Alpha & Omega Semiconductor Inc. AOZ1390DI-02

Overview

AOZ1390DI-02 from Alpha & Omega Semiconductor is a latch-off ideal diode protection switch for USB PD multi-port power ORing, providing reverse current blocking, 18 mΩ typical R_ON, 3.3 V–23 V input range, and integrated LPS fault coordination across ports. It operates in high-side configuration with thermal shutdown, over-voltage, and short-circuit protection.

For engineers reviewing the AOZ1390DI-02 datasheet, pinout, applications, or equivalent options, key selection considerations include latch-off fault response (vs. auto-restart), 2.5 s LPSB debounce timing, VIN discharge capability, IDTRCB regulation at 35 mV, and DFN3.5×3-14L thermal pad layout requirements.

Technical Context

The AOZ1390DI-02 implements back-to-back N-channel MOSFETs with gate drive and charge pump to enable true reverse-current blocking (IDTRCB) and programmable soft-start via external CSS capacitor. Its control logic enforces latch-off behavior on OVP, TSD, and startup SCP-requiring EN toggle or VIN cycle for recovery.

It integrates dedicated LPS detection (6.3 V threshold, 2.5 s blanking) that asserts LPSB low when EN = 0 V and VIN exceeds threshold, enabling coordinated shutdown of other ports via DISB. FLTB provides open-drain fault reporting for thermal, over-voltage, and short-circuit events.

Key Specifications

Pinout & Package

AOZ1390DI-02 is housed in a thermally enhanced DFN3.5 mm × 3 mm, 14-lead package with exposed thermal pad (EXP) tied to internal drain node. The EXP pad must be soldered to isolated copper thermal planes using multiple vias for junction-to-board thermal resistance of 2 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AOZ1390DI-01 and TPS2410RGER, AOZ1390DI-02 uniquely combines latch-off safety enforcement, integrated LPS fault signaling, and compact DFN3.5×3-14L packaging - making it optimal for certified USB PD multi-port systems where deterministic fault containment is mandatory.

Availability

AOZ1390DI-02 is available at Aetrix Electronics and suitable for USB PD multi-port ORing, high-end laptop power input, smartphone dual-charger isolation, and industrial docking station designs requiring stable component supply with guaranteed RoHS-compliant sourcing.

Supply support for AOZ1390DI-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 & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, power ICs, and advanced packaging for power management applications.

The AOZ1390DI product line delivers ECPower™ ideal diode switches optimized for USB Type-C PD systems, emphasizing reverse-current blocking, multi-port coordination, and robust fault containment in thermally constrained form factors.

FAQ

What fault conditions cause AOZ1390DI-02 to latch off permanently?

AOZ1390DI-02 latches off upon detection of over-voltage (VIN > 24 V), thermal shutdown (TJ ≥ 140 °C), or startup short-circuit (SCP) after four 2 ms retry attempts. Unlike AOZ1390DI-01, it does not auto-restart. Recovery requires toggling the EN pin or cycling VIN - ensuring no uncontrolled re-engagement during persistent faults. This behavior is hard-coded in the AOZ1390DI-02 silicon revision.

How does AOZ1390DI-02 implement Limited Power Source (LPS) protection?

AOZ1390DI-02 monitors VIN while EN = 0 V; if VIN exceeds 6.3 V for 2.5 s, LPSB pulls low. This signal can drive DISB pins of other AOZ1390DI-02 devices in multi-port systems, forcing coordinated shutdown. LPSB clears only when VIN drops below 6.15 V or EN is asserted - not when DISB returns high. AOZ1390DI-02 uses this to prevent uncontrolled power flow from a shorted port into the shared VOUT bus.

Can AOZ1390DI-02 replace AOZ1390DI-01 in an existing design?

No direct replacement is recommended without validation. AOZ1390DI-02's latch-off behavior changes system-level fault handling: OVP, TSD, and SCP now require manual or controller-initiated reset instead of auto-restart. Layout, thermal management, and firmware must be updated to accommodate the absence of automatic recovery cycles. Pinout and electrical specs are identical, but fault-state persistence alters system safety architecture.

What is the purpose of the CAP pin on AOZ1390DI-02?

The CAP pin on AOZ1390DI-02 connects to an internal bias network and requires a 1 nF capacitor to GND for stable operation. No external load or signal routing is permitted. This capacitor stabilizes internal charge pump and gate driver references; omitting it causes erratic switching, false fault flags, or failure to regulate IDTRCB. It is not a filter or bypass node - its sole function is internal bias integrity.

How does AOZ1390DI-02 achieve True Reverse Current Blocking (IDTRCB)?

AOZ1390DI-02 achieves IDTRCB by continuously regulating VOUT to maintain a 35 mV drop below VIN. When VOUT approaches or exceeds VIN - due to backfeed from batteries, secondary supplies, or parasitic coupling - the gate driver reduces conduction until the MOSFETs fully block. This occurs in <40 µs, verified in Figure 10 of the datasheet, and functions independently of load current or EN state, ensuring zero reverse current under all operating conditions.