Alpha & Omega Semiconductor Inc. AOZ1363DI

Overview

AOZ1363DI from Alpha Omega Semiconductor is a 5V–16V high-side load switch with 40 mΩ max R_DS(ON), 6A continuous current capability, 100 ns overcurrent fault response, and ±10% current monitoring accuracy at 3A. It integrates thermal shutdown, input overvoltage protection (19 V), undervoltage lockout (4.4 V), and externally programmable soft-start for hot-swap applications in notebook PCs and micro-servers.

For engineers reviewing the AOZ1363DI datasheet, pinout, applications, or equivalent options, this page delivers verified specifications including fast 100 ns OCP turn-off, DFN-12L package layout guidance, current sense output (ISEN) interface design, and thermal derating curves - all critical for high-reliability power rail control and fault-aware system design.

Technical Context

The AOZ1363DI employs an N-channel MOSFET with integrated gate driver and fast current-limit detection circuitry that triggers latch-off within 100 ns when load current exceeds 11 A at 25°C. Its current monitor outputs a precision 5 µA/A scaled signal referenced to ISEN pin, enabling real-time load diagnostics without external amplification.

Protection logic includes independent UVLO (4.4 V threshold, 400 mV hysteresis), OVP (19 V trip, 1.5 V hysteresis), and thermal shutdown (130 °C, 30 °C hysteresis), all with deglitch filtering. The SS pin accepts an external capacitor to set soft-start time (e.g., 100 µs with 300 pF), limiting inrush into capacitive loads during hot-plug events.

Key Specifications

Pinout & Package

AOZ1363DI uses a 3 mm × 3 mm DFN-12L package with exposed thermal pad (EPAD). Pin 1 is EN (enable), and pins 5/EPAD and 10–12 are electrically connected to IN and OUT respectively for high-current routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS22965DRLR and RT9711CGQW, the AOZ1363DI uniquely combines 6 A current capacity, 100 ns OCP, current monitoring, and 19 V OVP in a single DFN-12L package - making it the only option for robust 12 V hot-swap systems requiring both telemetry and multi-layer protection.

Availability

AOZ1363DI is available at Aetrix Electronics and suitable for notebook PC power sequencing, micro-server hot-swap supplies, and industrial I/O module protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AOZ1363DI 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 Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, load switches, and power ICs for computing, communications, and industrial markets.

The AOZ1363DI belongs to AOS's high-current load switch product line, designed specifically for hot-plug-capable power distribution in space-constrained, thermally demanding applications such as ultrabooks and edge servers.

FAQ

What is the maximum continuous current rating for the AOZ1363DI under typical operating conditions?

The AOZ1363DI supports 6 A of continuous current at 25 °C ambient temperature. Derating applies above 25 °C due to its 40 °C/W junction-to-ambient thermal resistance; at 85 °C ambient, the practical continuous current drops to approximately 4.5 A. This rating assumes proper PCB copper area for the exposed pad and adequate airflow per the recommended layout guidelines on page 10 of the datasheet. The AOZ1363DI maintains this performance without external heatsinking.

How does the AOZ1363DI implement current monitoring, and what accuracy can be expected?

The AOZ1363DI provides current monitoring via the ISEN pin, which outputs a voltage proportional to load current using an internal gain of 5 µA/A plus a 2 µA offset. With a 100 kΩ sense resistor, the output is 3.2 V at 3 A - delivering ±10 % accuracy as specified in the Electrical Characteristics table. This analog output requires no external amplification and interfaces directly with MCU ADCs or comparator circuits. The AOZ1363DI's ISEN function is calibrated and tested at 3 A, not extrapolated.

What protection features does the AOZ1363DI include, and how do they behave during fault conditions?

The AOZ1363DI integrates five independent protections: undervoltage lockout (UVLO, 4.4 V trip), overvoltage protection (OVP, 19 V trip), overcurrent protection (OCP, 11 A trip), thermal shutdown (OTP, 130 °C), and soft-start control. During OCP or OTP, the device latches off and pulls FLT_B low; UVLO and EN deactivation place it in high-impedance shutdown. All protections include deglitch filtering to prevent false triggering. The AOZ1363DI does not auto-recover from latch-off faults - reset requires cycling EN or power.

Can the AOZ1363DI be used in parallel configurations, and what layout considerations apply?

Yes, the AOZ1363DI supports parallel operation to increase current capacity or improve thermal distribution. Per page 8 of the datasheet, EN pins are tied together, VCC pins share a common 5 V rail with individual 0.47 nF bypass caps, and FLT_B outputs are wire-OR'd. Each unit requires its own ISEN resistor (e.g., 50 kΩ for two devices), and output traces must be wide and symmetric. The AOZ1363DI's matched propagation delays ensure simultaneous turn-on and balanced current sharing when layout symmetry is maintained.

What is the purpose of the SS (soft-start) pin, and how is its timing determined?

The SS pin controls the gate voltage ramp rate during turn-on to limit inrush current into capacitive loads. An external capacitor (CSS) between SS and GND sets the soft-start time: t_SS ≈ 100 µs with 300 pF, per the Electrical Characteristics table. Larger CSS values extend ramp time linearly, allowing precise control of dI/dt without adding external circuitry. The AOZ1363DI's SS pin operates independently of EN timing and remains active only during the initial turn-on phase - it has no effect during normal steady-state operation or fault recovery.