Monolithic Power Systems Inc. EV2420-F-00A

Overview

EV2420-F-00A from Monolithic Power Systems is an evaluation board for the MPQ2420GF synchronous step-down converter IC, supporting 4.5–75V input and delivering regulated 3.3V/0.3A output. It integrates high-side/low-side MOSFETs (1.2Ω/0.45Ω), programmable soft-start, and a windowed watchdog with selectable short/long timeout modes. Designed for automotive and industrial power systems requiring functional safety redundancy.

For engineers reviewing the EV2420-F-00A datasheet, EV2420-F-00A pinout, EV2420-F-00A application, or EV2420-F-00A equivalent, this board enables rapid validation of MPQ2420GF's high-voltage DC-DC conversion, watchdog-triggered reset behavior, light-load efficiency scaling, and BIAS-assisted regulation in real-world 3.3V rail designs.

Technical Context

The EV2420-F-00A implements the MPQ2420GF IC in TSSOP-16 EP package, featuring integrated 75V-rated power MOSFETs and a dedicated watchdog subsystem with WDI/WDO/MODE/WD_DIS pins. It supports both standard and BIAS-powered operation, enabling >90% peak efficiency at 12V_IN→3.3V_OUT/0.3A with 33µH inductor and dual 22µF output capacitors.

Watchdog functionality includes voltage-monitored power-on reset, programmable timeout via R15 (51kΩ yields ~850ms long-window period), and mode selection between short-window (fast timeout) and long-window (extended monitoring) via the MODE pin. The board routes all critical control signals-including EN, SS, FB, TIMER, and VREF-for external test instrumentation and MCU integration.

Key Specifications

Availability

EV2420-F-00A is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor node regulators, and battery-backed telemetry modules requiring stable component supply and functional safety validation support.

Supply support for EV2420-F-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 analog semiconductor company specializing in high-performance power management ICs, with core expertise in DC-DC conversion, motor drivers, and battery management solutions.

The MPQ2420GF product line targets automotive-grade (AEC-Q100 Grade 1) and industrial applications demanding high-input-voltage resilience, integrated watchdog safety, and ultra-low quiescent current (20µA active, 5µA shutdown).

FAQ

What is the purpose of the BIAS pin on the EV2420-F-00A board?

The BIAS pin powers the internal regulator of the MPQ2420GF IC. When connected to a clean 3.3V–5.5V supply (e.g., the board's own 3.3V output), it reduces switching losses and improves conversion efficiency-especially under light loads. R4 must be removed and R5 installed if using an external BIAS source.

How do I configure the watchdog timeout period?

The timeout is set by resistor R15 on the board. With the default 51kΩ value, the long-window timeout is approximately 850ms, calculated as T = (R15 + 73.5kΩ) × 15.75µs. Adjusting R15 changes the period linearly; values below 30kΩ shift operation into short-window mode.

Can the output voltage be adjusted, and how?

Yes-the board is configured for 3.3V, but output voltage is adjustable via the feedback divider. R6 (1.2MΩ) and R7 (510kΩ) set V_FB = 1V. To change V_OUT, replace R7 using V_OUT = 1V × (1 + R6/R7); recalculate inductor and output capacitor per the MPQ2420GF datasheet when deviating from 3.3V.

What does the /WD_DIS pin do, and what is its default state?

The /WD_DIS pin enables or disables the integrated watchdog. Driving it above 3.2V disables the function; pulling it below 0.8V enables it. When left floating, an internal pull-up activates the watchdog-making it operational by default for safety-critical validation.

Is the EV2420-F-00A board AEC-Q100 qualified?

The board itself is not qualified-but it hosts the MPQ2420GF IC, which is rated AEC-Q100 Grade 1 (−40°C to +125°C ambient). All components on the EV2420-F-00A-including the TDK inductor and Murata capacitors-are selected to meet automotive reliability requirements for evaluation use.

How is enable/disable control implemented on this evaluation board?

Enable is controlled via the EN pin: drive >1.55V to turn on the regulator; drive <1.2V to shut down. When floating, EN is pulled low internally by a 3MΩ resistor, ensuring default disable state-preventing unintended startup during handling or connection.