Diodes Incorporated AP2172SG-13

Overview

AP2172SG-13 from Diodes Incorporated is a dual-channel, active-high enable, current-limited high-side power switch optimized for USB 2.0-compliant hot-swap applications. It delivers 1.5A typical current limiting, 115mΩ on-resistance (MSOP-8EP), 2.7V–5.5V input range, and integrated short-circuit/thermal protection with 7ms deglitched FLG reporting - deployed in LCD monitors and USB hubs to manage inrush and fault isolation.

For engineers reviewing the AP2172SG-13 datasheet, AP2172SG-13 pinout, AP2172SG-13 application, or AP2172SG-13 equivalent, this device supports dual independent load switching with precise over-current trip threshold (2.4A), controlled 0.6ms rise time, reverse current blocking, and UVLO at 1.9V - critical for stable USB port power management and hot-plug reliability.

Technical Context

The AP2172SG-13 integrates two independent N-channel MOSFET high-side switches with matched current-limit sensing, thermal shutdown at 140°C (25°C hysteresis), and under-voltage lockout that disables output below 1.9V. Each channel features dedicated EN and FLG pins, enabling per-port control and fault reporting without shared logic interference.

Its deglitch circuitry applies a fixed 7ms blanking window to both FLG outputs, suppressing transient over-current events caused by capacitive loads - eliminating need for external RC filters while maintaining fast response to sustained faults. The SO-8 package provides θ_JA = 110°C/W, supporting 1.0A continuous load under standard PCB layout conditions.

Key Specifications

Pinout & Package

AP2172SG-13 is supplied in SO-8 package (surface-mount, 150mil width) with exposed pad thermally connected to GND. Pin 1 is FLG1 (top-left corner, dot-marked); pin numbering follows standard SO-8 top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2162SG-13, the AP2172SG-13 simplifies interface design with active-high enables, while TUSB2036IRHBR adds protocol intelligence at the cost of flexibility and discrete fault visibility - making AP2172SG-13 optimal for custom USB power architectures requiring granular control and diagnostics.

Availability

AP2172SG-13 is available at Aetrix Electronics and suitable for USB 2.0 hub designs, LCD monitor peripheral power management, and set-top box front-panel port protection requiring stable component supply and long-term industrial availability.

Supply support for AP2172SG-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.

The AP2172 belongs to Diodes' USB Power Switch product line, engineered specifically for robust hot-swap operation in USB 2.0-compliant systems - emphasizing accurate current limiting, fast fault response, and minimal external component count.

FAQ

What is the maximum continuous load current supported by AP2172SG-13?

The AP2172SG-13 supports 1.0A maximum continuous load current per channel under recommended operating conditions (TA ≤ +85°C, SO-8 package, standard PCB layout). This derating accounts for thermal limits - the 1.5A current limit is a trip threshold, not a sustained rating. Exceeding 1.0A continuously risks thermal shutdown in typical ambient conditions.

Does AP2172SG-13 require external components for over-current protection?

No external components are required for basic over-current protection. The device integrates current-sense FETs, deglitch timing (7ms), and thermal shutdown. A pull-up resistor on each FLG pin is needed for proper logic-level reporting, and 0.1µF ceramic capacitors on IN and OUT are recommended for stability - but no current-sense resistors, timers, or external MOSFETs are necessary.

Can AP2172SG-13 be used with 3.3V logic control signals?

Yes. The EN1 and EN2 inputs are compatible with 3.3V logic: VIH is specified as ≥2.0V (min) across 2.7V–5.5V VIN range, and VIL is ≤0.8V. A 3.3V GPIO asserting high will reliably enable either channel; no level-shifter is required. Input leakage is ≤1µA, minimizing drive burden.

How does the FLG output behave during a short-circuit event?

Upon short-circuit detection, FLG goes active-low after a nominal 7ms deglitch period and remains low until both over-current and over-temperature conditions clear. If thermal shutdown activates, FLG stays asserted until junction temperature falls ~25°C below trip point (~115°C). FLG is open-drain and requires an external pull-up to function as a microcontroller interrupt or status indicator.