Monolithic Power Systems Inc. MP5083GG-Z

Overview

MP5083GG-Z from Monolithic Power Systems is a 5.5V, 2A low-R_DSON load switch with integrated current monitoring, soft-start control, power-good indication, and fast short-circuit protection. It features a 50mΩ FET (at 5V_VCC), ±3% current monitor accuracy, <200ns fault response, and operates across 0.5V–5.5V input range in portable power rail management.

For engineers reviewing the MP5083GG-Z datasheet, MP5083GG-Z pinout, MP5083GG-Z application, or MP5083GG-Z equivalent, this device supports precision current-sense-enabled load switching in space-constrained, thermally sensitive systems requiring inrush control, output discharge, and real-time fault detection.

Technical Context

The MP5083GG-Z integrates a low-loss N-channel MOSFET with programmable current limiting via external R_IMON, enabling precise overcurrent protection at 1.3–1.5A typical threshold. Its internal 11µA soft-start current source charges an external capacitor to control V_OUT slew rate at 5× the SS-pin ramp rate.

It implements dual-stage short-circuit protection: primary current regulation (~2A) with ~20µs loop response, and secondary fast-off activation (~7A, <200ns) that forces 80µs forced shutdown. Thermal shutdown triggers at 150°C with 30°C hysteresis, and PG asserts after 50µs when |V_IN−V_OUT| falls below 280mV.

Key Specifications

Pinout & Package

MP5083GG-Z is housed in a thermally enhanced 2mm × 2mm QFN-12 package with exposed thermal pad (pins 6, 11, and exposed pad connect to VIN). The layout supports high-current routing and efficient heat dissipation in compact PCB footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar load switch applications.

Compared with TPS22919DCKR and RT9742GJ5, MP5083GG-Z uniquely combines ±3% current monitoring, push-pull PG, and <200ns fault response in a 2×2mm footprint-enabling compact, telemetry-rich power rail control where both precision sensing and deterministic sequencing are required.

Availability

MP5083GG-Z is available at Aetrix Electronics and suitable for notebook power sequencing, tablet peripheral switching, and portable SSD power management requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MP5083GG-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 mixed-signal ICs for power management, motor drive, and automotive applications.

The MP5083 belongs to MPS's load switch product line, engineered for space-constrained portable electronics requiring accurate current monitoring, fast fault response, and seamless integration into multi-rail power architectures.

FAQ

What is the minimum recommended soft-start capacitor value for MP5083GG-Z?

The datasheet specifies a minimum external soft-start capacitor of 4.7nF. Using smaller values risks uncontrolled V_OUT rise time due to insufficient SS-pin voltage ramping, potentially triggering current-limit behavior during startup. Larger capacitors extend soft-start duration linearly per the formula T_SS = (5 × C_SS) / 11µA, enabling precise inrush control for high-capacitance loads.

How does the IMON pin deliver current-proportional voltage?

The IMON pin outputs a voltage equal to I_LOAD × R_IMON × (1/S), where S is the internal current-sense ratio (~33,000 at 3.6V). With R_IMON = 23.8kΩ, a 2A load yields ~60.6µA output current, which develops a voltage across R_IMON. This architecture avoids sense-resistor power loss while maintaining ±3% accuracy across 0.6–2A.

Can MP5083GG-Z operate with V_CC and V_IN supplied from different sources?

Yes-V_CC (3–5.5V) powers the control circuitry independently of V_IN (0.5–5.5V). This allows V_CC to be derived from a stable auxiliary rail (e.g., always-on 3.3V LDO) while V_IN comes from a switched main battery rail, ensuring reliable enable/disable control even during V_IN brownouts or sequencing delays.

What happens during a short-circuit event, and how does recovery work?

Upon detecting ~7A peak current, the fast-off circuit disables the FET within <200ns and holds it off for 80µs. After this period, the device attempts re-enablement. If the short persists, it reduces the current limit and cycles until thermal shutdown at 150°C. Once the fault clears, the current limit automatically restores to its programmed value without external intervention.

Is the exposed thermal pad electrically connected, and how should it be routed?

Yes-the exposed pad (pins 6, 11, and center thermal pad) is internally connected to VIN. It must be soldered to a large copper pour tied to the VIN net, with ≥4 thermal vias to inner ground planes. This ensures both electrical continuity and optimal heat transfer, supporting the 1.6W maximum power dissipation rating in the QFN-12 package.

Does MP5083GG-Z support reverse current blocking?

No-the internal N-channel FET lacks body-diode reverse-blocking capability. When V_OUT > V_IN, current can flow backward through the intrinsic diode. For reverse-current protection, an external P-channel FET or dedicated reverse-blocking load switch must be used upstream of MP5083GG-Z.

How is the power-good (PG) signal asserted, and what timing dependencies exist?

PG asserts high when |V_IN − V_OUT| drops below 280mV, with a fixed 50µs delay from threshold crossing. It de-asserts low when the gap exceeds 340mV. PG remains valid only when EN is high and V_CC is within specification; it does not indicate overtemperature or current-limit conditions-only output voltage regulation status.