Alpha & Omega Semiconductor Inc. AOZ1320CI-05

Overview

AOZ1320CI-05 from Alpha and Omega Semiconductor is a P-channel high-side load switch with fast controlled slew rate (≤500 ns), 75 mΩ typical R_DS(ON) at 5 V, 1.8–5.5 V input range, and integrated output discharge circuit. It enables inrush current limiting and safe power sequencing in portable USB-powered subsystems.

For engineers reviewing the AOZ1320CI-05 datasheet, pinout, applications, or equivalent options, key selection criteria include its sub-500 ns turn-on slew rate, 180 Ω internal discharge resistance, TTL/CMOS-compatible EN input, ultra-low 1.2 µA quiescent current, and SOT23-6 package compatibility with space-constrained mobile designs.

Technical Context

The AOZ1320CI-05 implements a gate driver with linear slew-rate control to ramp the P-MOSFET's source-to-gate voltage, achieving ≤500 ns rise time while suppressing input inrush. Its UVLO circuit disables operation below 0.9 V (typical) with 300 mV hysteresis, ensuring stable startup across 1.8–5.5 V supply rails.

It integrates an active output discharge path via an internal 180 Ω pull-down resistor activated during shutdown, discharging capacitive loads rapidly. The EN pin directly controls MOSFET conduction without external components, and logic thresholds (V_IL = 0.8 V, V_IH = 2.4 V at V_IN = 4.2–5.5 V) guarantee interoperability with standard digital interfaces.

Key Specifications

Pinout & Package

AOZ1320CI-05 is housed in a RoHS-compliant 6-pin SOT23-6 package (JEDEC MO-193C AB), with 1.6 A absolute maximum continuous switch current rating and -40°C to +85°C ambient operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS22915BYFPR and SIP32401DT-T1-GE3, AOZ1320CI-05 uniquely combines sub-500 ns slew rate, integrated 180 Ω discharge, and 75 mΩ R_DS(ON) in a 6-pin SOT23-enabling faster, safer, and more compact power sequencing than either alternative without design compromises.

Availability

AOZ1320CI-05 is available at Aetrix Electronics and suitable for USB peripheral control, smartphone subsystem enable, MP3 player battery management, and notebook USB-C port switching requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AOZ1320CI-05 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

Alpha and Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, power ICs, and advanced packaging for power conversion and management.

The AOZ1320 family was designed specifically for high-density portable electronics requiring precise, low-power, and ESD-robust load switching-addressing inrush, sequencing, and safety challenges in smartphones, wearables, and USB-C devices.

FAQ

What is the maximum continuous current rating for AOZ1320CI-05?

The AOZ1320CI-05 has a maximum continuous switch current rating of 1.6 A in its SOT23-6 package, validated across the full -40°C to +85°C ambient temperature range. This limit is defined by thermal constraints-not electrical capability-and assumes proper PCB copper area and airflow. Exceeding 1.6 A risks junction temperature exceeding 150°C, potentially triggering thermal shutdown or permanent damage. Derating curves in the datasheet confirm 1.6 A is the hard ceiling at room temperature.

Does AOZ1320CI-05 require an external pull-down resistor on the EN pin?

No, AOZ1320CI-05 does not require an external pull-down on the EN pin. Its internal input leakage current is specified at 1 µA maximum, and the EN pin has no internal weak pull-down. However, for robust noise immunity in noisy environments, a 100 kΩ external pull-down is recommended to ensure a defined logic-low state during power-up or MCU reset. The device itself functions correctly with EN left floating only if system-level noise is negligible.

How does the output discharge function operate in AOZ1320CI-05?

In AOZ1320CI-05, the output discharge function activates automatically when the EN pin transitions to logic LOW. An internal 180 Ω resistor connects the OUT pin to GND, discharging any stored energy in downstream capacitance. For example, with a 4.7 µF output capacitor charged to 5 V, the discharge time to 1 V is under 2 ms. This prevents floating voltages that could cause latch-up or false wake-ups in connected ICs, eliminating the need for external discharge circuitry.

Can AOZ1320CI-05 operate from a 1.8 V supply?

Yes, AOZ1320CI-05 is fully specified to operate from 1.8 V to 5.5 V input. At 1.8 V, its R_DS(ON) increases to 109 mΩ (max), resulting in ~218 mW conduction loss at 1 A. The UVLO remains functional down to 0.7 V (min), and EN logic thresholds scale accordingly-V_IH is 1.8 V (min) at V_IN = 1.8–2.0 V. All timing parameters, including the ≤500 ns slew rate, are maintained across the full input range.

Is AOZ1320CI-05 pin-compatible with other variants in the AOZ1320 family?

Yes, all AOZ1320CI-x variants-including AOZ1320CI-05-are pin-compatible within the SOT23-6 package. Pin numbering, IN/OUT/GND/EN/NC assignments, and footprint dimensions match exactly across -01 through -07 versions. This allows direct substitution for different slew-rate or discharge requirements without PCB redesign, provided thermal and layout constraints (e.g., copper pour for 1.6 A) remain unchanged.