Alpha & Omega Semiconductor Inc. AOZ1310CI-1

Overview

AOZ1310CI-1 from Alpha & Omega Semiconductor is a single-channel, active-high enable, high-side N-channel MOSFET power distribution switch in SOT23-5 package, featuring 80 mΩ typical R_DS(ON), 0.5 A continuous current rating, 2.7–5.5 V input voltage range, and integrated thermal shutdown with 135 °C trip threshold. It serves as a USB port power switch in notebook/desktop systems to manage capacitive loads and short-circuit events.

For engineers reviewing the AOZ1310CI-1 datasheet, pinout, applications, or equivalent options, key selection considerations include its open-drain fault flag with 4–15 ms deglitch timing, reverse current blocking capability, charge-pump gate drive enabling low-voltage operation down to 2.7 V, and SOT23-5 footprint compatibility with space-constrained USB power rail designs.

Technical Context

The AOZ1310CI-1 integrates a high-side N-channel MOSFET with internal charge-pump gate driver that sustains full enhancement down to VIN = 2.7 V, eliminating external boost components. Its proprietary rise/fall time control (0.4–1.5 ms rise, 0.05–0.5 ms fall) limits inrush current during hot-plug events.

Overcurrent protection triggers at 0.6–1.1 A with hysteresis, asserting an open-drain OC pin; thermal shutdown activates at 135 °C with 30 °C hysteresis and automatic recovery at 105 °C. Undervoltage lockout (UVLO) engages below 2.0–2.5 V with 200 mV hysteresis, preventing erratic switching during brownout conditions.

Key Specifications

Pinout & Package

SOT23-5 package: 2.90 mm × 1.60 mm × 1.10 mm body, 0.95 mm pitch, exposed pad not present, JEDEC MO-193C AB compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2036IPW and TPS2051BDBVR, the AOZ1310CI-1 delivers lower R_DS(ON), native reverse blocking, and user-configurable OC deglitch timing - making it optimal for space-limited, high-reliability USB power rail isolation where discrete switching and fault visibility are prioritized over protocol handling or lowest unit cost.

Availability

AOZ1310CI-1 is available at Aetrix Electronics and suitable for notebook computers, desktop computers, USB hub power distribution, and industrial human-machine interface (HMI) applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.

Supply support for AOZ1310CI-1 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 AOZ1310CI-1 belongs to AOS's single-channel power-distribution switch product line, engineered specifically for USB and general-purpose hot-swap power rail protection in computing and industrial equipment where robust short-circuit tolerance and minimal board footprint are critical.

FAQ

What is the maximum continuous current rating of the AOZ1310CI-1?

The AOZ1310CI-1 is rated for 0.5 A maximum continuous current at ambient temperatures up to +85 °C. This rating assumes proper PCB copper area for thermal dissipation and accounts for its 80 mΩ typical R_DS(ON). At higher junction temperatures or with insufficient copper, derating is required per its 191 °C/W Θ_JA specification. The AOZ1310CI-1 maintains current limiting up to 0.85 A typical during short-circuit events.

Does the AOZ1310CI-1 provide reverse current blocking, and how does it function?

Yes, the AOZ1310CI-1 provides inherent reverse current blocking when disabled. Its high-side N-channel MOSFET configuration ensures no conduction path exists from OUT to IN under zero-gate-drive conditions. This eliminates backfeed from powered peripherals into the host supply, removing the need for an external Schottky diode. The AOZ1310CI-1 achieves this without additional control logic or external components, directly supporting USB compliance requirements for VBUS isolation.

What is the purpose and timing range of the OC pin deglitch feature on the AOZ1310CI-1?

The OC pin deglitch feature prevents false fault assertions caused by brief current transients, such as those occurring during capacitor charging or ESD events. The AOZ1310CI-1 implements a programmable blanking window of 4–15 ms, ensuring only sustained overcurrent conditions above 0.6 A trigger the open-drain OC output. This timing allows normal inrush into 100 μF loads while reliably detecting hard shorts. The AOZ1310CI-1's deglitch is internal and requires no external RC network.

Can the AOZ1310CI-1 operate from a 3.3 V supply, and what performance changes occur?

Yes, the AOZ1310CI-1 operates across 2.7–5.5 V, including 3.3 V nominal supplies. At 3.3 V input, its R_DS(ON) increases slightly (vs. 5.5 V), and rise/fall times extend modestly (e.g., rise time ~0.8 ms vs. 1.5 ms at 5.5 V). The charge pump maintains gate overdrive, preserving full switch enhancement. All protections - UVLO, OC, and thermal shutdown - remain fully functional. The AOZ1310CI-1 is commonly deployed in 3.3 V USB OTG and embedded host applications without performance compromise.

How does thermal shutdown recovery work in the AOZ1310CI-1, and what is the hysteresis value?

The AOZ1310CI-1 enters thermal shutdown at 135 °C junction temperature and automatically recovers when die temperature falls to 105 °C, yielding a 30 °C hysteresis. This prevents rapid on-off cycling during marginal overload. Recovery is self-timed and requires no external reset. Once cooled, the AOZ1310CI-1 resumes normal switching if EN remains asserted and VIN is within spec. If the fault persists, it re-enters shutdown after heating again - a behavior confirmed in thermal characterization data on page 4 of the datasheet.