Diodes Incorporated AP22850SH8-7

Overview

AP22850SH8-7 from Diodes Incorporated is a programmable p-channel load switch in W-DFN2020-8 (Type C) package, designed for high-efficiency power distribution with adjustable soft-start (via SS pin capacitor) and controlled discharge (via DIS pin resistor). It delivers 8A load current capability with 21mΩ typical R_DS(ON), operates from 4.5V to 11V input, and features near-zero quiescent current (≤5nA at VIN=10V) - ideal for battery-powered ultrabooks and notebooks requiring precise power sequencing.

For engineers reviewing the AP22850SH8-7 datasheet, AP22850SH8-7 pinout, AP22850SH8-7 application, or AP22850SH8-7 equivalent, key selection criteria include its adjustable ramp-up/fall-time control, integrated open-drain Power-Good (PG) flag, absence of external gate pullup, and thermally optimized exposed-pad DFN package - all critical for low-power, high-reliability system-level power management.

Technical Context

The AP22850SH8-7 implements a p-channel MOSFET-based load switch with independent bias rail (VBIAS: 2.5–5.5V) enabling stable gate drive across wide VIN range (4.5–11V). Its soft-start circuitry uses an external capacitor between SS and VOUT to linearly control VOUT rise time (e.g., 100µs typ. with 10nF), while DIS pin drives an internal discharge FET (R_{DS_DIS} = 8–16Ω) to actively sink VOUT when EN is low.

Functional integration includes an open-drain PG output that asserts high-impedance state only after VOUT reaches ≥90% of VIN and remains stable - verified by t_PG = 205–250µs delay - and transient suppression circuitry that blocks fast VIN edges (with EN low) from coupling to VOUT, ensuring clean power domain isolation during sleep states.

Key Specifications

Pinout & Package

AP22850SH8-7 is housed in a thermally enhanced W-DFN2020-8 (Type C) package with 2.0mm × 2.0mm footprint and exposed thermal pad. The 0.5mm pitch, 8-terminal layout supports high-current routing and efficient PCB heat dissipation via bottom-side vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable load switch applications.

Compared with TPS22919DNYR and RT9711CGJ5, AP22850SH8-7 uniquely combines user-adjustable soft-start/discharge, integrated PG flag, and near-zero I_Q without external pullups - making it optimal for systems demanding precise power sequencing, fast dynamic power gating, and ultra-low standby consumption.

Availability

AP22850SH8-7 is available at Aetrix Electronics and suitable for ultrabook power sequencing, notebook subsystem isolation, and e-reader display backlight control requiring stable component supply despite its obsolete status - supported via legacy inventory and cross-reference assistance.

Supply support for AP22850SH8-7 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, specializing in high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP22850 belongs to Diodes' programmable load switch product line, engineered specifically for precision power-domain control in portable computing platforms - emphasizing ultra-low quiescent current, adjustable timing, and robust thermal performance in miniature DFN packages.

FAQ

What is the function of the VBIAS pin on AP22850SH8-7?

VBIAS supplies regulated power (2.5–5.5V) to the internal gate driver and control logic, decoupling them from VIN fluctuations. This ensures consistent R_DS(ON), accurate soft-start timing, and reliable PG assertion across the full 4.5–11V input range - critical when VIN varies significantly during battery discharge.

How does the DIS pin enable active output discharge?

When EN is low, the DIS pin activates an internal N-channel FET (R_{DS_DIS} = 8–16Ω) that connects VOUT directly to GND. An external resistor (RDIS ≥240Ω) sets the RC time constant with VOUT capacitance, controlling fall time from 70µs to >1ms - preventing floating outputs and eliminating need for external discharge components.

Why does AP22850SH8-7 not require an external gate pullup resistor?

The device integrates a charge-pump-based gate driver that self-generates the required gate-source voltage for the p-MOSFET without relying on external pullup current. This architecture eliminates the primary source of quiescent current in conventional p-channel switches, achieving ≤5nA I_Q - essential for multi-year battery life in always-on subsystems.

Can AP22850SH8-7 be used in automotive applications?

AP22850SH8-7 is not AEC-Q100 qualified and is marked obsolete for new designs. While its -40°C to +85°C operating range meets some automotive ambient requirements, Diodes explicitly states that automotive-grade variants require separate qualification (PPAP, IATF 16949 manufacturing) - so it must not be deployed in safety-critical or production automotive systems without formal requalification.