Monolithic Power Systems Inc. EVL3437-J-00A

Overview

EVL3437-J-00A from Monolithic Power Systems is a fully assembled evaluation board for the MP3437 synchronous boost converter IC, designed to demonstrate high-efficiency DC-DC voltage step-up from 2.7V–16V input to fixed 8V/2.5A output. It integrates the MP3437GJ in TSOT23-8 package, a 600kHz COT-controlled converter with internal 14mΩ HS-FET and 21mΩ LS-FET, delivering up to 20W peak power from single-cell Li-ion sources in portable audio and POS systems.

For engineers reviewing the EVL3437-J-00A datasheet, EVL3437-J-00A pinout, EVL3437-J-00A application, or EVL3437-J-00A equivalent, this board enables rapid validation of MP3437's auto pass-through mode, adaptive transient response, UVLO configuration, and thermal behavior under real load conditions - critical for battery-powered boost designs requiring >89% efficiency at 3.3V-to-8V conversion.

Technical Context

The EVL3437-J-00A implements the MP3437's constant-off-time (COT) control architecture with cycle-by-cycle current limiting on the low-side MOSFET and integrated high-side switch eliminating external Schottky diodes. Its layout includes an MPS-optimized 1.5μH inductor (MPL-AL6050-1R5), five 22μF X7R ceramic input/output capacitors, and precision feedback resistors (R1 = 750kΩ, R2 = 107kΩ) setting VOUT to 8V via 1V reference.

Board-level features include configurable EN pin control, over-voltage protection (OVP), 150°C over-temperature shutdown, and support for input under-voltage lockout hysteresis tuning. The 6.4cm × 6.4cm × 0.6cm PCB uses standard SMD components (0402–1210) and exposes all key nodes (VIN, VOUT, SW, FB, EN, GND) for probing and modification.

Key Specifications

Availability

EVL3437-J-00A is available at Aetrix Electronics and suitable for notebook power subsystem validation, portable POS system prototyping, and AI speaker reference design development requiring stable component supply and documented test data across input voltage and load transients.

Supply support for EVL3437-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 power management ICs, including DC-DC converters, LED drivers, and motor controllers, with global manufacturing and quality certifications.

The MP3437 product line targets portable and battery-powered applications requiring high integration, fast transient response, and minimal external components - specifically engineered for space- and efficiency-critical boost converter implementations.

FAQ

What is the default output voltage of the EVL3437-J-00A, and how is it set?

The board is factory-configured for 8V output using R1 = 750kΩ and R2 = 107kΩ, leveraging the MP3437's 1V feedback reference (VOUT = VFB × (1 + R1/R2)). This ratio yields exactly 8V and can be recalculated for other outputs by adjusting R2 while maintaining VFB = 1V.

Does the EVL3437-J-00A support auto pass-through mode, and how is it activated?

Yes - when VIN exceeds VOUT-SET (e.g., VIN > 8V), the MP3437 automatically enters pass-through mode, bypassing switching operation to reduce losses. No firmware or external signal is required; activation is purely analog and occurs internally based on input-output voltage comparison.

Can the switching frequency be adjusted on this evaluation board?

No - the MP3437 uses a fixed 600kHz oscillator, and the EVL3437-J-00A does not provide frequency programming pins or external timing components. Frequency variation is not supported; design intent is to validate performance at the specified switching point.

What is the maximum recommended load current, and what limits it?

The board is rated for 2.5A continuous output at 8V with 3.3V input and 25°C ambient. Thermal rise (≤100°C case temperature) and inductor saturation (ISAT = 18A) are primary limits; exceeding 2.5A requires forced airflow or reduced ambient temperature per test data on page 5.

Is the EN pin accessible, and what logic level enables the converter?

Yes - the EN pin is routed to a test point and accepts standard CMOS logic. The device enables when EN ≥ 1.2V (typical) and disables when EN ≤ 0.4V. Pull-up resistor R4 (30kΩ) ensures default-enable operation unless actively pulled low.

Does the board include over-voltage protection, and at what threshold does it trigger?

Yes - the MP3437 provides internal over-voltage protection that triggers when VOUT exceeds ~10.5V (130% of nominal 8V). Upon detection, the high-side FET turns off and the converter enters hiccup mode until fault clears, protecting downstream 8V-rated loads.