up conversion from 0.8V–4V input to a fixed 3.3V output with true output disconnect, inrush limiting, and integrated protection features for battery-powered portable electronics.

For engineers reviewing the EV3418-J-00A datasheet, EV3418-J-00A pinout, EV3418-J-00A application, or EV3418-J-00A equivalent, this board enables rapid validation of MP3418's low-voltage startup (0.8V), 96% peak efficiency, 38μA quiescent current, down-mode operation (VIN > VOUT), and TSOT23-8 footprint compatibility in space-constrained designs.

Technical Context

The EV3418-J-00A implements a current-mode, synchronous step-up topology using the MP3418GJ controller IC, supporting input voltages as low as 0.8V and delivering regulated 3.3V at up to 400mA continuous load. Its 1.2MHz switching frequency enables compact external components including a 6.8μH shielded inductor and 10μF ceramic output capacitor.

Board-level features include programmable output voltage via R2 (365kΩ + 210kΩ divider), EN control logic with 0.7V turn-on threshold, internal soft-start, thermal shutdown (OTP), overvoltage (OVP), and short-circuit protection (SCP). True output disconnect prevents backfeed during shutdown.

Key Specifications

Availability

EV3418-J-00A is available at Aetrix Electronics and suitable for battery-powered medical devices, wireless peripherals, and handheld computing platforms requiring stable component supply, fast prototyping cycles, and validated reference design integration.

Supply support for EV3418-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP3418 product line targets ultra-low-voltage, high-efficiency boost conversion for energy-constrained portable systems-designed specifically for single-cell battery operation with minimal external component count and robust protection integration.

FAQ

What input voltage range does the EV3418-J-00A support?

The EV3418-J-00A supports an input voltage range of 0.8V to 4V, enabling operation directly from partially discharged single-cell batteries including Li-ion, NiMH, and alkaline cells. Startup is guaranteed at 0.8V, and full regulation is maintained across the entire range with no external bias required.

How is the output voltage set on this evaluation board?

The output voltage is set to 3.3V by default using a resistor divider formed by R1 (365kΩ) and R2 (210kΩ), referenced to the MP3418's 1.21V feedback voltage. The formula VOUT = 1.21 × (1 + R2/R1) allows adjustment by changing R2; the board layout accommodates standard 0603 resistors for easy reconfiguration.

Does the board provide true output disconnect?

Yes-the MP3418 IC integrates true output disconnect functionality. When the EN pin is pulled low (<0.1V), the internal switch opens completely, isolating VOUT from VIN and allowing the output to discharge through the load. This prevents backfeed and ensures safe power sequencing in multi-rail systems.

What protection features are implemented on the EV3418-J-00A?

The board implements all protections integrated into the MP3418: overvoltage protection (OVP), short-circuit protection (SCP), thermal shutdown (OTP), inrush current limiting, and internal soft-start. These functions operate autonomously without external components, simplifying system-level safety compliance.

Can the EV3418-J-00A operate when input voltage exceeds output voltage?

Yes-it supports VIN > VOUT "down mode" operation. When input rises above 3.3V, the MP3418 automatically transitions to linear pass-through mode, maintaining regulation while bypassing switching losses. This extends usable battery life in applications where input voltage may drift above nominal output.

What is the physical size and package of the main IC on this board?

The EV3418-J-00A measures 6.35cm × 6.35cm × 1.0cm and uses the MP3418GJ in a TSOT23-8 package (2.9mm × 1.6mm × 0.9mm), a thermally enhanced variant of SOT23-8 with exposed pad for improved heat dissipation in high-current boost applications.