Monolithic Power Systems Inc. EVQ4432-L-00A

Overview

EVQ4432-L-00A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ4432 and MPQ4432-AEC1 synchronous step-down DC/DC converters, delivering 5V at up to 2.2A from a 5V–36V input range. It integrates internal 90mΩ high-side and 40mΩ low-side MOSFETs, supports 350kHz–2.5MHz frequency configuration, and implements Advanced Asynchronous Modulation (AAM) for light-load efficiency in automotive and industrial power systems.

For engineers reviewing the EVQ4432-L-00A datasheet, EVQ4432-L-00A pinout, EVQ4432-L-00A application, or EVQ4432-L-00A equivalent, this board enables rapid validation of MPQ4432-based 5V power rails under cold-crank, load-dump, and wide-input-voltage conditions - with configurable soft-start, sync capability, and power-good signaling.

Technical Context

The EVQ4432-L-00A implements the MPQ4432GL IC in QFN-16 (3mm×4mm) package, configured for fixed 5V output using a 41.2kΩ/7.68kΩ feedback divider. It supports both AAM (for <10mA loads) and forced continuous conduction mode (FCCM), selectable via SYNC pin logic level at startup.

Input EMI filtering includes a 22µF electrolytic capacitor (CIN9) and parallel ceramic network; output filtering uses dual 22µF X7R ceramics (C2A/C2B). The board incorporates test points for EN, SYNC, PG, VOUT, and VEMI, plus an optional external frequency spread-spectrum circuit (U2 + C3/R4).

Key Specifications

Availability

EVQ4432-L-00A is available at Aetrix Electronics and suitable for automotive ECU power validation, industrial 24V-to-5V conversion, and embedded system bring-up requiring stable component supply and documented thermal performance under transient conditions.

Supply support for EVQ4432-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The EVQ4432-L-00A belongs to MPS's automotive-grade evaluation board product line, engineered specifically to accelerate qualification of MPQ4432-based power supplies in AEC-Q100 Grade 1 environments - emphasizing cold-crank resilience, EMI robustness, and functional safety readiness.

FAQ

What input voltage transients can the EVQ4432-L-00A withstand during automotive testing?

The board is validated for cold-crank (VIN drop to 3.3V at 0A and 2A load) and load-dump (VIN surge to 36V at 2A load), per test waveforms on pages 12–13 of Rev. 1.1. Input EMI filter (CIN9 + C1A/C1B) suppresses ringing during fast transients, and the MPQ4432's 36V absolute maximum rating ensures safe operation.

How do I configure the EVQ4432-L-00A for 3.3V output?

Replace R7 (41.2kΩ) and R8 (7.68kΩ) with 41.2kΩ and 13kΩ (1%) resistors respectively, per Table 1. Ensure FB node routing remains short and low-noise; no compensation changes are needed as the MPQ4432 uses internal Type II compensation optimized for 40kΩ RFB1.

Does the board support external clock synchronization with phase control?

Yes - drive the SYNC pin with a 350kHz–2.5MHz square wave. Pull SYNC high before startup for in-phase operation; pull low (or float) for 180° out-of-phase. The external clock must exceed the RFREQ-set frequency by ≥250kHz to avoid jitter or unlock behavior.

What is the purpose of the ICM7555IBAZ timer (U2) on the board?

U2 implements an optional frequency spread-spectrum (FSS) circuit that modulates switching frequency to reduce peak EMI. When enabled (JP1 closed), it drives the SS pin with a triangle waveform; CSS = 4.7nF yields 700μs soft-start time, per Figure 2 and page 5.

Can the EVQ4432-L-00A be used to evaluate the MPQ4432-AEC1 variant?

Yes - the board ships with MPQ4432GL but is hardware-compatible with MPQ4432GL-AEC1 (AEC-Q100 Grade 1 qualified). Both share identical pinout, electrical specs, and thermal characteristics; only qualification documentation differs. No board modification is required.

How is over-current protection implemented and verified on this board?

Valley-current detection triggers hiccup-mode shutdown during overload. Verified per page 11 test waveforms: SCP entry occurs at ~3.5A (1.6× rated), recovery begins after 10ms off-time, and PG deasserts during fault. R5 (20Ω) provides current-sense path visibility at TP5.