Monolithic Power Systems Inc. MP5017AGD-P

Overview

MP5017AGD-P from Monolithic Power Systems is a configurable current-limit switch with integrated reverse-current blocking, fast 5.8V output over-voltage clamp, and programmable soft-start. It operates from 3V to 5.5V input, delivers up to 5A current limit (set via external resistor), features 45mΩ R_DS(ON), and resides in a thermally enhanced QFN-12 (2mm×3mm) package. It protects USB power distribution, hot-swap cards, and SSD/HDD power rails against inrush, short-circuit, over-temperature, and reverse conduction.

For engineers reviewing the MP5017AGD-P datasheet, MP5017AGD-P pinout, MP5017AGD-P application, or MP5017AGD-P equivalent, key selection criteria include adjustable current-limit threshold (1A–5A), 10µs OVP response time, reverse-blocking capability down to –200mA, fault reporting via open-drain FAULT pin, and thermal auto-retry behavior with 76ms recovery delay.

Technical Context

The MP5017AGD-P integrates dual N-channel MOSFETs for bidirectional blocking and uses internal current-sense amplification to regulate gate voltage during over-current events. Its DV/DT pin controls slew rate via an external capacitor, enabling precise soft-start timing (e.g., 7.2ms with 47nF).

It implements three independent protection loops: output OVP clamps VOUT at 5.8V with 10µs response; reverse-current detection triggers shutdown at –50mA (80µs deglitch) or –1A (immediate); and thermal shutdown activates at 175°C with 50°C hysteresis and auto-retry after 76ms cooling.

Key Specifications

Pinout & Package

MP5017AGD-P is housed in a thermally optimized QFN-12 (2mm × 3mm) package with exposed thermal pad (Pin 12). The package supports high-current routing and efficient PCB heat dissipation via direct pad soldering to internal ground planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limit switch applications.

Compared with TCKE801G and TPS25940ARVCR, MP5017AGD-P uniquely balances compact QFN-12 size, 5.8V fast OVP, and true reverse-current blocking - making it optimal for space-constrained 5V storage and communication modules where bidirectional fault containment is mandatory.

Availability

MP5017AGD-P is available at Aetrix Electronics and suitable for HDD/SSD power management, USB-C power distribution, and hot-swap PC card applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP5017AGD-P 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 MP5017A product line targets compact, high-reliability power protection in storage, computing, and communications equipment - delivering integrated eFuse functionality with minimal external components and industry-leading thermal performance in sub-3mm² packages.

FAQ

What is the minimum external resistor value for 5A current limit?

The MP5017AGD-P achieves ~5A current limit with a 226Ω resistor from ILIMIT to GND, per Equation (2): I_LIMIT = 1.16V × 10³ / R_LIMIT. At this setting, typical current limit is 5.04A with ±15% tolerance due to internal reference and sense amplifier variation. Layout parasitics and temperature drift may shift actual trip point by ±0.2A.

How does the FAULT pin behave during thermal shutdown?

During thermal shutdown, the FAULT pin pulls low immediately with no deglitch delay - unlike OCP (5ms) or OVP (10µs) events. This direct assertion enables rapid host MCU response. Recovery occurs only after die temperature falls below 125°C and the internal 76ms timer expires, ensuring stable restart without oscillation.

Can MP5017AGD-P support DEVSLP mode in SATA or NVMe SSDs?

Yes - the SAS/OV pin supports DEVSLP by pulling high to disable the device and activate output discharge. When SAS/OV is high, VOUT discharges through an internal 130Ω resistor, bringing SSD VCC to near-zero in <10ms (with 100μF output cap). This satisfies SATA Link Power Management (LPM) DevSlp entry timing requirements.

What is the maximum allowable output capacitance for stable soft-start?

The MP5017AGD-P supports up to 2200μF output capacitance during soft-start, as verified in typical waveforms (page 7). With C_OUT = 2200μF and CDV/DT = 47nF, VOUT ramps linearly at ~0.7V/ms. Larger values risk exceeding the 10% VOUT droop specification during current-limit regulation and may require increased ILIMIT resistor to maintain trip margin.

Does reverse current blocking remain active when EN is low?

Yes - reverse current blocking remains fully functional when EN is low, provided SAS/OV is not pulled high. The internal N-MOSFET pair stays biased to block conduction from VOUT to VCC. Only when both EN = low AND SAS/OV = high does the device enter full shutdown with discharge enabled and all blocking disabled.

Is the exposed thermal pad electrically connected to GND?

Yes - Pin 12 (exposed pad) is internally connected to GND and must be soldered to a dedicated PCB ground plane. Thermal resistance drops from θ_JA = 70°C/W (2-layer JEDEC board) to 40°C/W (EV5017A-D-00A evaluation board) when properly connected, enabling reliable 3A continuous operation at +70°C ambient.

What happens during a hard short at VOUT with 5A current limit set?

At hard short, the MP5017AGD-P first regulates at 5A for ~10µs, then triggers secondary current limit at 7.5A. The gate is rapidly discharged via 100mA pull-down, turning off the MOSFET within 100ns. After ~1ms off-time, it auto-retries - cycling until fault clears or thermal shutdown activates at 175°C.