Monolithic Power Systems Inc. EV5021B-QV-00A

Overview

EV5021B-QV-00A from Monolithic Power Systems is a hot-swap protection device integrating a 7mΩ R_DS(ON) N-channel MOSFET, supporting 4.8–16V input, 10A current limit at VIN ≥8V, and ±5% accurate current monitoring. It provides fast short-circuit response (<200ns), programmable over/under-voltage lockout, and thermal shutdown with user-selectable auto-retry or latch-off mode - deployed in server backplane power distribution and industrial hot-swap modules.

For engineers reviewing the EV5021B-QV-00A datasheet, EV5021B-QV-00A pinout, EV5021B-QV-00A application, or EV5021B-QV-00A equivalent, this evaluation board enables rapid validation of hot-swap sequencing, current-limit tuning, PG/FLTB fault signaling, and IMON-based telemetry in 12V/5V intermediate bus systems.

Technical Context

The EV5021B-QV-00A is an evaluation platform for the MP5021BGQV IC, configured to demonstrate full hot-swap functionality including soft-start control via SS pin, external current limit setting (ISET), EN blanking time adjustment, and discharge path activation. It implements all protection features: over-current (OCP), over-temperature (OTP), damaged MOSFET detection, and UVLO/OVLO.

Board-level design includes dual-stage output filtering (470μF electrolytic + 22μF ceramic), 3.3V bias rail generation, PG and FLTB test points, and IMON signal routing to SMA connector - enabling real-time current monitoring with oscilloscope or ADC interface without additional signal conditioning.

Key Specifications

Availability

EV5021B-QV-00A is available at Aetrix Electronics and suitable for server backplane power management, industrial hot-swap module development, and telecom line card qualification requiring stable component supply and validated reference designs.

Supply support for EV5021B-QV-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, hot-swap, LED drivers, and motor control.

The MP5021B product line delivers integrated hot-swap controllers with ultra-low R_DS(ON), precision current sensing, and robust fault management - designed specifically for high-reliability 12V/48V intermediate bus applications in datacom and industrial infrastructure.

FAQ

What is the default current limit setting on the EV5021B-QV-00A board?

The board is configured with a default current limit of 6.3A, set by R8 (365kΩ) connected to the ISET pin per the MP5021BGQV's 100mV/V transconductance. This value is verified in the schematic and matches the "I_limit=6.3A" annotation on CN1. Users may adjust it using the formula I_LIM = 0.1V / R_ISET.

How do I configure the board for 5V output instead of 12V?

To operate at 5V output, remove resistor R9 (100kΩ) from the feedback network. The board's FB pin connects to a resistive divider (R4/R5 = 51kΩ each) that sets VOUT = 12V by default. Removing R9 reconfigures the divider to produce ~5V; no other component changes are required per the Quick Start Guide.

Does the EV5021B-QV-00A support external enable control?

Yes. The EN pin accepts TTL-compatible logic: applying ≥2V enables the device, while ≤0.4V disables it. The board includes a 3-pin header (CN1) labeled "EN", "ENTM", and "TIMER", allowing direct connection to microcontroller GPIO or sequencer signals without level-shifting.

What protection features are demonstrated on this evaluation board?

All MP5021BGQV protections are implemented: over-current (OCP), over-temperature (OTP), under/over-voltage lockout (UVLO/OVLO), damaged MOSFET detection, and PG/FLTB status reporting. The board routes FLTB and PG to test points and includes SMCJ12A TVS and B330A Schottky diodes for input/output transient suppression.

Is the IMON signal accessible for external measurement?

Yes. The IMON pin is routed to an SMA connector (labeled "IMON") on the board edge, providing a low-impedance, buffered analog voltage output proportional to load current (100mV/A). Its ±5% accuracy is maintained across temperature and line conditions as specified in the MP5021BGQV datasheet.

What package does the mounted IC use?

The board mounts the MP5021BGQV in a 22-pin QFN package measuring 3mm × 5mm, with exposed thermal pad. Pin numbering and layout match the official MPS QFN-22 footprint; the silkscreen labels VIN, OUT, GND, PG, FLTB, IMON, and EN for unambiguous probing and interconnection.