Diodes Incorporated AP22800HB-7

Overview

AP22800HB-7 from Diodes Incorporated is a single-channel N-channel programmable load switch with adjustable soft-start and discharge control, 16 mΩ typical R_DS(ON), 4 A continuous current capability, and open-drain Power Good (PG) output - used for power sequencing and rail isolation in ultrabooks, SSDs, and consumer electronics.

For engineers reviewing the AP22800HB-7 datasheet, AP22800HB-7 pinout, AP22800HB-7 application, or AP22800HB-7 equivalent, key selection criteria include input voltage range (1.5–5.5 V), quiescent current (21 µA at 5 V), thermal performance in U-DFN2116-8, and configurable turn-on/turn-off timing via external RC components.

Technical Context

The AP22800HB-7 integrates an N-channel MOSFET with internal charge pump to drive the gate above VIN (up to ~1.6×VIN), enabling low R_DS(ON) operation across its 1.5–5.5 V input range. Its EN pin accepts GPIO-compatible logic (VIH = 1.0 V min, VIL = 0.5 V max) and controls both pass-switch activation and PG assertion.

Soft-start timing is set by an external capacitor on SS (e.g., 10 nF yields ~145 µs rise time at 5 V), while discharge rate is controlled by an external resistor between DIS and VOUT (e.g., 240 Ω yields ~55 µs fall time). PG asserts high only after gate overdrive is achieved, providing reliable power-status feedback.

Key Specifications

Pinout & Package

AP22800HB-7 is housed in a thermally enhanced U-DFN2116-8 package (2.1 mm × 1.6 mm × 0.6 mm) with exposed thermal pad (GND) on bottom for efficient heat transfer to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS22915YZPR and RT9711CGQW, AP22800HB-7 uniquely integrates soft-start, discharge control, and PG in one U-DFN2116-8 package - delivering complete rail management with minimal external components and no compromise on timing flexibility or system visibility.

Availability

AP22800HB-7 is available at Aetrix Electronics and suitable for ultrabook power sequencing, SSD power management, and tablet system rail control requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP22800HB-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP22800 belongs to Diodes' load switch product line, engineered specifically for high-efficiency, low-footprint power rail control in portable and space-constrained electronics - emphasizing programmability, thermal robustness, and system-level integration.

FAQ

What is the minimum recommended external capacitor value for soft-start on the SS pin?

The datasheet specifies a minimum CSS of 470 pF for stable soft-start operation. At VIN = 5 V, this yields ~7.3 µs rise time. Larger values (e.g., 10 nF) provide slower, more controlled ramp-up to prevent inrush-induced input droop - critical for shared power rails. Ceramic X7R 25 V rated capacitors are recommended.

Can the PG output be pulled up to a voltage higher than VOUT?

Yes - PG is rated for up to 5.5 V and may be pulled up to any supply within that range, including VCC_IO or a dedicated bias rail. However, pulling up to VOUT is preferred: when EN = low, VOUT = GND, so no current flows through the pull-up resistor - eliminating static power loss. If VOUT is unavailable, use ≥50 kΩ pull-up to avoid loading PG.

How does the AP22800HB-7 handle reverse current flow during turn-off?

The AP22800HB-7 does not include reverse-current blocking. When EN = low and VOUT > VIN, current can flow backward through the body diode of the N-channel MOSFET. To prevent this, place a Schottky diode in series with VOUT or ensure VOUT never exceeds VIN during power-down - especially important in multi-rail systems with cross-coupled capacitance.

Is the exposed thermal pad electrically isolated from other pins?

No - the exposed pad is internally connected to GND and must be soldered to a PCB ground plane. It serves dual roles: primary thermal path (R_θJC = 8.5 °C/W) and low-inductance ground return. The pad must be fully covered with solder paste and connected via ≥4 thermal vias (0.3 mm diameter) to inner/outer ground layers to achieve specified thermal performance.