Monolithic Power Systems Inc. EV9442-J-00A

Overview

EV9442-J-00A from Monolithic Power Systems is a fully assembled, functional evaluation board for the MP9442GJ synchronous step-down converter IC, delivering 3.3V/2A output from 4–36V input, featuring 600kHz fixed switching frequency, Power Good (PG) indicator, and TSOT23-8 footprint validation. It supports automotive cold-crank operation and includes all critical passives-10µH shielded inductor, 22µF ×2 output capacitors, and precision feedback resistors-for immediate bench testing of 3.3V rail generation in embedded power systems.

For engineers reviewing the EV9442-J-00A datasheet, EV9442-J-00A pinout, EV9442-J-00A application, or EV9442-J-00A equivalent, this board enables rapid validation of MP9442GJ performance under real load transients, thermal stress, efficiency vs. VIN variation (12V/24V/30V), PG assertion timing, EN/SYNC control behavior, and layout-sensitive high-current switching node integrity.

Technical Context

The EV9442-J-00A implements the MP9442GJ's current-mode control architecture with internal 90mΩ/55mΩ MOSFETs, enabling stable regulation across 0–2A load with <1% output voltage deviation at full load. Its fixed 600kHz switching frequency balances EMI suppression and inductor size, while the BST pin requires a 0.1µF ceramic capacitor to sustain high-side gate drive.

Power Good (PG) asserts when VOUT reaches 90% of target (≥2.97V at 3.3V setpoint) with 10ms delay; EN/SYNC accepts external clocks from 200kHz–2.2MHz for synchronization or PWM dimming control. The board uses a 20Ω BST resistor and 41.2k/13k feedback divider to set 3.3V output with ±1% accuracy.

Key Specifications

Availability

EV9442-J-00A is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor node DC-DC conversion, and distributed 3.3V microcontroller supply applications requiring stable component supply and fast design validation cycles.

Supply support for EV9442-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 expertise in DC-DC conversion, motor drivers, and LED lighting controllers.

The MP9442 product line targets compact, high-efficiency point-of-load regulation in space-constrained automotive and industrial environments, emphasizing wide VIN range, integrated MOSFETs, and robust protection features.

FAQ

What input voltage range is validated on the EV9442-J-00A board?

The board is tested and characterized across 4 V to 36 V input, with documented cold-crank operation down to 4.5 V at full 2 A load. Efficiency curves show >90% at 12 V input and >85% at 24 V input under 2 A load, confirming suitability for 12 V and 24 V automotive systems.

How is the 3.3 V output voltage set and adjusted?

VOUT is set by the R1 (41.2 kΩ) and R2 (13 kΩ) resistor divider on the FB pin, yielding 3.3 V with ±1% accuracy. To adjust output, replace R1 and/or R2 using the formula VOUT = 0.8 V × (1 + R1/R2); the board includes solder pads for alternative resistor placement.

Does the EV9442-J-00A support external clock synchronization?

Yes - the EN/SYNC pin accepts TTL/CMOS-compatible external clock signals from 200 kHz to 2.2 MHz. When driven, the MP9442GJ locks its switching frequency to the external source, enabling EMI reduction and multi-rail synchronization in complex power systems.

What thermal performance can be expected during 2 A continuous operation?

At 12 V input and 3.3 V/2 A output, the MP9442GJ junction temperature rises ~35°C above ambient (measured on board per Rev. 1.0 test report). The TSOT23-8 package and 2-layer PCB with thermal vias provide sufficient dissipation without forced airflow.

Is the Power Good (PG) signal actively driven or open-drain?

PG is an active-pullup, open-drain output. It pulls low when VOUT is within 10% of regulation (≤2.97V at 3.3V); otherwise, it remains high-impedance. A 100 kΩ pull-up to VOUT (as implemented on board) ensures clean logic-level signaling to host processors.

Can the board be used to evaluate different output voltages?

Yes - the feedback network is user-modifiable. Removing R1 and R2 and populating alternate resistors allows output adjustment from 0.8 V to 36 V × 0.8/(0.8+R2), supporting evaluation of 1.2 V, 1.8 V, 5 V, or other common rails with appropriate inductor and capacitor derating.