Monolithic Power Systems Inc. MP5086GG-P

Overview

MP5086GG-P from Monolithic Power Systems is a 5.5V, 7A low-R_DS(ON) load switch with integrated current monitoring (±3% accuracy at 3.75A), NTC-based overtemperature protection (155°C thermal shutdown), and fast 200ns short-circuit response. It operates across 2.3V–5.5V input, features dual FETs (11mΩ main, 65Ω bypass), and targets power rail control in portable devices requiring precise current sensing and thermal safety.

For engineers reviewing the MP5086GG-P datasheet, MP5086GG-P pinout, MP5086GG-P application, or MP5086GG-P equivalent, this device supports critical design tasks including inrush current limiting, real-time load current monitoring via IMON output, NTC-based temperature threshold setting, and fail-safe OTP latching - all within a space-constrained 2mm×2mm QFN-12 package.

Technical Context

The MP5086GG-P implements a dual-FET architecture: a low-R_DS(ON) NMOS main switch (11mΩ @ 3.3V) for high-efficiency load delivery and a higher-R_DS(ON) PMOS bypass switch (65Ω) activated during EN-low mode. Its current monitor provides a voltage proportional to load current with programmable gain via external R_IMON, enabling accurate current limit setting (e.g., 7.7A for 7A full load).

Thermal protection combines two independent mechanisms: an NTC comparator that triggers when V_NTC falls below 20% of V_OUT, and a junction-sensing thermal shutdown at 155°C. Both force latch-off of main and bypass FETs, with OTP pin asserting open-drain high; recovery requires VIN or EN reset. Short-circuit protection uses a secondary 13A fast-turnoff circuit with 200ns response and auto-retry behavior.

Key Specifications

Pinout & Package

MP5086GG-P is housed in a thermally enhanced 2mm×2mm QFN-12 package with exposed thermal pad (pin 13 not electrically connected). The package supports high-density layout and efficient heat dissipation via PCB vias under the pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar load switch with current monitoring and thermal protection applications.

Compared with TPS22975 and NIS5020, MP5086GG-P uniquely integrates NTC-based remote temperature sensing, ±3% current monitoring, and sub-1µA transportation mode - making it the only option among the three capable of coordinated thermal-current-battery lifecycle management in portable designs.

Availability

MP5086GG-P is available at Aetrix Electronics and suitable for smartphone main power rails, tablet SSD power control, wireless module hot-swap interfaces, and industrial handheld battery management requiring stable component supply and guaranteed long-term availability.

Supply support for MP5086GG-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 analog and mixed-signal ICs for power management, motion control, and automotive applications.

The MP5086 belongs to MPS's load switch product line, engineered specifically for space-constrained portable electronics requiring integrated current sensing, thermal intelligence, and ultra-low-power standby modes.

FAQ

What is the maximum continuous load current supported by MP5086GG-P?

The MP5086GG-P supports up to 7A continuous load current at 5.5V input with proper PCB thermal design (≥4 thermal vias to inner ground plane). Derating applies above 85°C ambient; at 125°C junction temperature, max current drops to ~4.2A based on θ_JA = 80°C/W and P_D(MAX) = (150°C − T_A)/θ_JA.

How is the current limit threshold set, and what resistor value yields 7.7A?

The current limit is set using an external resistor R_IMON connected between IMON and GND. For 7.7A at VIN = 5V, use R_IMON = 10.5kΩ per Table 1 in the datasheet. The relationship follows ILimit = (1/R_limit) × S, where S ≈ 82,000 at 3.6V and scales with VIN.

Does MP5086GG-P support automatic recovery after thermal shutdown?

No - thermal shutdown and NTC protection both result in latched OTP assertion. Recovery requires either cycling VIN or pulling EN below 0.4V and holding OTP below 0.84V to enter transportation mode, then reapplying EN high or VIN to reset the latch.

Can the BP (bypass) pin drive more than 10mA in bypass mode?

No - the BP pin is rated for <10mA continuous current in bypass mode. Exceeding this risks excessive voltage drop across the internal 65Ω PFET and potential thermal violation. For higher standby loads, external circuitry must be added.

What is the recommended layout practice for the NTC pin to avoid noise-induced false trips?

Route the NTC trace away from noisy signals (switching nodes, clocks), use a local 10nF ceramic capacitor from NTC to GND near the IC, and place the external thermistor/resistor divider close to the pin. Avoid long traces or vias in the NTC path to minimize capacitive coupling and ESD susceptibility.

Is the IMON output ratiometric to V_OUT or absolute current measurement?

The IMON output is a voltage proportional to absolute load current (in µA per amp), not ratiometric to V_OUT. At 3.75A, IMON delivers 45.73µA (typical) into the external R_IMON, producing a voltage V_IMON = I_OUT × R_IMON × (sense ratio), enabling direct current readback independent of output voltage.

What happens to V_OUT during short-circuit detection?

Upon 200ns short-circuit detection, the main FET turns off completely within nanoseconds, collapsing V_OUT to near 0V. The device then waits 80µs before retrying at 2/3 the original current limit. If short persists, repeated retries occur until thermal shutdown at 155°C forces permanent latch-off.