Diodes Incorporated AP2281-1FMG-7

Overview

AP2281-1FMG-7 from Diodes Incorporated is a single-channel, slew-rate-controlled high-side load switch based on a P-channel MOSFET, designed for power sequencing and inrush current limiting in portable electronics. It operates from 1.5V to 6V input, delivers ≤2A continuous load current, features 80mΩ typical R_DS(ON) at 5V, and provides 1ms controlled turn-on rise time. Used in smartphones and GPS navigators for rail isolation and hot-swap protection.

For engineers reviewing the AP2281-1FMG-7 datasheet, AP2281-1FMG-7 pinout, AP2281-1FMG-7 application, or AP2281-1FMG-7 equivalent, key selection criteria include input voltage range (1.5–6V), slew-controlled turn-on (1ms), ultra-low quiescent current (0.01µA), thermal pad-enabled U-DFN2018-6 package, and absence of integrated discharge FET.

Technical Context

The AP2281-1FMG-7 integrates an internal slew-rate control circuit that limits dV/dt at the output during turn-on to suppress inrush current and prevent supply rail droop. Its enable logic is active-high with VIH thresholds scaling with VIN (1.4V min at 1.5–2.7V, 1.6V at 2.7–5.25V).

Unlike the AP2281-3 variant, this part lacks an integrated discharge FET-output discharge relies on external circuitry or load leakage. Thermal management leverages the exposed thermal pad (Pin 7), requiring connection to a PCB ground plane per Diodes' recommended layout for θ_JA = 78°C/W.

Key Specifications

Pinout & Package

AP2281-1FMG-7 uses the U-DFN2018-6 package: 2.0mm × 1.8mm body, 0.5mm pitch, 0.13mm typical height, with exposed thermal pad (Pin 7) on bottom surface. Requires soldering thermal pad to PCB ground plane for rated power dissipation (1410mW).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2281-1WG-7, the AP2281-1FMG-7 offers 49% lower thermal resistance enabling full 2A operation at 85°C ambient; versus TCK107AG,TL, it delivers tighter slew control consistency and superior thermal handling but requires thermal pad layout discipline.

Availability

AP2281-1FMG-7 is available at Aetrix Electronics and suitable for smartphone power sequencing, GPS navigator hot-swap protection, and notebook USB port control requiring stable component supply across high-volume consumer electronics production.

Supply support for AP2281-1FMG-7 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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The AP2281 series belongs to Diodes' precision load switch product line, engineered specifically for inrush current suppression and rail isolation in space-constrained portable electronics with stringent battery-life requirements.

FAQ

What is the function of the thermal pad (Pin 7) on AP2281-1FMG-7?

The thermal pad is an exposed copper surface on the underside of the U-DFN2018-6 package, electrically connected to GND and thermally coupled to the silicon die. It must be soldered to a PCB ground plane using ≥3 thermal vias to achieve the specified θ_JA = 78°C/W and sustain 2A continuous current without thermal shutdown.

Does AP2281-1FMG-7 include an integrated discharge FET?

No. The AP2281-1FMG-7 does not integrate a discharge FET. Output discharge upon disable relies on external load leakage or optional external circuitry (e.g., pull-down resistor). Only the AP2281-3 variants include a 65–100Ω discharge FET between OUT and GND.

Can AP2281-1FMG-7 operate from a 1.5V input supply?

Yes. The device is fully specified down to 1.5V input, with R_DS(ON) rising to 210–280mΩ and VIH threshold dropping to 1.4V minimum. At 1.5V, it supports ≤1A continuous load while maintaining reliable enable logic and slew-controlled turn-on.

How does the enable threshold (VIH/VIL) scale with input voltage?

VIH is tiered: ≥1.4V for VIN = 1.5–2.7V, ≥1.6V for VIN = 2.7–5.25V, and ≥1.7V for VIN ≥ 5.25V. VIL remains fixed at ≤0.4V across all VIN. This adaptive threshold ensures robust noise immunity across mixed-voltage system interfaces without external level shifters.