Alpha & Omega Semiconductor Inc. AOZ1300AI

Overview

AOZ1300AI from Alpha & Omega Semiconductor is a high-side, current-limited N-channel MOSFET power distribution switch in SO-8 package, operating from 2.7V to 6.0V input supply, delivering up to 4A continuous load current with 40mΩ max R_DS(ON), programmable current limit via external resistor, and open-drain fault indicator for over-current/thermal events - used in USB host power distribution and hot-plug server modules.

For engineers reviewing the AOZ1300AI datasheet, pinout, applications, or equivalent options, key selection considerations include its 24ms fault blanking time, reverse current blocking capability, adjustable slew rate control via external capacitor, 1µA shutdown current, and thermal latch behavior requiring EN toggle or power recycle after fault clearance.

Technical Context

The AOZ1300AI integrates a high-side N-channel MOSFET with internal charge pump gate driver, current-sensing using R_DS(ON), and thermal shutdown circuitry that triggers at +120°C junction temperature. Its enable logic is active-high with UVLO (2.3V turn-on, 2.0V turn-off) and 400mV hysteresis.

It implements a latched fault mode: over-current or thermal events lasting >24ms assert FLT low and disable OUT until EN is toggled or VIN is cycled. Slew rate is internally set to ≥400µs rise time and can be extended using an external capacitor on the SLEW pin (0.001–0.1µF).

Key Specifications

Pinout & Package

AOZ1300AI is housed in a RoHS-compliant SO-8 (SO-8L) surface-mount package with standard 1.27mm pitch, 4.9mm × 6.0mm body, and exposed thermal pad (not electrically connected). Pin 7 (IC) is internally connected and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDR and AP22653AW5-7, the AOZ1300AI provides uniquely configurable current limiting, reverse current blocking, and latched fault behavior - making it optimal for high-reliability hot-plug systems where diagnostic visibility and fail-safe isolation are mandatory.

Availability

AOZ1300AI is available at Aetrix Electronics and suitable for USB host distribution, server hot-plug modules, notebook docking stations, RAID backplanes, and telecom power management requiring stable component supply across industrial temperature range (-40°C to +85°C).

Supply support for AOZ1300AI 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, power ICs, and advanced packaging for power conversion and distribution.

The AOZ1300AI belongs to AOS's programmable power distribution switch product line, designed specifically for robust, high-current hot-plug applications in computing, storage, and communications infrastructure where precision current limiting and fault visibility are critical.

FAQ

What is the maximum programmable current limit for AOZ1300AI?

The AOZ1300AI supports a programmable current limit ranging from 0.5A to 4.5A using an external resistor on the ISET pin. At 76.8kΩ, the device delivers a nominal 4.0A limit across –40°C to +85°C ambient, with ±20% tolerance over temperature and input voltage. This range allows precise tailoring to load requirements without redesigning the power path.

Does AOZ1300AI support reverse current blocking, and how does it function?

Yes, AOZ1300AI provides inherent reverse current blocking: when V_OUT exceeds V_IN, the internal N-channel MOSFET's body diode is reverse-biased and the gate drive is disabled, preventing backflow. This eliminates the need for an external Schottky diode in redundant or battery-backed systems. The feature is intrinsic to the high-side architecture and requires no configuration.

How does the 24ms fault blanking time in AOZ1300AI improve system reliability?

The 24ms fault blanking time in AOZ1300AI prevents false FLT assertions during benign inrush events - such as plugging a 1000µF-load USB device - by ignoring over-current conditions shorter than this window. Only sustained faults trigger latched shutdown. This avoids unnecessary port disablement in hot-plug scenarios while preserving protection against true shorts or overloads.

Can AOZ1300AI be used without connecting the SLEW pin?

Yes, AOZ1300AI operates with SLEW pin left open, resulting in the minimum output slew rate (~400µs rise time). This default setting suffices for most USB and peripheral applications. An external capacitor (0.001–0.1µF) is only required when slower ramping is needed - for example, to limit inrush into large bulk capacitance or meet specific EMC targets - and must be rated ≥6.3V.

What thermal behavior does AOZ1300AI exhibit during overload, and how is recovery handled?

AOZ1300AI triggers thermal shutdown at +120°C junction temperature, asserting FLT and latching OFF. Recovery requires die cooling below +110°C *plus* toggling EN or recycling VIN - the latch does not auto-reset. This ensures fault persistence for diagnostics. Thermal resistance Θ_JA is 87°C/W on a 1-in² 2oz copper board, so power dissipation must be managed via layout and airflow per the datasheet's PCB guidelines.