Diodes Incorporated AP2151DFMG-7

Overview

AP2151DFMG-7 from Diodes Incorporated is a single-channel, active-high enable, high-side USB power switch with integrated output discharge, 0.8A current limiting, 90mΩ R_DS(ON), and 7ms FLG deglitch. It operates from 2.7V–5.5V input, delivers controlled 0.6ms rise time, and provides reverse-current blocking and thermal shutdown at 140°C - deployed in USB hot-swap ports of laptops and docking stations.

For engineers reviewing the AP2151DFMG-7 datasheet, AP2151DFMG-7 pinout, AP2151DFMG-7 application, or AP2151DFMG-7 equivalent, this device supports precise current-limited power sequencing, fault-flag reporting with blanking, and low-quiescent shutdown (1µA max) in compact U-DFN2018-6 packaging for space-constrained USB Type-A/B port designs.

Technical Context

The AP2151DFMG-7 integrates a thermally protected N-channel MOSFET driver with slew-rate control, UVLO (1.9V threshold), and internal current-sense FET architecture - eliminating external sense resistors while maintaining accurate 0.8A overcurrent trip across -40°C to +85°C ambient. Its open-drain FLG output asserts low on overcurrent or thermal fault with 7ms deglitch timing, preventing false triggers during capacitive load turn-on transients.

Discharge functionality activates automatically upon EN deassertion via an internal 100Ω NMOS path, discharging output capacitance in <0.6ms (CL = 1µF). Reverse-current blocking prevents backflow when V_OUT > V_IN during disable, and the device sustains short-circuit current limiting without latch-off until thermal shutdown engages at ~140°C with 25°C hysteresis.

Key Specifications

Pinout & Package

AP2151DFMG-7 is housed in a 2.0mm × 1.8mm U-DFN2018-6 package with exposed thermal pad (internally connected to GND), optimized for low θ_JA = 70°C/W on 2"×2" PCB with thermal vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side USB power switch applications.

Compared with TUSB2036IPW and TPS22921YZPR, AP2151DFMG-7 uniquely combines discharge, 7ms FLG blanking, and reverse-current blocking in a single U-DFN2018-6 package - reducing design complexity for discrete USB port protection without sacrificing fault intelligence or layout area.

Availability

AP2151DFMG-7 is available at Aetrix Electronics and suitable for USB 2.0 port protection, laptop docking station power management, and set-top box peripheral interface applications requiring stable component supply and long-term industrial availability.

Supply support for AP2151DFMG-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for consumer, computing, and industrial markets.

The AP2151D family belongs to Diodes' USB Power Switch product line, engineered specifically for robust hot-swap operation in space-constrained USB host ports - emphasizing accurate current limiting, fast fault response, and seamless integration with legacy and next-gen peripheral ecosystems.

FAQ

What is the maximum continuous load current supported by AP2151DFMG-7?

The AP2151DFMG-7 supports a recommended maximum continuous load current of 0.5A per Diodes' datasheet (DS32242 Rev. 6-2), despite its 0.8A current-limit threshold. This derating accounts for thermal performance in the U-DFN2018-6 package at +85°C ambient, ensuring reliable operation without thermal shutdown under sustained loads.

Does AP2151DFMG-7 require external components for overcurrent fault reporting?

No. The AP2151DFMG-7 includes a hardware-deglitched open-drain FLG output with 7ms blanking time, eliminating the need for external RC filters or microcontroller firmware debouncing. The FLG pin asserts low only after sustained overcurrent or thermal fault conditions exceed the deglitch window.

How does the discharge function operate, and what is its design impact?

When EN is de-asserted, an internal 100Ω NMOS connects OUT to GND, discharging external output capacitance. For a 1µF load, discharge completes in ≤0.6ms (V_OUT < 0.5V), preventing floating voltages that could cause latch-up or ESD damage during hot-removal - critical for USB accessory interoperability.

Can AP2151DFMG-7 be used in dual-role USB ports (e.g., charging + data)?

No. Diodes explicitly advises against using AP2151D in dual-purpose ports like shared HDMI/MHL where simultaneous data streaming and battery charging occur. Its architecture lacks dynamic load switching or bidirectional current handling needed for such applications - use dedicated USB PD controllers instead.