Diodes Incorporated AP22655WU-7

Overview

AP22655WU-7 from Diodes Incorporated is a single-channel, active-high enabled, precision adjustable current-limit high-side power switch in TSOT26 (Type A1) package. It delivers up to 3.1A continuous load current, supports 3.0V–5.5V input range, provides ±12% current-limit accuracy at 1.0A (with 6.8kΩ ILIM resistor), and integrates reverse-current blocking, overtemperature shutdown (+155°C), and 5µs short-circuit response for USB-compliant hot-swap protection.

For engineers reviewing the AP22655WU-7 datasheet, AP22655WU-7 pinout, AP22655WU-7 application, or AP22655WU-7 equivalent, key selection criteria include programmable current limit (0.4–3.56A), active-high enable logic, fault reporting with 7ms deglitch, soft-start rise time (1.0ms typ), and integrated reverse-voltage protection (65mV trip).

Technical Context

The AP22655WU-7 implements a high-side NMOS power switch with gate driver slew-rate control, internal current-sense FET (no external sense resistor), and deglitched open-drain FAULT output. Its UVLO (2.25V typ) and thermal shutdown (+155°C) operate independently of enable state.

Current limiting is set via external ILIM resistor (1.91kΩ–16.9kΩ), yielding ILIMIT = 6800/RLIM(kΩ) mA (typ); reverse-current protection activates when VOUT > VIN by ≥65mV, clamping reverse current to 0.32A (typ) with 2–20ms turn-off delay.

Key Specifications

Pinout & Package

TSOT26 (Type A1) package: 6-pin, 1.7mm × 2.9mm × 0.6mm body, exposed thermal pad connected to GND externally for enhanced thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable current-limit high-side switch applications.

Compared with AP22654WU-7, AP22655WU-7 offers direct GPIO compatibility without level-shifting; versus TCK112G, it provides design flexibility through resistor-programmed current limits and comprehensive reverse-path protection essential for USB OTG and docking.

Availability

AP22655WU-7 is available at Aetrix Electronics and suitable for USB hub power management, laptop docking station protection, and residential gateway charging ports requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP22655WU-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 power management, signal integrity, and protection solutions for consumer, computing, and industrial markets.

The AP22655 belongs to Diodes' Precision Adjustable Current-Limit Power Switch family, designed specifically for USB-compliant hot-swap applications demanding accurate current limiting, reverse-current blocking, and fast fault response in compact packages.

FAQ

What is the minimum ILIM resistor value supported, and what current limit does it yield?

The minimum recommended ILIM resistor is 1.91kΩ, yielding a typical current-limit threshold of 3.56A (ILIMIT = 6800 / 1.91 ≈ 3560 mA). This setting supports maximum continuous load current of 3.1A while maintaining headroom for tolerance and temperature drift. Using lower resistance risks exceeding absolute maximum ratings and invalidates guaranteed performance.

How does the FAULT pin behave during a short-circuit event?

During a short circuit, the FAULT pin asserts low after a 7ms deglitch period, remaining low until the fault condition clears and the device recovers. It reports overcurrent, overtemperature, reverse-voltage, and short-circuit faults simultaneously. The open-drain output requires an external pull-up resistor (typically 10kΩ) to the host controller's logic rail.

Can AP22655WU-7 be used in automotive applications?

No - AP22655WU-7 is rated for industrial temperature range (−40°C to +85°C ambient) and is not AEC-Q200 qualified. For automotive use, Diodes offers the pin-compatible AP22655Q variant, which undergoes extended temperature testing (−40°C to +125°C junction), automotive-grade qualification, and enhanced ESD robustness per AEC standards.

What is the role of the exposed thermal pad, and how should it be connected?

The exposed pad is internally connected to GND and serves as the primary thermal conduction path. It must be soldered to a dedicated PCB copper pour tied to system ground, covering ≥80% of pad area with ≥4 thermal vias (0.3mm diameter) to inner ground planes. Failure to connect it degrades R_θJA from 89°C/W to >150°C/W, risking thermal shutdown under 2A load.