Diodes Incorporated AP22908CNA4-7

Overview

AP22908CNA4-7 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 suppression in low-voltage portable systems. It operates from 1.08V to 3.6V input, delivers up to 1.5A continuous output current, features 28mΩ typical R_DS(ON) at 3.6V, 0.05µA quiescent current, and integrated output discharge (80Ω). It is used in smartphone power rail enablement and wearable device subsystem isolation.

For engineers reviewing the AP22908CNA4-7 datasheet, AP22908CNA4-7 pinout, AP22908CNA4-7 application, or AP22908CNA4-7 equivalent, this page provides verified functional identity, package-specific pin mapping, real-world timing behavior (105µs typical rise time), thermal limits (125°C max junction), and validated alternatives for voltage-rail switching in space-constrained battery-powered designs.

Technical Context

The AP22908CNA4-7 implements an internally controlled slew-rate circuit that linearly ramps V_OUT during turn-on to limit di/dt and suppress inrush current into capacitive loads. Its active-high ON pin requires ≥0.9V VIH and ≤0.38V VIL for reliable logic-level control from 1.2V–3.3V microcontrollers.

It integrates a dedicated discharge FET (R_DIS = 80Ω typical) between V_OUT and GND, enabling rapid output voltage collapse (<5µs turn-off) when disabled-critical for safe hot-swap and power-state transitions. Thermal performance is defined by R_θJA = 136°C/W (U-WLB0909-4) and maximum 735mW power dissipation at +25°C ambient.

Key Specifications

Pinout & Package

AP22908CNA4-7 is packaged in the ultra-compact U-WLB0909-4 wafer-level chip-scale package (0.88mm × 0.88mm, 0.5mm ball pitch), featuring backside laminate for mechanical reliability and solder joint integrity in portable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP22908CNA4-7, AP22653W6-7 trades discharge integration and package size for lower unit cost in non-space-constrained designs, while TCK107AG,LF offers identical packaging but sacrifices 33% current capacity and doubles rise time-making AP22908CNA4-7 optimal for 1.5A, fast-sequencing, miniaturized portable systems.

Availability

AP22908CNA4-7 is available at Aetrix Electronics and suitable for smartphone subsystem enablement, wireless earbud charging case power control, and portable medical device sequencing requiring stable component supply across extended product lifecycles.

Supply support for AP22908CNA4-7 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 power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP22908 belongs to Diodes' high-efficiency load switch product line, engineered specifically for low-voltage, high-density portable electronics where inrush control, ultra-low IQ, and miniature packaging are critical design constraints.

FAQ

What is the maximum continuous output current supported by AP22908CNA4-7?

The AP22908CNA4-7 supports 1.5A continuous output current when VIN ≥ 1.2V and ambient temperature is within –40°C to +85°C. At 1.08V input, derating applies due to increased R_DS(ON); maximum pulse current is 2.5A for pulses under 300µs at 2% duty cycle. Thermal limits must be observed using R_θJA = 136°C/W for the U-WLB0909-4 package.

Does AP22908CNA4-7 require an external discharge resistor?

No. The AP22908CNA4-7 integrates an internal discharge FET with 80Ω typical on-resistance between VOUT and GND. When the ON pin is low, this FET actively pulls the output to ground, eliminating the need for an external resistor and reducing PCB area and BOM count.

Can AP22908CNA4-7 operate from a 1.2V supply rail?

Yes. The AP22908CNA4-7 is fully specified down to 1.08V input, with 69mΩ typical R_DS(ON) at 1.2V and 200mA test current. At 1.2V, it delivers up to 1.5A continuous current, though thermal performance must be verified using worst-case R_DS(ON) (91mΩ max) and ambient conditions.

What is the recommended PCB layout for thermal management of AP22908CNA4-7?

For optimal thermal performance, use a minimum 20mm² copper pour connected to the U-WLB0909-4 package's four solder balls (VIN, VOUT, GND, ON) via multiple thermal vias to inner ground/power planes. Keep input/output capacitors within 2mm of respective pins, use ≥0.3mm-wide traces for VIN/VOUT, and avoid routing high-speed signals under the device to preserve thermal path integrity.