Diodes Incorporated AP25810LDFZ20-13

Overview

AP25810LDFZ20-13 from Diodes Incorporated is a USB-C® downstream-facing port (DFP) controller with integrated 3A high-side power switch, CC-line monitoring, VCONN generation, and load-detection logic. It identifies UFP attachment, advertises 1.5A/3A sourcing capability via CC, applies VBUS/VCONN, detects audio/debug accessories, and supports S4/S5 low-power wake from AUX supply. Used in notebook sleep-charging ports and multi-port docking stations.

For engineers reviewing the AP25810LDFZ20-13 datasheet, AP25810LDFZ20-13 pinout, AP25810LDFZ20-13 application, or AP25810LDFZ20-13 equivalent, this device delivers verified USB-C Rev. 2.0 DFP control with 30mΩ R_DS(on), ±8kV IEC 61000-4-2 CC-line ESD, 1.95A load-detect threshold, and dual-supply VBUS/VCONN switching - critical for robust host-port design.

Technical Context

The AP25810LDFZ20-13 implements a hardware-based CC-line state machine to detect Rd termination, Ra signatures, and debug/audio accessory modes without firmware. Its dual-current-limit architecture uses external 100kΩ precision resistor (REF/REF_RTN) to set 1.7A or 3.4A ILIM with ±7.1% tolerance.

It integrates independent power paths: IN1→OUT (VBUS switch), IN2→CC1/CC2 (VCONN switch), and AUX-powered logic domain enabling wake-from-S5. Fault handling includes overcurrent deglitch (5.5–10.7ms), thermal shutdown at +155°C, and open-drain FAULT/LD_DET outputs with 350mV VOL.

Key Specifications

Pinout & Package

AP25810LDFZ20-13 is housed in a RoHS-compliant, thermally enhanced W-QFN3040-20 (Type A1) package with 20-pin top-side layout and exposed thermal pad (internally connected to GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB-C DFP controller applications.

Compared with TUSB544RGET and IP5306, AP25810LDFZ20-13 uniquely combines AUX-powered S4/S5 wake, hardware LD_DET for multi-port current sharing, and ±8kV CC-line ESD - making it the only option for robust, standards-compliant host-port designs requiring low-power operation and dynamic power management.

Availability

AP25810LDFZ20-13 is available at Aetrix Electronics and suitable for USB-C notebook sleep charging, multi-port docking stations, and USB-C wall chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP25810LDFZ20-13 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

AP25810LDFZ20-13 belongs to Diodes' USB-C interface product line, engineered specifically for host-side DFP control with integrated power switching, load detection, and low-power system wake - targeting portable computing and docking infrastructure.

FAQ

What is the purpose of the AUX supply pin?

The AUX pin supplies power to the AP25810LDFZ20-13's control logic independently of IN1 and IN2. When connected to a 2.9–5.5V always-alive rail (e.g., 3.3V standby), it enables the device to monitor CC lines and assert UFP/LD_DET outputs during system hibernate (S4) or OFF (S5) states - eliminating the need for main 5V rail activation.

How does the LD_DET output function in multi-port systems?

LD_DET asserts low when the connected UFP draws >1.95A (nominal). In multi-port docks, each AP25810LDFZ20-13 drives its LD_DET to a system MCU, which disables VBUS on other ports if total current would exceed shared supply limits - enabling hardware-assisted current budgeting without software polling or complex algorithms.

Can AP25810LDFZ20-13 support electronically marked cables?

Yes. When an electronically marked cable (Ra signature) is detected on CC1 or CC2, the device automatically applies VCONN power from IN2 to the appropriate CC pin. The VCONN switch has 450mA short-circuit limit and 365–600mΩ R_DS(on), meeting USB-C spec requirements for active cable power without external components.

What is the role of the REF and REF_RTN pins?

REF and REF_RTN form a precision current reference interface. A 100kΩ ±1% resistor between them sets the internal 0.8V reference, which directly determines the 1.7A or 3.4A current limit accuracy (±7.1%). This eliminates factory calibration and ensures consistent ILIM across temperature and unit-to-unit variation.