Monolithic Power Systems Inc. MP5017AGD-Z

Overview

MP5017AGD-Z 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–5.5V input, delivers up to 5A load current (adjustable via ILIMIT resistor), features 45mΩ R_DS(ON), and protects downstream circuits in hot-swap and USB power-distribution applications.

For engineers reviewing the MP5017AGD-Z datasheet, MP5017AGD-Z pinout, MP5017AGD-Z application, or MP5017AGD-Z equivalent, this page provides verified functional context, validated pin roles, confirmed protection thresholds (OVP = 5.8V, UVLO = 2.7V), thermal auto-retry behavior (175°C shutdown, 76ms recovery), and real-world current-limit configuration (e.g., 2.4A with 499Ω).

Technical Context

The MP5017AGD-Z integrates dual N-channel MOSFETs for bidirectional blocking and uses a precision 1.23V reference with fast comparator circuitry to achieve 10µs output OVP response. Its DV/DT pin controls soft-start slew rate via external capacitor, while ILIMIT sets current limit using a linear 1.16V reference and scalable resistor divider.

Under-voltage lockout (2.7V threshold with 250mV hysteresis) and thermal shutdown (175°C trip, 125°C release) are implemented with dedicated analog comparators and internal thermal sensing. Fault reporting combines open-drain FAULT with differentiated deglitch timers: 5ms for over-current, 10µs for output OVP, and no deglitch for OTP.

Key Specifications

Pinout & Package

MP5017AGD-Z is housed in a thermally enhanced QFN-12 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad (Pin 12). The package supports high-current routing and efficient heat dissipation in space-constrained applications such as M.2 SSD modules and mini-PCIe modems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCK323A and TPS25942L, MP5017AGD-Z uniquely balances 5.5V input optimization, 45mΩ conduction loss, full reverse-current blocking, and compact 2mm×3mm footprint - making it ideal for space-constrained 5V hot-swap nodes where bidirectional protection and precise current tuning are mandatory.

Availability

MP5017AGD-Z is available at Aetrix Electronics and suitable for HDD/SSD power sequencing, USB-C power distribution, and wireless modem data card designs requiring stable component supply, consistent parametric performance, and long-term lifecycle assurance.

Supply support for MP5017AGD-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 power management ICs, with over two decades of expertise in DC/DC converters, LED drivers, and protection devices.

The MP5017A belongs to MPS's eFuse and current-limit switch product line, engineered specifically for hot-swap, USB power delivery, and storage interface protection where fast OVP, reverse blocking, and programmable current limiting are critical.

FAQ

What is the maximum allowable input voltage transient for MP5017AGD-Z?

The absolute maximum VIN rating is +16V, verified per Absolute Maximum Ratings table. This withstands hot-swap transients and ESD-induced spikes without latch-up or degradation, provided layout follows MPS PCB guidelines (short wide traces, 4.7μF local decoupling).

How do I configure a 3.3A current limit using the ILIMIT pin?

Using Equation (2) from the datasheet: R_LIMIT = 1.16V × 10³ / I_LIMIT. For 3.3A, R = 351Ω - use standard 1% 357Ω resistor. Confirm with Figure 6 (Current Limit vs. RLIMIT), where 357Ω yields ~3.3A at V_OUT drop of 10%.

Does MP5017AGD-Z support automatic restart after over-temperature shutdown?

Yes. At junction temperature ≥175°C, it enters thermal shutdown and pulls FAULT low. After die cools to ≤125°C, a fixed 76ms internal timer expires before automatic re-enabling - no external reset required.

Can the SAS/OV pin be used simultaneously for enable control and input over-voltage protection?

No - SAS/OV is a dual-function pin but operates in mutually exclusive modes. When used as OVP control (via resistor divider), it must remain unconnected to digital logic. For simple enable/disable, tie directly to GND or VCC; do not share with voltage-divider networks.

What is the purpose of the exposed thermal pad (Pin 12) and how should it be connected?

Pin 12 is the GND-connected thermal pad, essential for heat dissipation. It must be soldered to a minimum 100mm² copper pour with ≥4 thermal vias (0.3mm diameter) to inner ground plane. Omitting this reduces θ_JA by >20°C/W and risks thermal shutdown under 3A load.

Is output discharge active when the device is disabled via EN pin?

Yes. Output discharge engages whenever EN = low or SAS/OV = high. The internal 130Ω discharge path between VOUT and GND activates automatically, draining C_OUT to <1V within 100ms for 100μF load - satisfying USB and PCIe hot-plug safety standards.

How does the FAULT pin differentiate between over-current and over-voltage events?

FAULT asserts low for both, but with distinct deglitch timers: 5ms for over-current (OCP), 10µs for output over-voltage (OVP). This allows host firmware to infer fault type by measuring pulse width - no additional status registers or I²C interface needed.