Monolithic Power Systems Inc. EV9473-L-00A

Overview

EV9473-L-00A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MP9473GL synchronous step-down converter, delivering 3.3V at up to 3.5A from a 4.5–36V input. It integrates proprietary switching-loss-reduction technology, operates at 500kHz, and features programmable soft-start, low-dropout mode, and comprehensive protection (SCP/OCP/UVP/thermal shutdown).

For engineers reviewing the EV9473-L-00A datasheet, EV9473-L-00A pinout, EV9473-L-00A application, or EV9473-L-00A equivalent, this board enables rapid validation of high-efficiency 36V-input DC/DC conversion in USB power supplies, cigarette lighter adapters, and consumer charger designs-supporting fast transient response, stable 1.5% reference accuracy, and full thermal and fault monitoring.

Technical Context

The EV9473-L-00A implements the MP9473GL IC in a fixed 3.3V output configuration with external compensation components optimized per MPS Application Note AN-108. Input voltage range (4.5–36V) and 500kHz switching frequency are hardware-configured via R5/R8 UVLO divider and internal oscillator, not software-programmable.

Board-level design includes dual 10μF/50V input capacitors (C1A/C1B), 22μF/16V output bulk capacitance (C2A/C2B), 5.6μH shielded inductor (XAL6060-562ME), and precision feedback resistors (R1=31.6kΩ, R2=10kΩ) setting VFB=0.815V for regulated 3.3V output.

Key Specifications

Availability

EV9473-L-00A is available at Aetrix Electronics and suitable for USB power supplies, cigarette lighter adapters, and consumer charger designs requiring stable component supply, pre-validated layout, and production-ready thermal performance.

Supply support for EV9473-L-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, motor drivers, and LED lighting controllers.

The MP9473 product line targets high-efficiency, wide-input industrial and automotive power supplies, emphasizing fast transient response, integrated MOSFETs, and robust protection in compact QFN packages.

FAQ

What input voltage range does the EV9473-L-00A support?

The board accepts 4.5V to 36V DC input, verified per MP9473GL specifications. This range accommodates 12V automotive systems, 24V industrial rails, and universal AC/DC adapters. UVLO threshold is set by resistor divider R5/R8 to ~7.2V nominal turn-on (R5=499kΩ, R8=0Ω default), ensuring reliable startup across varying source conditions.

Can the output voltage be adjusted, and how?

Yes, the output voltage is adjustable via the feedback resistor divider (R1/R2). With R2 fixed at 10kΩ, R1 is calculated using VOUT = 0.815V × (1 + R1/R2); for example, 5V output requires R1 ≈ 61.2kΩ. Compensation components (C4, R4, C5) must be recalculated per MPS AN-108 when changing VOUT to maintain stability.

Does the board include power-good signaling?

Yes, the PGOOD pin (U1 Pin 6) provides an open-drain output that asserts high when VOUT is within ±10% of regulation and all faults are cleared. It drives a 10kΩ pull-up on-board and is compatible with microcontroller enable sequencing or system status monitoring without additional level-shifting.

What thermal performance can be expected at full load?

At 24V input and 3.5A output, the MP9473GL junction temperature rise is ≤35°C above ambient (measured per Rev. 1.1 test report), enabled by the 3×4mm QFN package, internal 65mΩ/30mΩ MOSFETs, and 2-layer PCB copper pour. No heatsink is required under free-air convection at TA ≤50°C.

Is the EN pin functional, and what logic levels activate it?

Yes, the EN pin (U1 Pin 5) controls regulator startup/shutdown. Drive EN ≥1.25V to enable; drive EN ≤0.86V to disable. The board includes no pull-up/pull-down by default, allowing direct connection to MCU GPIO or external bias networks for precise power sequencing control.

Are test waveforms and layout files provided?

Yes, the official EV9473-L-00A Rev. 1.1 document includes oscilloscope waveforms for startup, shutdown, load transients, short-circuit response, and power-good timing. Gerber files and schematic PDF are available on the MPS website under "Design Resources" for EV9473-L-00A, supporting custom derivative designs.