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Alpha & Omega Semiconductor Inc. AOZ1353DI-02
- Part No.:
- AOZ1353DI-02
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
AOZ1353DI-02.pdf
- Description:
- 5V/3A ECPOWER SMART CURRRENT LIM
- Quantity:
- Payment:
- Shipping:
Inventory:4,271
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Product details
Overview
AOZ1353DI-02 from Alpha & Omega Semiconductor is a latch-off, current-limited load switch with True Reverse-Current Blocking (TRCB), 3.4V–5.5V input range, 3.5A continuous current capability, 40mΩ typical RON, and 28V-rated VOUT pin - designed for USB PD power source switching in portable devices where fault latching and reverse-current isolation are critical.
For engineers reviewing the AOZ1353DI-02 datasheet, pinout, applications, or equivalent options, key selection considerations include its latch-off fault recovery mode, programmable current limit via external resistor, TRCB fast recovery (<100µs), 80µA quiescent current, and DFN3x3-12L thermal performance (50°C/W).
Technical Context
The AOZ1353DI-02 integrates a low-RON N-channel MOSFET power switch with independent protection circuits: UVLO (3.25V threshold), OVP (5.75V rising threshold), thermal shutdown (140°C trip, 20°C hysteresis), and TRCB (60mV rising trip point). Its control logic enforces latch-off behavior after over-current or thermal faults - requiring EN toggle or VIN recycle to reset.
Current limiting is set by an external 1% resistor on ILIM (e.g., 14.3kΩ → 1A), with 12ms flag delay (FLTB) before latching. Soft-start time is adjustable via CSS capacitor (0.3ms–3.4ms), and TRCB recovery occurs within 100µs after VOUT–VIN falls below 70mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 5.5V - supports single-cell Li-ion and USB 5V rails without external regulation. |
| Continuous Current Rating | 3.5A - enables high-power USB PD sink applications with margin at 85°C ambient. |
| RON (Typical) | 40mΩ at VIN = 5V - limits conduction loss to ≤700mW at 3.5A, reducing thermal stress. |
| VOUT Absolute Max | +28V - allows safe operation during transient overvoltage events on output side. |
| Quiescent Current | 80µA - minimizes battery drain in always-on system power domains. |
| Fault Recovery Mode | Latch-off - prevents automatic restart after over-current/thermal fault, enhancing system safety in unattended operation. |
| TRCB Response Time | 2µs - blocks reverse current before damaging backfeed can occur in multi-rail systems. |
Pinout & Package
AOZ1353DI-02 uses a thermally enhanced DFN3x3-12L package with exposed pad (EXP) tied to GND for improved heat dissipation (θJA = 50°C/W). The 3mm × 3mm footprint supports high-density PCB layouts while maintaining robust thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, VOUT | Power output terminal | Internally paralleled pins rated for 28V max; connects to USB VBUS or downstream rail - must handle full 3.5A load current. |
| 4, FLTB | Fault indicator (open-drain) | Active-low signal pulled low after 12ms OCP delay or immediately on thermal fault; requires external pull-up to host logic rail. |
| 5, SS | Soft-start timing control | Capacitor-to-GND sets turn-on ramp time (0.3–3.4ms); shorting to GND fixes 3.4ms default for predictable inrush control. |
| 6, NC | No-connect terminal | Not internally bonded; may be left floating or tied to GND for mechanical stability - no electrical function. |
| 7, GND | Ground reference | Main return path for switch current and internal bias; must be low-impedance connection to EXP pad for thermal and noise integrity. |
| 8, ILIM | Current limit set input | Connects to 1% resistor to GND; sets precise current threshold (e.g., 14.3kΩ → 1A) using ILIM = 14300/RLIM (A). |
| 9, EN | Enable control input | Active-high logic interface (1.4V min high threshold); toggling resets latch-off state after fault clearance. |
| 10, 11, 12, VIN | Supply input terminal | Internally paralleled pins accepting 3.4–5.5V; powers internal regulator and gate driver - requires ≥10µF local ceramic decoupling. |
| EXP | Exposed thermal pad | Must be soldered to solid GND plane; primary thermal path for die heat removal - critical for sustained 3.5A operation. |
Key Features
| Feature | Design Value |
|---|---|
