Diodes Incorporated AP2161DSG-13

Overview

AP2161DSG-13 from Diodes Incorporated is an active-low-enable, 1A high-side USB power switch with integrated output discharge, current limiting (1.5A typ), 90mΩ R_DS(ON) (U-DFN2018-6), and 7ms deglitched fault reporting. It operates from 2.7V–5.5V input, delivers controlled 0.6ms rise time, and supports hot-swap insertion in USB 2.0-compliant peripheral ports.

For engineers reviewing the AP2161DSG-13 datasheet, AP2161DSG-13 pinout, AP2161DSG-13 application, or AP2161DSG-13 equivalent, key selection criteria include enable polarity compatibility, thermal shutdown threshold (140°C), discharge resistance (100Ω), UVLO trip (1.9V typ), and package-specific R_DS(ON) and θ_JA values for thermal design.

Technical Context

The AP2161DSG-13 implements a high-side NMOS power switch with slew-rate-controlled gate driver, internal current-sense FET (no external shunt), and deglitched open-drain FLG output. Its UVLO activates only when EN is asserted and disables switching until VIN ≥1.9V.

Thermal protection uses die-temperature sensing with 140°C trip and 25°C hysteresis, causing pulsed output cycling until fault removal. Reverse-current blocking prevents backflow from OUT to IN when disabled, and the 100Ω internal discharge path actively pulls V_OUT to GND upon disable.

Key Specifications

Pinout & Package

AP2161DSG-13 is packaged in U-DFN2018-6: 2.0mm × 1.8mm, 0.5mm pitch, exposed thermal pad (to be connected to GND plane).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2036IPW and TPS2051BDBVR, AP2161DSG-13 uniquely combines active-low enable, integrated 100Ω discharge, and precise 7ms deglitching-enabling simpler, more robust USB port protection without auxiliary components or firmware overhead.

Availability

AP2161DSG-13 is available at Aetrix Electronics and suitable for USB 2.0 peripheral ports, hot-swap module interfaces, and consumer display hub power management requiring stable component supply and long-term industrial availability.

Supply support for AP2161DSG-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 industrial and consumer markets.

The AP2161D/AP2171D product line targets USB-compliant hot-swap power distribution, delivering integrated protection (current, thermal, UVLO, reverse current) and diagnostic features (FLG, discharge) in space-constrained packages.

FAQ

What is the function of the FLG pin, and how should it be interfaced?

The FLG pin is an open-drain output that asserts low during over-current or over-temperature faults. It includes a 7ms deglitch timer to ignore transient inrush events. Interface requires an external pull-up resistor (typically 10kΩ to 3.3V or 5V) to a microcontroller GPIO or interrupt input. The pin remains low until both fault conditions clear, enabling reliable host-side fault detection without software polling.

Does AP2161DSG-13 require external components for basic operation?

No external components are required for core switching functionality. However, Diodes recommends a 0.1µF X7R ceramic capacitor between IN and GND (placed near the device), plus a 10µF+ electrolytic capacitor on IN and OUT for heavy loads. These reduce voltage transients and improve stability but are not mandatory for minimal operation per datasheet test conditions.

How does the output discharge feature operate, and what load capacitance does it support?

When EN is de-asserted (high), the internal 100Ω NMOS discharge path connects OUT to GND. For a 1µF load, V_OUT falls below 0.5V in ≤0.6ms. The discharge time scales linearly with capacitance (t ≈ 0.6ms × C/1µF). It supports up to ~100µF reliably; larger caps may require extended time but remain within safe SOA limits per datasheet.

Can AP2161DSG-13 be used in dual-role USB ports (e.g., charging + data)?

No. Diodes explicitly advises against use in dual-purpose ports like HDMI/MHL where the same connector handles both data and battery charging. The active discharge function will drain connected peripheral batteries whenever the switch is disabled, creating an overstress condition. Use dedicated charge-management ICs instead for such applications.