Diodes Incorporated AP2820CMTR-G1

Overview

AP2820CMTR-G1 from BCD Semiconductor is a high-side power distribution switch with active-low enable and open-drain fault flag, integrating an N-channel MOSFET (R_DS(ON) = 60 mΩ), charge pump, over-current protection with fold-back, thermal shutdown, and under-voltage lockout (UVLO = 2.5 V). It delivers 2.0 A continuous load current and supports USB-compliant hot-plug power management in notebook motherboard and USB hub applications.

For engineers reviewing the AP2820CMTR-G1 datasheet, AP2820CMTR-G1 pinout, AP2820CMTR-G1 application, or AP2820CMTR-G1 equivalent, this device offers verified USB voltage-drop compliance, deglitched FLAG signaling for OCP/OTP faults, soft-start–limited inrush current, and logic-level enable compatibility with 1.0 V low-threshold and 1.6 V high-threshold inputs.

Technical Context

The AP2820CMTR-G1 implements a charge-pump–driven high-side N-MOSFET architecture to maintain low R_DS(ON) across its 2.7–5.5 V input range. Its UVLO circuit ensures turn-on only above 2.5 V with 0.2 V hysteresis, while fold-back current limiting reduces short-circuit power dissipation during output-to-ground faults.

Thermal shutdown activates at 150 °C with 30 °C hysteresis, and the deglitched open-drain FLAG pin asserts low within 10 ms of over-current or over-temperature events. The device includes internal pull-low discharge resistance on VOUT during shutdown (for C/G versions) and blocks reverse current when disabled.

Key Specifications

Pinout & Package

AP2820CMTR-G1 is packaged in MSOP-8 (4.7 × 3.1 mm, 0.65 mm pitch), optimized for space-constrained USB power rails and motherboard VRM sections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDBVR, AP2820CMTR-G1 delivers tighter USB voltage-drop control and integrated fault handling; versus AP2820EMTR-G1, it trades 0.5 A capacity for lower thermal stress and reduced BOM cost in 2.0 A–constrained designs.

Availability

AP2820CMTR-G1 is available at Aetrix Electronics and suitable for USB bus hubs, notebook motherboards, hot-plug power supplies, and battery-charger circuits requiring stable component supply, RoHS-compliant green packaging, and long-term industrial lifecycle support.

Supply support for AP2820CMTR-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 power management solutions for computing, consumer, and industrial markets.

The AP2820 product line targets USB-compliant power distribution with integrated protection, designed specifically for space-constrained, thermally sensitive applications such as portable computing and peripheral interfaces.

FAQ

What is the function of the FLAG pin on AP2820CMTR-G1?

The FLAG pin is an open-drain output that pulls low (≤70 mV at 5 mA sink) to indicate over-current or over-temperature faults. It features built-in deglitching (5–15 ms delay) to reject transient noise, and requires an external pull-up resistor to the local USB controller's logic supply. This enables reliable fault reporting without software polling overhead.

Does AP2820CMTR-G1 support reverse current blocking?

Yes - when disabled (EN high), AP2820CMTR-G1 blocks reverse current from VOUT to VIN with leakage ≤1.0 μA even when VOUT exceeds VIN. This prevents backfeed into upstream sources such as batteries or shared 5 V rails, ensuring safe power domain isolation in multi-rail systems.

How does the soft-start feature limit inrush current?

The internal soft-start circuit ramps the gate drive over ~500 μs, limiting peak inrush current to <1.5 A with a 2.2 μF input capacitor. This prevents USB port over-current trips during hot-plug events and eliminates need for external inrush-limiting resistors or FETs in most implementations.

Is AP2820CMTR-G1 compatible with both 3.3 V and 1.8 V logic enable signals?

Yes - its active-low EN pin accepts logic-high up to 5.5 V and defines valid low at ≤1.0 V and valid high at ≥1.6 V. This ensures interoperability with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters, and guarantees clean turn-off even with noisy or slowly rising enable signals.