Diodes Incorporated AP2181DMPG-13

Overview

AP2181DMPG-13 from Diodes Incorporated is an active-low enable, single-channel high-side USB power switch with integrated current limiting (2.1A typ), 90mΩ R_DS(ON) at 5V, and output discharge functionality. It operates from 2.7V–5.5V input, delivers up to 1.5A continuous load current, and features 7ms deglitched fault reporting-designed for USB 2.0 hot-swap protection in portable computing and consumer electronics.

For engineers reviewing the AP2181DMPG-13 datasheet, AP2181DMPG-13 pinout, AP2181DMPG-13 application, or AP2181DMPG-13 equivalent, key selection criteria include enable polarity (active-low), thermal shutdown threshold (140°C), output discharge resistance (100Ω), and package-specific thermal resistance (70°C/W for U-DFN2018-6).

Technical Context

The AP2181DMPG-13 implements a thermally protected, slew-rate-controlled high-side NMOS switch with internal current-sense FET and UVLO circuitry. Its gate driver incorporates rise-time control (0.6ms typ) and reverse-current blocking, eliminating external components for USB-compliant inrush management.

Functional blocks include deglitched open-drain FLG reporting (7ms blanking), discharge NMOS path (R_DIS = 100Ω), and thermal hysteresis (25°C) enabling self-recovery during sustained overload. All protections operate without external timing or sensing elements.

Key Specifications

Pinout & Package

AP2181DMPG-13 is packaged in U-DFN2018-6: 2.0mm × 1.8mm, 0.5mm pitch, exposed thermal pad (to be connected to GND). Pin 1 = FLG, Pin 2 = EN, Pin 3 = GND, Pin 4 = OUT, Pins 5–6 = IN (internally tied; must be externally shorted).

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, the AP2181DMPG-13 uniquely combines active-low enable, 7ms deglitched FLG, integrated 100Ω discharge, and USB 2.0–compliant thermal/UVLO behavior in a 2.0×1.8mm footprint-enabling compact, standards-compliant port protection without design compromises.

Availability

AP2181DMPG-13 is available at Aetrix Electronics and suitable for USB hub power management, laptop docking station port protection, smartphone charging circuit protection, and set-top box USB peripheral interface requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AP2181DMPG-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 AP2181DMPG-13 belongs to Diodes' AP21x1 family of USB power switches-engineered specifically for robust hot-swap operation in space-constrained, thermally demanding USB 2.0 endpoints and hubs.

FAQ

What is the maximum continuous load current supported by AP2181DMPG-13?

The AP2181DMPG-13 supports 1.5A maximum continuous load current under recommended operating conditions (T_A ≤ +85°C, proper PCB thermal layout). Its 2.1A current limit is a trip threshold-not a sustainable rating-and activates protective foldback during overload. Derating is required above +70°C ambient due to thermal resistance limitations in the U-DFN2018-6 package.

How does the 7ms FLG deglitch function interact with capacitive loads?

The 7ms deglitch on the FLG pin ignores transient overcurrent events shorter than 7ms, allowing safe inrush into large output capacitors (e.g., 120µF) without false fault assertion. This eliminates need for external RC filters. Once a fault persists beyond 7ms-such as sustained short-circuit-the FLG asserts low and remains latched until both overcurrent and overtemperature conditions clear.

Can AP2181DMPG-13 be used in dual-role USB ports (e.g., USB-C with power delivery)?

No. The AP2181DMPG-13 is not designed for dual-role ports where VBUS may be sourced from either end (e.g., USB-C DRP). Its architecture assumes fixed-direction power flow (IN → OUT) and lacks bidirectional control, VCONN support, or PD protocol awareness. It is validated only for standard USB 2.0 downstream-facing ports with host-supplied VBUS.

What is the role of the exposed thermal pad in the U-DFN2018-6 package?

The exposed pad on the AP2181DMPG-13's U-DFN2018-6 package must be soldered to a dedicated GND copper pour with ≥4 thermal vias to an internal ground plane. It serves solely as a thermal conduction path-not an electrical ground node-and reduces θ_JA from 170°C/W (SOT25) to 70°C/W, enabling 1.5A operation at +85°C ambient. Floating or misconnected pads cause thermal runaway.