Monolithic Power Systems Inc. MP5094GJ-Z

Overview

MP5094GJ-Z from Monolithic Power Systems is a dual-channel, current-limited eFuse switch with integrated over-voltage clamping for 12V and 5V rails. It provides inrush current limiting via adjustable soft-start, fixed 4A/2.95A (Ch1) and 3A/2.18A (Ch2) trip/hold current limits, 50mΩ/30mΩ R_DS(ON), and fast 2µs OVP response-used in hot-swap power distribution for storage subsystems.

For engineers reviewing the MP5094GJ-Z datasheet, MP5094GJ-Z pinout, MP5094GJ-Z application, or MP5094GJ-Z equivalent, this page delivers verified electrical parameters, TSOT23-8 terminal mapping, thermal shutdown behavior, UVLO thresholds per channel, and real-world use cases in SSD/HDD power sequencing and backplane protection.

Technical Context

The MP5094GJ-Z implements two independent high-side current-limit switches with separate VCC, VOUT, SS, and enable control paths. Each channel features dedicated under-voltage lockout (9.7V/4.4V rising thresholds), output over-voltage clamp (15V/5.7V), and dual-stage current protection: primary hiccup-mode OCP (4A/3A trip) plus secondary 8A fast-turnoff SCP.

Soft-start is controlled by external capacitors on SS1/SS2 pins, generating linear voltage ramps that directly govern output slew rate; EN pin enables global digital on/off control with internal 280kΩ pull-down, supporting float-to-enable operation without external biasing.

Key Specifications

Pinout & Package

MP5094GJ-Z is housed in a thermally enhanced TSOT23-8 package (3mm × 3mm, 0.65mm pitch), optimized for high-current density PCB layouts with wide VCC/VOUT traces and direct thermal pad connection to ground planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-rail eFuse applications.

Compared with TPS25942L and RTQ2132B-QA, MP5094GJ-Z offers the smallest footprint (TSOT23-8), integrated 15V/5.7V OVP clamps eliminating external components, and optimized 12V/5V fixed current thresholds-making it ideal for cost-sensitive, space-constrained storage and industrial backplane designs where programmability is unnecessary.

Availability

MP5094GJ-Z is available at Aetrix Electronics and suitable for hard disk drive power sequencing, solid-state drive hot-swap protection, and industrial backplane power distribution requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP5094GJ-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, including DC/DC converters, LED drivers, and protection devices for consumer, industrial, and automotive markets.

The MP5094 belongs to MPS's eFuse and load switch product line, designed specifically for robust hot-swap and inrush current management in storage, computing, and modular power systems where reliability, small size, and integrated protection are critical.

FAQ

What is the maximum allowable input voltage transient for each channel?

MP5094GJ-Z supports 24V for 100ms on Channel 1 (12V rail) and 16V for 100ms on Channel 2 (5V rail), as specified in Absolute Maximum Ratings. These ratings reflect guaranteed surge tolerance without damage or latch-up, validated across temperature and process corners-not just brief test pulses.

Can the current limit thresholds be adjusted externally?

No-the MP5094GJ-Z uses factory-trimmed, fixed current limits: 4A trip / 2.95A hold for Channel 1 and 3A trip / 2.18A hold for Channel 2. There are no external pins or registers to modify these values; design margin must be verified against these exact thresholds.

How does the soft-start capacitor value affect startup behavior?

The SS1/SS2 capacitor sets the output voltage ramp time using t_SS ≈ (V_CLAMP × C_SS) / 5.5μA. For example, a 68nF capacitor yields ~10ms soft-start on both channels. Larger values increase ramp time, reducing inrush but extending power-up latency-critical for systems with tight sequencing windows.

Is the EN pin compatible with 3.3V logic control?

Yes-EN has a 250mV hysteresis and falling threshold of ~0.8V, making it fully compatible with standard 3.3V CMOS outputs. Driving EN high (>2V) disables both channels; floating or pulling low (<0.5V) enables them, leveraging the internal 280kΩ pull-down resistor.

Does MP5094GJ-Z require external current-sense resistors?

No-it integrates high-side MOSFETs with internal current sensing, eliminating external sense resistors. The device measures load current directly through R_DS(ON) voltage drop and proprietary analog circuitry, reducing BOM count and PCB area while maintaining ±15% current limit accuracy.

What thermal derating applies above 25°C ambient?

With θ_JA = 66°C/W on a 2-layer EV5094-J-00A board, power dissipation must be reduced linearly above 25°C. At 85°C ambient, max continuous power drops to ~1.2W (from 1.89W at 25°C), corresponding to ~3.5A at 12V (Ch1) or ~2.7A at 5V (Ch2) before thermal shutdown activates.

How does the dual-stage over-current protection operate?

Upon over-current, MP5094GJ-Z first enters constant-current (hold) mode at 2.95A (Ch1) or 2.18A (Ch2). If the condition persists >150µs, it triggers hiccup mode (200ms off, then retry). If current exceeds 8A, the secondary SCP circuit shuts down the MOSFET in <1µs-providing layered defense against both sustained overload and catastrophic shorts.