Monolithic Power Systems Inc. EV4470-L-01A

Overview

EV4470-L-01A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ4470GL step-down regulator IC, delivering 3.3V/5A output from a 4.5–36V input with 500kHz switching frequency, internal 40mΩ/20mΩ MOSFETs, and OVP latch protection. It supports fast transient response and stable operation across industrial, automotive, and networking power rails.

For engineers reviewing the EV4470-L-01A datasheet, EV4470-L-01A pinout, EV4470-L-01A application, or EV4470-L-01A equivalent, this board enables rapid validation of MPQ4470GL-based 3.3V POL designs under real load, line, and thermal conditions - including soft-start timing, PGOOD signaling, EN control, and UVLO threshold configuration via external resistors.

Technical Context

The EV4470-L-01A implements a synchronous buck topology using the MPQ4470GL QFN20 (3mm × 4mm) IC, which integrates high-side and low-side power MOSFETs, a 0.815V reference, and proprietary switching-loss-reduction circuitry. Its fixed 500kHz frequency balances efficiency and EMI performance across the full 4.5–36V input range.

Board-level design includes a 10µH shielded inductor (Wurth 7443251000), dual 22µF/16V ceramic output capacitors, input bulk capacitance (2×10µF + 0.1µF), and precision feedback resistors (R1 = 31.6kΩ, R2 = 10kΩ) setting VOUT = 3.3V. EN and PGOOD signals are routed to test points for system-level integration verification.

Key Specifications

Availability

EV4470-L-01A is available at Aetrix Electronics and suitable for notebook I/O power, automotive infotainment supplies, and industrial distributed POL applications requiring stable component supply, quick-turn evaluation, and production-ready reference design validation.

Supply support for EV4470-L-01A 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 and mixed-signal semiconductor company specializing in high-performance power management ICs, with over two decades of innovation in DC/DC conversion, motor drivers, and LED lighting solutions.

The MPQ4470 product line delivers high-efficiency, high-current synchronous buck regulators for space-constrained applications where thermal performance, transient response, and integrated power stage reliability are critical - especially in automotive ADAS, industrial PLCs, and optical transceivers.

FAQ

What input voltage range does the EV4470-L-01A support?

The board accepts 4.5V to 36V DC input, verified per MPS datasheet and test reports. This range covers nominal 12V and 24V systems with margin for transients and dropouts. Input capacitors include 2×10µF/50V X7R (1210) and 0.1µF/50V (0603) for broadband decoupling.

How is the 3.3V output voltage set and trimmed?

VOUT is set by R1 (31.6kΩ) and R2 (10kΩ) forming a resistive divider to the FB pin, targeting 0.815V reference. The resulting 3.3V output is factory-trimmed to ±1% tolerance. Adjusting R1 recalculates VOUT per the formula VOUT = 0.815 × (1 + R1/R2).

Does the EV4470-L-01A include enable and power-good functionality?

Yes - EN is accessible via test point and accepts 1.25V (min) to enable or <0.86V (max) to disable; PGOOD is open-drain, pulled up to 3.3V, and asserts high when VOUT is within ±10% of regulation. Both signals are routed for direct microcontroller interface.

What is the purpose of the resistor divider formed by R5 and R8?

R5 (499kΩ) and R8 (0Ω jumper) configure the input UVLO threshold. With R8 = 0Ω, EN is directly tied to VIN, disabling UVLO. To activate UVLO, replace R8 with a resistor - threshold = 0.86V × (1 + R5/R8), enabling brown-in/brown-out protection for unstable supplies.

Can the EV4470-L-01A be used to evaluate the MPQ4470AGL variant?

No - EV4470-L-01A is specifically populated with MPQ4470GL, which includes OVP latch functionality. The EV4470A-L-01A board uses MPQ4470AGL (no OVP latch). Swapping ICs is not recommended due to differences in internal protection logic and potential startup behavior mismatches.

What thermal performance can be expected at full 5A load?

At VIN = 24V, VOUT = 3.3V, and TA = 25°C, the board sustains 5A continuously with junction temperature <105°C (measured on MPQ4470GL die). Thermal relief is achieved via 4-layer PCB, exposed PGND pads, and thermal vias under the QFN20 package.