Diodes Incorporated AP2191WG-7

Overview

AP2191WG-7 from Diodes Incorporated is a single-channel, active-high enable, current-limited high-side power switch optimized for USB 2.0-compliant hot-swap applications. It delivers 1.5A continuous load current with 95mΩ typical R_DS(ON), 2.1A accurate current limiting, and integrated short-circuit/thermal protection. Used in USB ports of laptops, docking stations, and set-top boxes to manage inrush, block reverse current, and report faults via open-drain FLG.

For engineers reviewing the AP2191WG-7 datasheet, AP2191WG-7 pinout, AP2191WG-7 application, or AP2191WG-7 equivalent, key selection criteria include enable polarity (active-high), 2.7V–5.5V input range, 7ms FLG deglitch timing, thermal shutdown at +140°C, and SO-8 / U-DFN2018-6 package compatibility for space-constrained USB power delivery designs.

Technical Context

The AP2191WG-7 integrates a low-R_DS(ON) N-channel MOSFET with precision current-sense FET architecture-eliminating external sense resistors while maintaining ±10% current-limit accuracy across temperature. Its UVLO threshold is fixed at 1.9V (typ), and thermal shutdown activates at +140°C with +25°C hysteresis, enabling self-recovering fault behavior during sustained overload.

Control logic implements active-high EN with 2.0V VIH min and 0.8V VIL max, ensuring robust interfacing with 3.3V/5V microcontrollers. The open-drain FLG output asserts low after 7ms blanking time upon over-current or over-temperature events, and remains latched until both faults clear-no external pull-up or debouncing required.

Key Specifications

Pinout & Package

AP2191WG-7 is packaged in SO-8 (standard surface-mount) with exposed pad thermal enhancement. Pin functions are validated per Diodes DS31563 Rev. 8–2: GND (Pin 1), IN (Pins 2 & 3), EN (Pin 4), FLG (Pin 5), OUT (Pins 6 & 7), NC (Pin 8).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2036IRHBR and TPS2051BDBVR, AP2191WG-7 provides dedicated single-channel USB power switching with reverse blocking, tighter current limit accuracy (±10%), lower R_DS(ON), and simpler enable interface-reducing system-level validation effort for discrete port protection.

Availability

AP2191WG-7 is available at Aetrix Electronics and suitable for USB 2.0 port protection, laptop docking station power management, and set-top box peripheral hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.

Supply support for AP2191WG-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, headquartered in California, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.

The AP21xx family targets USB-compliant power distribution-designed specifically for hot-swap integrity, fault resilience, and minimal external component count in consumer and computing interfaces.

FAQ

What is the maximum continuous output current supported by AP2191WG-7?

The AP2191WG-7 supports 1.5A maximum continuous load current per its Recommended Operating Conditions. While its current-limit threshold is 2.1A (typ), sustained operation above 1.5A risks thermal shutdown due to power dissipation in standard SO-8 layout-designers must verify junction temperature using θ_JA = 110°C/W and actual board copper area.

Does AP2191WG-7 require external components for basic USB port protection?

No external components are required for core protection functions: current limiting, thermal shutdown, UVLO, and FLG reporting all operate autonomously. A 0.1µF ceramic bypass capacitor between IN and GND is recommended for stability, and a pull-up resistor on FLG is needed only if interfacing with a microcontroller interrupt pin.

Can AP2191WG-7 be used in USB-C applications?

AP2191WG-7 is specified for USB 2.0 (5V-only) applications and lacks native USB-C features such as CC logic, VCONN support, or 20V tolerance. It may serve as a secondary 5V VBUS switch in non-negotiated USB-C sink paths-but not as a primary port controller. USB-C PD compliance requires additional ICs.

How does the 7ms FLG deglitch time affect system response to short circuits?

The 7ms deglitch prevents FLG assertion during benign inrush events (e.g., plugging in a 100µF-capacitive USB device), allowing transient currents up to ~2.6A for <7ms without triggering host fault handling. True short circuits (>2.1A sustained beyond 7ms) will assert FLG reliably, giving firmware time to disable EN before thermal shutdown occurs.