| True Reverse-Current Blocking (TRCB) | Blocks VOUT→VIN backfeed at 60mV differential with 2µs response - eliminates need for external reverse-blocking diode in dual-supply systems. |
| Latch-Off Fault Recovery | Halts automatic restart after over-current or thermal fault until EN is toggled - prevents uncontrolled cycling during persistent overload. |
| Programmable Current Limit | Set via single 1% resistor (ILIM pin); supports 0.5A–3.5A range with ±10% accuracy - enables precise system-level current budgeting. |
| Adjustable Soft-Start | Configurable 0.3–3.4ms turn-on time via CSS capacitor - suppresses inrush into large output capacitance (e.g., USB PD 10µF VBUS limit). |
| Low Quiescent Power | 80µA operating current and <1µA shutdown current - extends battery life in always-on power-path monitoring applications. |
| OVP + UVLO + Thermal Protection | Independent, simultaneous monitoring of input over-voltage (5.75V), under-voltage (3.25V), and junction temperature (140°C) - ensures robust fault coverage without software intervention. |
Applications
| USB PD Power Source Switch | Smartphone/Tablet Power Path |
|---|---|
|
Use Scenario: Isolating USB-C VBUS from system PMIC during hot-plug or fault conditions in portable devices. IC Role / Device Role / Timing Role: Load switch controlling power delivery path with latch-off OCP to prevent unsafe auto-restart during cable short. Use Value: Eliminates risk of repeated inrush into shorted cables; TRCB prevents battery discharge through VBUS when system is off. |
Use Scenario: Managing power routing between battery, USB adapter, and system rails in battery-powered consumer electronics. IC Role / Device Role / Timing Role: High-side power switch enabling/disabling adapter input with precise current limiting and reverse isolation. Use Value: Enables safe 3.5A adapter charging while blocking reverse current from battery to VBUS - critical for USB OTG compliance. |
| Notebook/Ultrabook System Power | Portable Device Hot-Swap Protection |
|
Use Scenario: Providing controlled 5V rail enablement for peripheral ports or docking interfaces with overvoltage resilience. IC Role / Device Role / Timing Role: Protected power switch with 28V VOUT rating handling transient surges on external connectors. Use Value: Withstands 5.75V OVP threshold and 28V absolute max - protects downstream logic from ESD or misconnected adapters. |
Use Scenario: Safely enabling/disabling auxiliary power rails (e.g., SSD, display, or sensor modules) during runtime insertion/removal. IC Role / Device Role / Timing Role: Latch-off load switch ensuring power remains off after hot-swap fault until explicit host reset. Use Value: Prevents bus corruption or data loss by eliminating uncontrolled power cycling during module replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limited load switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCK127BG, Toshiba | Latch-off mode; 5.5V max input; 2.5A rating; no TRCB; 65mΩ RON | Lacks True Reverse-Current Blocking and has lower current rating - unsuitable for USB PD 3.5A or reverse-isolation-critical designs. | Select only if TRCB and >3A capability are not required, and board space allows larger thermal footprint. |
| TPS22975, Texas Instruments | Auto-restart fault recovery; 5.5V input; 4A rating; TRCB supported; 32mΩ RON | Different fault behavior (auto-restart vs. latch-off) - may cause unsafe cycling in persistent fault scenarios without host supervision. | Prefer for systems with active fault management; avoid where latch-off safety is mandated by design standards. |
Compared with TCK127BG and TPS22975, AOZ1353DI-02 uniquely combines latch-off recovery, 3.5A capacity, 40mΩ RON, and certified TRCB in a 3×3mm DFN - making it optimal for USB PD sources requiring fail-safe, reverse-isolated power control without software intervention.
Availability
AOZ1353DI-02 is available at Aetrix Electronics and suitable for USB PD power source switching, smartphone/tablet power path management, notebook system rail control, and portable device hot-swap protection requiring stable component supply across production lifecycles.
Supply support for AOZ1353DI-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, IGBTs, and intelligent power solutions for computing, consumer, and industrial markets.
