Diodes Incorporated AP2191SG-13

Overview

AP2191SG-13 from Diodes Incorporated is a single-channel, active-high enable, current-limited high-side power switch optimized for USB 2.0 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 AP2191SG-13 datasheet, AP2191SG-13 pinout, AP2191SG-13 application, or AP2191SG-13 equivalent, this page provides verified functional context, SO-8 package mapping, real-world timing behavior (0.6ms rise time), fault-blanking design rationale, and validated alternatives for USB power delivery systems requiring controlled turn-on and robust over-current response.

Technical Context

The AP2191SG-13 implements a monolithic N-channel MOSFET high-side switch with integrated current-sense FET architecture-eliminating external sense resistors while maintaining low conduction loss. Its UVLO threshold is fixed at 1.9V (typ), and thermal shutdown activates at +140°C with +25°C hysteresis, enabling self-recovering fault handling under sustained overload.

It features a 7ms deglitch timer on the open-drain FLG output to suppress false over-current reporting during capacitive load transients, and supports input voltages from 2.7V to 5.5V-fully compliant with USB 2.0 V_bus tolerance. The active-high EN pin simplifies direct interfacing with USB controller GPIOs without level-shifting.

Key Specifications

Pinout & Package

AP2191SG-13 is supplied in SO-8 package (lead-free, RoHS-compliant, "Green" molding compound). Exposed tab is thermally connected to GND for enhanced heat dissipation but must not serve as primary electrical ground path.

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, AP2191SG-13 offers dedicated high-side switching with zero-external-component fault reporting, tighter current limit accuracy (±5% vs ±15%), and lower R_DS(ON)-making it optimal for space-constrained, reliability-critical USB power gates where data PHY integration is unnecessary.

Availability

AP2191SG-13 is available at Aetrix Electronics and suitable for USB host port protection, laptop docking station power switching, and industrial USB hub applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AP2191SG-13 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.

AP2191SG-13 belongs to Diodes' AP21xx family of USB-compliant power switches-designed specifically for hot-swap and inrush-controlled power delivery in portable and embedded systems where compact size, low quiescent current, and fault resilience are critical.

FAQ

What is the function of the NC pin (Pin 8) on AP2191SG-13?

Pin 8 is internally unconnected and serves no electrical function. Diodes Incorporated recommends tying it to the OUT net for mechanical stability and improved EMI performance. Leaving it floating does not affect operation but may reduce board-level noise immunity in high-density layouts.

Can AP2191SG-13 be used with 3.3V-only systems?

Yes-its 2.7V–5.5V input range fully supports 3.3V operation. At VIN = 3.3V, R_DS(ON) rises to 120mΩ (typ), increasing conduction loss to ~270mW at 1.5A. Thermal design must account for this; SO-8 θ_JA = 110°C/W means ~30°C junction rise above ambient under full load.

How does the 7ms FLG deglitch work during hot-plug events?

The deglitch circuit monitors current-sense output continuously and only asserts FLG low if over-current persists beyond 7ms (typ). This ignores brief inrush spikes from charging 100µF output caps-verified in Diodes' Figure 6 test waveforms-eliminating need for external blanking components.

Is AP2191SG-13 compatible with USB Battery Charging (BC) 1.2 specification?

No-it is designed for USB 2.0 power delivery only and lacks BC1.2 detection logic (D+/D− handshake). It can supply power to BC1.2-compliant devices but cannot negotiate higher currents; maximum delivered current remains limited to 1.5A per USB 2.0 spec.