Diodes Incorporated AP2805DM-G1

Overview

AP2805DM-G1 from BCD Semiconductor is a 500mA high-side power distribution switch with active-low enable and open-drain fault flag, designed for USB-compliant hot-plug power control. It features 60mΩ R_DS(ON) at 5V, 2.7–5.5V operating range, 0.7–1.4A current limiting, thermal shutdown at 150°C, and UVLO at 2.5V typical-enabling robust overcurrent, short-circuit, and temperature protection in portable USB hubs and notebook power rails.

For engineers reviewing the AP2805DM-G1 datasheet, AP2805DM-G1 pinout, AP2805DM-G1 application, or AP2805DM-G1 equivalent, this device supports precise load switching with deglitched fault reporting, soft-start inrush control, and reverse-current blocking-critical for USB bus-powered systems requiring reliable fault detection and low quiescent current (60µA typ) under active operation.

Technical Context

The AP2805DM-G1 integrates an N-channel MOSFET with charge-pump gate drive to achieve low on-resistance without external components. Its active-low enable logic (VENL ≤1.0V) directly interfaces with standard USB controller GPIOs, while the open-drain FLAG output pulls low during overcurrent or overtemperature events with 5–15ms delay for noise immunity.

Protection architecture includes fold-back current limiting during output short, thermal shutdown with 30°C hysteresis, and under-voltage lockout that disables the switch until VIN exceeds 2.5V. The device guarantees 0.5A continuous load capability and blocks reverse current when disabled-ensuring safe power sequencing in battery-charger and motherboard PC applications.

Key Specifications

Pinout & Package

AP2805DM-G1 is supplied in SOIC-8 package (5.0 × 6.2 mm, 1.27 mm pitch), RoHS-compliant and green-marked per "G1" suffix. Pin functions are validated per datasheet Figure 2 and ordering table: DM variant denotes active-low enable without auto-discharge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDR and AP2802DM-G1, the AP2805DM-G1 uniquely delivers 500mA capability with integrated fault-flag reporting and lower on-resistance-making it optimal for USB-compliant systems where diagnostic visibility and voltage-drop margin are critical.

Availability

AP2805DM-G1 is available at Aetrix Electronics and suitable for USB power management, notebook motherboard rails, and hot-plug peripheral supplies requiring stable component supply, RoHS/Green compliance, and long-term industrial availability.

Supply support for AP2805DM-G1 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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog IC design and wafer fabrication company specializing in high-reliability power management and interface solutions for consumer, computing, and industrial markets.

The AP2805 series belongs to BCD's high-side load switch product line, engineered specifically for USB-compliant hot-plug power distribution with integrated protection-targeting notebook, docking station, and peripheral hub applications demanding compact, certified, and fault-aware power control.

FAQ

What is the function of the FLAG pin on AP2805DM-G1?

The FLAG pin is an open-drain output that pulls low during overcurrent, overtemperature, or undervoltage fault conditions. It requires an external pull-up resistor and provides deglitched fault indication with 5–15ms delay-enabling reliable communication with USB host controllers without false triggering from transients.

Does AP2805DM-G1 support reverse current blocking?

Yes-when disabled, the AP2805DM-G1 blocks reverse current flow from VOUT to VIN, with leakage specified at 0.1–1.0µA. This feature prevents backfeeding into upstream power sources, which is essential for safe operation in multi-rail USB hubs and battery-backed systems.

How does the soft-start function operate in AP2805DM-G1?

Soft-start limits inrush current by controlling the MOSFET gate ramp rate during turn-on, resulting in a typical 500µs output rise time. This prevents voltage droop on shared 5V rails and avoids false overcurrent trips during hot-plug events-critical for stable USB enumeration.

Is AP2805DM-G1 pin-compatible with other variants in the AP2805 family?

Yes-AP2805DM-G1 shares identical SOIC-8 pinout and terminal assignments with all AP2805 variants (A/B/C/D). Differences are limited to enable polarity (active-low for D), auto-discharge presence (absent in DM), and marking-allowing drop-in replacement within the same package type without PCB changes.