Diodes Incorporated AP2820FMM-G1

Overview

AP2820FMM-G1 from BCD Semiconductor Manufacturing Limited is a high-side power distribution switch with active-low enable and open-drain fault flag, designed for USB-compliant hot-plug power management. It integrates an N-channel MOSFET with 60 mΩ R_DS(ON), supports 2.5 A continuous load, operates from 2.7 V to 5.5 V, and includes over-current protection, thermal shutdown, soft-start, and UVLO - deployed in notebook motherboard USB hub power rails.

For engineers reviewing the AP2820FMM-G1 datasheet, AP2820FMM-G1 pinout, AP2820FMM-G1 application, or AP2820FMM-G1 equivalent, key selection criteria include its 2.5 A current rating (E/F/G/H version), MSOP-8 package footprint, active-low enable logic, auto-discharge capability, and deglitched FLAG output for USB controller fault reporting.

Technical Context

The AP2820FMM-G1 implements a charge-pump–driven high-side N-MOSFET switch with fold-back current limiting and thermal foldback behavior during sustained overload. Its UVLO threshold is 2.5 V (±0.2 V) with 0.2 V hysteresis, ensuring reliable turn-on only above valid supply voltage.

It features a deglitched open-drain FLAG pin that asserts low within 5–15 ms of over-current or over-temperature events, and includes internal output pull-low resistors (100–200 Ω) for controlled discharge after shutdown - critical for USB bus compliance and safe hot-plug sequencing.

Key Specifications

Pinout & Package

AP2820FMM-G1 is housed in an MSOP-8 package (4.7 mm × 3.1 mm, 0.65 mm pitch), optimized for space-constrained USB port power routing on notebook and embedded motherboard PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDBVR, AP2820FMM-G1 delivers 25% higher current capacity, 30% lower conduction loss, and integrated auto-discharge - reducing component count and improving USB compliance. Against AP2820EMM-G1, it offers identical performance with inverted enable logic for flexible control architecture integration.

Availability

AP2820FMM-G1 is available at Aetrix Electronics and suitable for USB bus-powered hubs, notebook motherboard power management, and hot-plug power supplies requiring stable component supply, RoHS-compliant green packaging, and long-term industrial lifecycle support.

Supply support for AP2820FMM-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 fabless analog IC designer specializing in power management, USB interface, and high-reliability mixed-signal solutions for computing and consumer electronics.

The AP2820 product line targets USB-compliant power distribution with integrated protection, emphasizing low R_DS(ON), small footprint, and safety certification - specifically engineered for space- and thermal-constrained portable and embedded platforms.

FAQ

What is the maximum continuous output current supported by AP2820FMM-G1?

The AP2820FMM-G1 guarantees 2.5 A continuous output current, as confirmed in Section 4 (Ordering Information) and Table 8 (Electrical Characteristics for E/F/G/H versions) of the July 2012 Rev 1.7 datasheet. This rating applies across the full operating ambient temperature range (−40 °C to +85 °C) with appropriate PCB copper area and airflow.

Does AP2820FMM-G1 require an external pull-up resistor on the FLAG pin?

Yes - the FLAG pin is open-drain and requires an external pull-up resistor (typically 4.7 kΩ to 10 kΩ) to the local 3.3 V or 5 V rail. This is explicitly stated in the Pin Descriptions section (Page 2) and Figure 28 (Typical Application), where a 10 kΩ pull-up is shown connecting FLAG to VCC.

How does the auto-discharge feature operate in AP2820FMM-G1?

When the EN pin is de-asserted (driven high for this active-low part), the internal 100–200 Ω pull-down resistor connects VOUT to GND, discharging output capacitance rapidly. This behavior is confirmed for AP2820F/G versions in Table 7 (R_DISCHARGE) and distinguishes FMM-G1 from non-auto-discharge variants like AP2820BMM-G1.

Is AP2820FMM-G1 compatible with USB 2.0 voltage drop specifications?

Yes - its 60 mΩ typical R_DS(ON) at 2.5 A yields ≤150 mV total drop (I×R = 2.5 A × 0.06 Ω), well within the USB 2.0 specification limit of 330 mV for downstream ports. This is explicitly cited in the General Description (Page 1) as "designed to meet USB voltage drop requirements."