Alpha & Omega Semiconductor Inc. AOZ1356LI-02

Overview

AOZ1356LI-02 from Alpha and Omega Semiconductor is a 5V/3A ECPower™ protection switch with latch-off fault recovery, 3.4V–5.5V input range, 34mΩ typical R_ON, True Reverse-Current Blocking (TRCB), and USB PD Fast Role Swap support - deployed in USB PD power source switching for smartphones and tablets.

For engineers reviewing the AOZ1356LI-02 datasheet, pinout, applications, or equivalent options, key selection criteria include latch-off behavior (vs. auto-restart), programmable current limit via RLIM, 28V VOUT rating, fast recovery from TRCB (80µs), and WLCSP-12 package compatibility with high-density portable PCB layouts.

Technical Context

The AOZ1356LI-02 implements a latch-off fault response: upon over-current, over-voltage, thermal shutdown, or reverse-current event, the device remains off until EN is toggled or VIN is cycled. Its TRCB circuit blocks reverse current at 25mV V_OUT–V_VIN threshold and recovers in 80µs after condition removal.

It supports USB PD Fast Role Swap via FON pin activation, enabling sub-100µs VOUT rise to >4.75V during role transition. The programmable current limit uses ILIM pin with external 1% resistor (e.g., 14.3kΩ for 1A), and OVP triggers at 5.6–6.0V with 250mV hysteresis.

Key Specifications

Pinout & Package

AOZ1356LI-02 is housed in a 1.31mm × 1.81mm WLCP (Wafer-Level Chip-Scale Package) with 0.4mm pitch and 12 solder bumps.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AOZ1356LI-02, AOZ1356LI-01 offers identical electrical specs but auto-restarts after faults - compromising safety in systems requiring explicit reset. TCK112G,314 provides basic load switching in larger SOT-23 but omits TRCB, FRS, and latch-off, limiting use to simpler 5V rail control.

Availability

AOZ1356LI-02 is available at Aetrix Electronics and suitable for USB PD power source switching, smartphone/tablet VBUS protection, and notebook ultrabook power path management requiring stable component supply and long-term lifecycle support.

Supply support for AOZ1356LI-02 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 MOSFETs, power ICs, and protection solutions for computing, consumer, and industrial markets.

The AOZ1356LI product line delivers integrated ECPower™ protection switches optimized for USB Type-C and Power Delivery applications, combining high-current capability, ultra-small WLCSP packaging, and comprehensive fault coverage.

FAQ

What fault conditions cause AOZ1356LI-02 to latch off, and how is it reset?

AOZ1356LI-02 latches off on over-current, over-voltage, thermal shutdown, or reverse-current events. Unlike auto-restart versions, it remains disabled until the EN pin is toggled high-low-high or VIN is cycled. This behavior is confirmed in the datasheet's Functional Description section and Ordering Information table for -02 variant. The FLTB pin stays low during latch-off and returns to high-impedance only after reset. AOZ1356LI-02's latch-off ensures controlled system-level fault handling.

How does AOZ1356LI-02 support USB PD Fast Role Swap, and what pins are involved?

AOZ1356LI-02 supports USB PD Fast Role Swap via coordinated use of the FON and EN pins: FON must be driven high before EN to enable fast turn-on mode (50–100µs), and TRCB recovery occurs in 80µs after reverse-bias removal. This combination meets USB PD Rev 3.0 FRS timing for VOUT restoration >4.75V. The datasheet confirms this in General Description, Functional Block Diagram, and Timing Diagrams. AOZ1356LI-02's FON pin is essential for achieving sub-100µs response.

What is the maximum programmable current limit for AOZ1356LI-02, and how is it set?

The AOZ1356LI-02 supports a maximum programmable current limit of 3.92A using a 4.02kΩ 1% resistor from ILIM to GND, per the Electrical Characteristics table (ILIM = 14300/R_LIM). At 14.3kΩ, the limit is 1A; at 29.4kΩ, it drops to 0.5A. The ILIM pin voltage is internally regulated, and the current limit threshold varies ±5% with temperature. AOZ1356LI-02 requires precision resistors to maintain accuracy across operating conditions.

Does AOZ1356LI-02 provide reverse-current blocking when disabled, and what is the trip point?

Yes, AOZ1356LI-02 provides True Reverse-Current Blocking (TRCB) in both enabled and disabled states. It trips when V_OUT exceeds V_VIN by 25mV (VT_RCB), and releases when V_VIN exceeds V_OUT by 40mV (VR_RCB), yielding 65mV hysteresis. This prevents backfeed from output to input during hot-plug or adapter disconnection. The TRCB function is intrinsic to AOZ1356LI-02's architecture and requires no external components.

What package type and dimensions does AOZ1356LI-02 use, and what are its thermal characteristics?

AOZ1356LI-02 uses a 1.31mm × 1.81mm WLCP (Wafer-Level Chip-Scale Package) with 0.4mm pitch and 12 solder bumps. Its package thermal resistance is 84°C/W (θ_JA), and it features a 140°C thermal shutdown threshold with 20°C hysteresis. The small WLCSP footprint enables high-density placement near USB-C connectors, while the thermal spec ensures safe operation up to 85°C ambient under 3.5A load. AOZ1356LI-02's thermal performance is validated in Typical Characteristics Figures 15–16.