The AOZ1353DI-02 belongs to AOS's ECPower™ smart load switch family, engineered for USB PD, mobile, and portable applications demanding integrated protection, ultra-low IQ, and compact thermal packaging.
FAQ
What fault conditions trigger latch-off behavior in the AOZ1353DI-02?
The AOZ1353DI-02 enters latch-off state upon detection of over-current (via ILIM resistor), over-temperature (140°C junction), or over-voltage (5.75V at VIN). Unlike auto-restart variants, it remains off until EN is toggled or VIN is recycled - ensuring no uncontrolled re-enabling during persistent faults. This behavior is confirmed in the Ordering Information table and Functional Description section of Rev. 1.6 datasheet.
How is the current limit threshold set for AOZ1353DI-02, and what resistor value yields 3.5A?
The AOZ1353DI-02 current limit is set by a 1% resistor (RLIM) from ILIM pin to GND, using the formula ILIM = 14300 / RLIM (A). For 3.5A, RLIM = 14300 / 3.5 ≈ 4.09kΩ - a standard 4.02kΩ 1% resistor achieves 3.5A nominal (3.08–3.92A range per Electrical Characteristics table). This calculation and tolerance band are explicitly defined in the datasheet's Over-Current Protection section.
Does AOZ1353DI-02 provide True Reverse-Current Blocking when disabled (EN = low)?
Yes - AOZ1353DI-02 provides True Reverse-Current Blocking (TRCB) in both enabled and disabled states. When VOUT exceeds VIN by 60mV, the internal switch turns off regardless of EN status, preventing backfeed from output to input. Recovery occurs when VOUT falls 70mV below VIN, with <100µs turn-on time. This dual-state blocking is specified in the General Description and Functional Description sections.
What is the maximum recommended output capacitance for AOZ1353DI-02, and why?
The maximum recommended output capacitance for AOZ1353DI-02 is constrained by soft-start timing and current limit: COUT ≤ ILIM × tON / VIN. With 3.5A limit and 3.4ms default tON at 5V, COUT ≤ 2.38µF - but USB PD specification caps VBUS capacitance at 10µF. Therefore, AOZ1353DI-02 is validated for ≤10µF, provided soft-start is adjusted downward (e.g., 1nF CSS → 0.3ms tON) to ensure full charge. This guidance appears in the Output Capacitor Selection section.
How does the FLTB pin behave during over-current events on AOZ1353DI-02?
During over-current, FLTB is pulled low after a fixed 12ms delay (tOCP_FLTB) once IOUT ≥ ILIM. For AOZ1353DI-02 (latch-off version), the power switch turns off an additional 12ms later - and FLTB remains low until EN is toggled or VIN is recycled. This two-stage flagging (delayed assertion + sustained low during latch) is distinct from auto-restart variants and is documented in the Fault Reporting section of Rev. 1.6.
AOZ1353DI-02 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 12-VFDFN Exposed Pad
- Series:
- ECPower™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Type:
- USB Switch
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- N-Channel
- Interface:
- On/Off
- Voltage - Load:
- 3.4V ~ 5.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 3.5A
- Rds On (Typ):
- 40mOhm
- Input Type:
- Non-Inverting
- Features:
- Latch Function
- Fault Protection:
- Current Limiting (Adjustable), Over Temperature, Over Voltage, Short Circuit, UVLO
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
AOZ1353DI-02 FAQ
1.How can I place an order for AOZ1353DI-02 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ1353DI-02 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AOZ1353DI-02 reliable?
The price and inventory of AOZ1353DI-02 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ1353DI-02 is usually 5 days.
3.What payment methods are accepted for AOZ1353DI-02?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ1353DI-02 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ1353DI-02?
AOZ1353DI-02 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ1353DI-02 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AOZ1353DI-02?
For technical support, including AOZ1353DI-02 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ1353DI-02 requirements.
6.How does Aetrix verify that AOZ1353DI-02 is sourced from the original manufacturer or authorized distributors?
All AOZ1353DI-02 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AOZ1353DI-02 meets industry standards.
7.What is the process for return or replacement of AOZ1353DI-02?
All AOZ1353DI-02 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ1353DI-02, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AOZ1353DI-02 part is unused and in its original packaging.
Return procedure for AOZ1353DI-02:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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