Monolithic Power Systems Inc. MP62550DGT-LF-P

Overview

MP62550DGT-LF-P from Monolithic Power Systems is a precision single-channel programmable current-limited power distribution switch with active-low enable, delivering up to 1.5A continuous output current, ±10% current-limit accuracy over 60mA–1.7A (typ), and integrated 88mΩ N-channel MOSFET in a 2×2mm TQFN-6 package. It operates from 2.5V to 5.5V input and is used for USB power distribution and hot-swap protection in portable electronics.

For engineers reviewing the MP62550DGT-LF-P datasheet, MP62550DGT-LF-P pinout, MP62550DGT-LF-P application, or MP62550DGT-LF-P equivalent, key selection criteria include adjustable current limit via ILIM resistor, fast 2μs over-current response, reverse-voltage protection at 135mV, thermal shutdown at 155°C, and FLAG open-drain fault reporting with deglitch timing.

Technical Context

The MP62550DGT-LF-P integrates an internal charge pump enabling gate drive above VIN down to 2.5V, allowing full enhancement of its N-channel MOSFET across the entire 2.5–5.5V supply range. Its current-limit circuit uses a precision external resistor (12.4kΩ–210kΩ) connected between ILIM and GND to set threshold with ±10% tolerance.

Over-current protection triggers constant-current mode within 2μs (typ), followed by thermal shutdown at 155°C (min) or 135°C (min) under sustained overload; recovery occurs automatically after ~10°C temperature drop. The FLAG pin provides open-drain fault signaling with 3.5–10ms deglitch for over-current but no deglitch for over-temperature events.

Key Specifications

Pinout & Package

MP62550DGT-LF-P is housed in a thermally enhanced 6-pin TQFN package (2mm × 2mm, 0.70–0.90mm height) with exposed thermal pad tied to GND for efficient heat dissipation. Pin mapping is validated per MPS Rev. 1.4 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable current-limited power distribution switch applications.

Compared with TPS2557DRBR and NCP45520MUTBG, MP62550DGT-LF-P uniquely combines programmable current limit, reverse-voltage protection, and thermal auto-retry in a 2×2mm footprint-enabling compact, robust power partitioning without external components.

Availability

MP62550DGT-LF-P is available at Aetrix Electronics and suitable for USB power distribution, PC card hot swap, and smartphone peripheral protection requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP62550DGT-LF-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 power ICs, with core expertise in DC/DC conversion, LED drivers, and power distribution solutions.

The MP62550 series belongs to MPS's precision load switch product line, designed specifically for space-constrained, battery-sensitive applications requiring accurate current limiting, robust fault handling, and minimal external components.

FAQ

What is the minimum recommended R_ILIM value for MP62550DGT-LF-P?

The datasheet specifies a minimum R_ILIM of 12.4kΩ for guaranteed 1.7A (typ) current limit and ±10% accuracy. Using lower resistance risks exceeding maximum current capability and degrading accuracy due to internal amplifier saturation. A 12.4kΩ 1% resistor yields 1.749A typical limit per Table 1.

Does MP62550DGT-LF-P support reverse-current blocking when input is 0V?

Yes. With VIN = 0V and VOUT = 5.5V, reverse leakage is specified at 0.01–1μA regardless of EN state. The internal reverse-voltage comparator disables the MOSFET when VOUT exceeds VIN by ≥135mV, ensuring no significant reverse current flows into the input rail.

How does the FLAG pin behave during UVLO activation?

The FLAG pin remains unchanged during input UVLO transitions. It only asserts low for over-current or over-temperature faults. This isolation prevents false fault reporting when VIN drops below 2.25V (UVLO threshold), ensuring system-level fault diagnostics remain unambiguous.

Can MP62550DGT-LF-P be used with a 2.5V input supply?

Yes. The device operates fully across 2.5V–5.5V input range. Its internal charge pump generates sufficient gate drive voltage even at 2.5V VIN, maintaining 88mΩ R_DS(on) performance and enabling reliable 1.5A continuous operation at minimum supply.

What is the thermal resistance θ_JA for the TQFN-6 package?

θ_JA is 80°C/W for the TQFN-6 (2×2mm) package when mounted on a standard 4-layer JEDEC test board (JESD51-7). This value assumes proper connection of the exposed thermal pad to a solid GND plane; inadequate thermal land pattern increases effective θ_JA and reduces safe operating current.

Is there a difference in R_DS(on) between MP62550DGT-LF-P and MP62550DJ?

Yes. MP62550DGT-LF-P (TQFN-6) has 88mΩ typical R_DS(on), while MP62550DJ (TSOT23-6) is specified at 100mΩ typical. The larger thermal pad and lower θ_JA of the TQFN package enable better current handling and reduced conduction loss.

How does auto-retry work without external circuitry?

Auto-retry is not enabled by default-it requires external RC network on EN and FLAG pins per Figure 6. When FLAG pulls EN low during fault, CRETRY charges; once EN rises above VI_HEN (1.1V), the device re-enables. No internal auto-retry logic exists-the feature is implemented externally.