Diodes Incorporated AP2553FDC-7R

Overview

AP2553FDC-7R from Diodes Incorporated is a single-channel, active-high enable, precision adjustable current-limited high-side power switch in U-DFN2020-6 (Type C) package. It delivers up to 2.1A continuous load current, supports programmable current-limit threshold from 75mA to 2.36A (typ.) via external resistor, achieves ±6% accuracy at 1.632A (RLIM = 15kΩ), and features fast 2µs short-circuit response - optimized for USB-compliant hot-swap power delivery in LCD monitors and residential gateways.

For engineers reviewing the AP2553FDC-7R datasheet, AP2553FDC-7R pinout, AP2553FDC-7R application, or AP2553FDC-7R equivalent, this device serves as a robust, protection-integrated power switch for systems requiring precise over-current control, reverse-current blocking, thermal shutdown, and fault-flag reporting without external components.

Technical Context

The AP2553FDC-7R implements a high-side N-channel MOSFET driver with integrated slew-rate control, UVLO (2.4V–2.65V), and dual deglitch timers: 7ms on FAULT for over-current and 3.75ms for reverse-voltage events. Its current-limit circuit uses an internal sense FET - not a shunt resistor - enabling low R_DS(ON) (80–105mΩ typ. at +25°C) while maintaining ±6% accuracy at high thresholds.

It operates across 2.7V–5.5V input, supports soft-start (1.1–1.5ms typical rise time), provides reverse-current limiting during enable and blocking during shutdown, and asserts an open-drain FAULT signal upon over-current, over-temperature (>160°C), or reverse-voltage (>95mV). Latch-off behavior is absent - it maintains constant-current limiting per AP2553 specification.

Key Specifications

Pinout & Package

AP2553FDC-7R is housed in a 2.0mm × 2.0mm, 0.65mm pitch U-DFN2020-6 (Type C) package with exposed thermal pad. The package supports high-power density layouts and requires external GND connection to the pad for optimal thermal performance (θ_JA = 120°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2553W-7, AP2553FDC-7R offers 25% smaller footprint and 30% better thermal performance; versus AP22653FDC-7, it trades ±1% accuracy and 0.5µs speed for +0.6A current headroom - making it optimal for high-density, full-USB-power applications.

Availability

AP2553FDC-7R is available at Aetrix Electronics and suitable for USB power delivery hubs, LCD monitor power rails, and residential gateway interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP2553FDC-7R 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 industrial, computing, and consumer markets.

The AP2553 belongs to Diodes' Precision Adjustable Current-Limited Power Switch family, engineered specifically for USB-compliant hot-swap applications demanding accurate current limiting, fast fault response, and integrated reverse-current protection.

FAQ

What is the minimum recommended RLIM value for AP2553FDC-7R to achieve 2.1A current limit?

The datasheet specifies RLIM = 10kΩ yields a typical current-limit threshold of 2365mA. At -40°C to +85°C, the guaranteed minimum is 2200mA - meeting the 2.1A requirement. Using 10kΩ (1% tolerance) ensures full-range compliance without derating. Lower values risk exceeding absolute maximum ratings and are not supported.

Does AP2553FDC-7R support automatic recovery after over-current fault?

No. AP2553FDC-7R implements constant-current limiting - not latch-off - during over-current. It sustains regulated current until the overload clears or thermal shutdown activates. Recovery is immediate upon fault removal; no power cycle or EN toggle is required, distinguishing it from AP2553A-series latch-off variants.

Can the FAULT pin drive an LED directly without a current-limiting resistor?

No. FAULT is an open-drain output rated for 25mA sink current. Driving an LED directly risks exceeding VOL spec (≤180mV @ 1mA) and damaging the output stage. A series resistor (e.g., 4.7kΩ for ~1mA at 5V) is mandatory to limit current and ensure reliable flag assertion under all operating conditions.

Is the exposed thermal pad electrically connected internally?

No. The exposed pad on the U-DFN2020-6 (Type C) package has no internal electrical connection. It must be soldered to a PCB GND copper pour for thermal dissipation but must not serve as the primary ground conduction path - dedicated GND pins (Pin 5) carry return current.