Monolithic Power Systems Inc. MP5021GQV-Z

Overview

MP5021GQV-Z from Monolithic Power Systems is a 12V hot-swap protection IC with integrated 7mΩ R_DS(on) power FET, adjustable current limit (5–15A), ±5% current monitor accuracy, and fast 200ns short-circuit response. It protects backplane-connected peripherals-such as PC cards and disk drives-against inrush, overcurrent, overvoltage, undervoltage, and thermal faults during live insertion.

For engineers reviewing the MP5021GQV-Z datasheet, MP5021GQV-Z pinout, MP5021GQV-Z application, or MP5021GQV-Z equivalent, key selection criteria include programmable soft-start via SS pin, dual-mode fault recovery (auto-retry/latch-off), IMON-based current monitoring, and QFN22 (3×5mm) package compatibility with high-density PCB layouts.

Technical Context

The MP5021GQV-Z implements a sense-FET current-limit architecture with external R_SET resistor programming and internal charge-pump gate drive enabling ultra-low 7mΩ conduction loss. Its fault management uses a 200µA TIMER capacitor charging circuit to define timeout duration, while FLTB and PG open-drain outputs provide real-time status reporting with <10µs propagation delay.

It integrates an internal 5V sub-regulator powered from VIN, supports EN blanking via ENTM capacitor (up to 1.23s), and features damaged-MOSFET detection by monitoring V_OUT ≥ V_IN−1V at startup. The IMON output delivers voltage proportional to load current with user-set gain via R_MON.

Key Specifications

Pinout & Package

MP5021GQV-Z is housed in a thermally enhanced 22-pin QFN package (3mm × 5mm, exposed thermal pad), optimized for high-current hot-swap applications requiring low profile and efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hot-swap protection applications.

Compared with TPS23521RGET and LT4256IMS-1, MP5021GQV-Z uniquely balances ultra-low R_DS(on), programmable OCP, integrated IMON telemetry, and dual-mode fault recovery - making it optimal for space-constrained, intelligent hot-swap systems requiring both protection and visibility.

Availability

MP5021GQV-Z is available at Aetrix Electronics and suitable for PC card hot-swap, disk drive insertion, and industrial I/O module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP5021GQV-Z 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 design centers across Asia and North America and global manufacturing partnerships.

The MP5021 belongs to MPS's Hot-Swap & eFuse product line, engineered specifically for high-reliability, high-density hot-plug systems in computing, storage, and industrial infrastructure where precise current control and fast fault response are critical.

FAQ

What is the maximum continuous output current supported by MP5021GQV-Z?

The MP5021GQV-Z supports up to 10A continuous output current under recommended operating conditions (T_A = +25°C, θ_JA = 46°C/W). At higher ambient temperatures or with reduced airflow, derating applies per the thermal resistance curve; peak pulsed current capability reaches 25A for short-circuit protection.

How does the IMON pin generate its output voltage?

The IMON pin delivers a voltage proportional to load current using an internal current mirror referenced to the sense-FET. A resistor (R_MON) from IMON to GND sets gain: V_IMON = I_LOAD × R_MON × (100µA/A). Accuracy is ±5% over −40°C to +85°C, and a 100nF capacitor to GND suppresses switching noise.

Can MP5021GQV-Z operate with input voltages below 8V?

No - the MP5021GQV-Z has a specified input operating range of 8V to 16V. Below 8V, the UVLO circuit holds the device disabled; the rising UVLO threshold is 6.6V, but stable regulation and current limiting require ≥8V per datasheet characterization and thermal performance data.

What is the purpose of the PD pin, and how should it be used?

The PD (Pull-Down) pin connects internally to a 500Ω resistor that discharges the output capacitor when the device is disabled. To activate discharge, connect PD directly to the OUT node. Leaving PD floating disables the function. Adding a series resistor slows discharge rate, allowing fine-tuned control of output voltage decay time.

How is the soft-start time calculated for the SS pin?

Soft-start time τ_SS is calculated as τ_SS = R_SS × C_SS, where R_SS = 1MΩ (internal) and C_SS is the external capacitor value. For example, a 100nF capacitor yields τ_SS ≈ 20ms. Floating SS reduces ramp time to ~1ms minimum, as a 4µA internal current source charges the gate directly.

Does MP5021GQV-Z support bidirectional current flow?

No - MP5021GQV-Z is a unidirectional hot-swap controller designed for VIN → OUT power flow only. Its internal architecture, including the sense-FET topology and PG/FLTB logic, assumes forward conduction; reverse current (OUT → VIN) is blocked by the integrated power FET's body diode and not monitored or protected.

What is the role of the FB pin in MP5021GQV-Z operation?

The FB (Feedback) pin monitors output voltage via an external resistor divider to set the PG assertion threshold. With a 0.6V reference and 65mV hysteresis, FB determines when V_OUT is within specification (V_FB > 0.6V) for PG to go high - confirming valid output regulation before enabling downstream loads.