Diodes Incorporated AP2820CM-G1

Overview

AP2820CM-G1 from BCD Semiconductor Manufacturing Limited is a high-side power distribution switch with active-low enable and open-drain FLAG output, designed for USB-compliant hot-plug power management. It integrates an N-channel MOSFET with 60 mΩ R_DS(ON), over-current protection with fold-back, thermal shutdown, under-voltage lockout (2.5 V threshold), and soft-start-enabling safe 2.0 A continuous load switching in notebook and motherboard USB hub applications.

For engineers reviewing the AP2820CM-G1 datasheet, AP2820CM-G1 pinout, AP2820CM-G1 application, or AP2820CM-G1 equivalent, this device supports precise fault reporting via deglitched FLAG, low-quiescent current operation (80 μA typ.), and robust reverse-current blocking during shutdown-critical for USB bus power integrity and system-level fault isolation.

Technical Context

The AP2820CM-G1 implements a charge-pump–driven high-side N-MOSFET switch with integrated current-sense and thermal monitoring. Its active-low EN pin directly interfaces with USB host controllers, while the open-drain FLAG asserts low after 5–15 ms delay upon over-current or over-temperature events.

It features auto-discharge functionality (enabled in CM-G1 variant) to actively pull down VOUT after disable, eliminating residual voltage on downstream loads. UVLO ensures turn-on only above 2.5 V, and fold-back current limiting reduces power dissipation during sustained short-circuit conditions.

Key Specifications

Pinout & Package

AP2820CM-G1 is housed in an SOIC-8 package (4.9 mm × 6.0 mm, 1.27 mm pitch), RoHS-compliant and green (G1 suffix), rated for -40 °C to +85 °C ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDBVR and NIS5020MN, AP2820CM-G1 uniquely combines active-low EN, auto-discharge, open-drain FLAG, UVLO, and fold-back protection in a single SOIC-8 package-making it optimal for USB-compliant, self-contained hot-plug power management where fault visibility and safe discharge are mandatory.

Availability

AP2820CM-G1 is available at Aetrix Electronics and suitable for USB bus-powered hubs, notebook USB port switching, and hot-plug power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP2820CM-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 and power IC designer specializing in high-efficiency, high-reliability power management solutions for consumer, computing, and industrial markets.

The AP2820 product line targets USB-compliant power distribution with integrated protection-designed specifically for hot-plug reliability, low R_DS(ON), and seamless integration into host-controlled power architectures.

FAQ

What is the function of the FLAG pin on AP2820CM-G1?

The FLAG pin is an open-drain output that asserts low (≤70 mV at 5 mA sink) within 5–15 ms of over-current or over-temperature fault detection. It requires an external pull-up resistor and directly interfaces with USB host controller GPIOs to trigger fault-handling routines without additional logic.

Does AP2820CM-G1 support automatic discharge of the output capacitor?

Yes-AP2820CM-G1 includes internal auto-discharge circuitry (100–200 Ω pull-down on VOUT) activated upon EN deassertion. This discharges downstream capacitance to <0.5 V within 10 ms, satisfying USB resume timing requirements and preventing backfeed during hot-plug events.

How does the fold-back current limiting operate during a short-circuit condition?

When VOUT collapses near 0 V, the AP2820CM-G1 reduces current limit from 2.2 A to 1.18 A (fold-back). This cuts power dissipation in the MOSFET by ~50%, allowing sustained fault operation without immediate thermal shutdown-giving the host controller time to respond before junction temperature reaches 150 °C.

Can AP2820CM-G1 be used with 3.3 V logic-level enable signals?

Yes-the EN pin accepts logic-low thresholds ≤1.0 V and logic-high thresholds ≥1.6 V, making it fully compatible with 3.3 V CMOS outputs. Input current is ±1.0 μA, ensuring minimal loading on microcontroller GPIOs even at temperature extremes.