Diodes Incorporated AP2191AFM-7

Overview

AP2191AFM-7 from Diodes Incorporated is a single-channel, active-high enable, current-limited high-side power switch optimized for USB 2.0 and hot-swap applications. It delivers 2.1A accurate current limiting, 95mΩ typical R_DS(ON) at +25°C, 0.6ms typical rise time, and integrated short-circuit/thermal protection with 7ms deglitch on the open-drain FLG output. It operates across 2.7V–5.5V input and supports consumer electronics power delivery in compact U-DFN2018-6 packaging.

For engineers reviewing the AP2191AFM-7 datasheet, AP2191AFM-7 pinout, AP2191AFM-7 application, or AP2191AFM-7 equivalent, key selection criteria include enable polarity (active-high), thermal shutdown threshold (+140°C), reverse current blocking capability, UVLO trip point (1.9V typ), and compatibility with 120μF output capacitance for low-temperature short-circuit immunity.

Technical Context

The AP2191AFM-7 implements a monolithic N-channel MOSFET high-side switch with internal current-sense FET architecture-eliminating external sense resistors while maintaining precise 2.1A over-current threshold. Its deglitched FLG output asserts low only after sustained fault conditions exceed 7ms, preventing false triggers during capacitive inrush.

It integrates undervoltage lockout (UVLO) that disables switching below ~1.9V and thermal shutdown with +25°C hysteresis, enabling autonomous cycling during persistent overload. The device supports dual-purpose ports (e.g., HDMI/MHL with battery charging) by ensuring controlled V_OUT ramp-up prior to EN assertion, avoiding bus contention or voltage droop.

Key Specifications

Pinout & Package

AP2191AFM-7 is housed in a 2.0mm × 1.8mm U-DFN2018-6 package with exposed thermal pad (to be connected to GND plane). The 6-pin layout supports high-density PCB placement and enhanced thermal performance (θ_JA = 70°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 AP2191AFM-7, AP2181AFM-7 offers identical protection and performance but requires active-low logic drive, while TCK112G sacrifices fault visibility and current capacity for lower cost and simpler interface - making AP2191AFM-7 optimal for USB-compliant, monitored hot-swap systems.

Availability

AP2191AFM-7 is available at Aetrix Electronics and suitable for USB host port protection, self-powered hub power switching, hot-plug module control, and dual-function HDMI/MHL port applications requiring stable component supply and full production traceability.

Supply support for AP2191AFM-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, industrial, and computing markets.

The AP21X1A product line delivers USB-compliant, current-limited high-side switches with integrated fault protection - designed specifically for robust hot-swap and portable device power control where size, thermal efficiency, and standards compliance are critical.

FAQ

What is the function of the FLG pin on AP2191AFM-7?

The FLG pin is an open-drain fault indicator that goes low when over-current or over-temperature conditions persist beyond the 7ms internal deglitch timeout. It remains low until both faults are cleared, enabling microcontroller polling or interrupt-driven fault handling without external filtering components.

Can AP2191AFM-7 be used in place of AP2181AFM-7?

AP2191AFM-7 and AP2181AFM-7 share identical electrical characteristics and pinout except for enable polarity: AP2191AFM-7 requires active-high EN, while AP2181AFM-7 requires active-low. Direct substitution is possible only if the host system's control signal matches the required polarity.

What is the maximum continuous load current supported by AP2191AFM-7?

The AP2191AFM-7 is rated for 1.5A maximum continuous load current per the manufacturer's recommended operating conditions. Although its current limit is 2.1A, sustained operation above 1.5A risks exceeding thermal limits in the U-DFN2018-6 package without adequate PCB copper area and airflow.

Does AP2191AFM-7 require external components for basic operation?

Yes - a 0.01–0.1µF ceramic capacitor between IN and GND is mandatory for stability. A 120μF electrolytic capacitor on OUT is recommended for low-temperature short-circuit immunity. FLG requires an external pull-up resistor; no RC network is needed for deglitching due to internal 7ms timer.