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Alpha & Omega Semiconductor Inc. AOZ1353LI-04
- Part No.:
- AOZ1353LI-04
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package:
- 12-UFBGA, WLCSP
- Datasheet:
-
AOZ1353LI-04.pdf
- Description:
- 5V/3A LOAD SWITCH WITH LATCH-OFF
- Quantity:
- Payment:
- Shipping:
Inventory:2,274
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Product details
Overview
AOZ1353LI-04 from Alpha & Omega Semiconductor is a latch-off, fast-shutdown 5V/3A ECPower™ protection switch with true reverse-current blocking (TRCB), 32mΩ typical RON, 28V VOUT rating, and programmable current limit via external resistor RLIM. It serves as a robust USB PD power source switch in portable computing and mobile devices requiring high-reliability over-voltage, over-current, thermal, and reverse-current protection.
For engineers reviewing the AOZ1353LI-04 datasheet, pinout, applications, or equivalent options, key selection considerations include its WLCSP-12 package footprint, latch-off fault response behavior, fast shutdown vs. auto-restart variants, TRCB recovery time (<100µs), and compatibility with USB Type-C VBUS switching architectures.
Technical Context
The AOZ1353LI-04 integrates a low-RON N-channel MOSFET power switch with independent protection comparators for over-voltage (5.5–6.0V threshold), over-current (programmable 0.45–3.92A), reverse-current (20mV trip, 40mV release), and thermal shutdown (140°C with 20°C hysteresis). Its latch-off behavior requires EN pin toggle or VIN recycle to clear faults - unlike auto-restart variants.
Control logic includes UVLO (3.25V rising, 150mV hysteresis), enable input with 1.4V logic-high threshold, open-drain FLTB fault indicator, and soft-start timing adjustable via external CSS capacitor (0.3–3.4ms range). The device draws only 6µA in shutdown and 125µA quiescent current during operation.
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. |
| Max VOUT Rating | 28V - enables safe operation during USB PD voltage negotiation and transient surges on VBUS. |
| RON (Typ.) | 32mΩ at 5V/1A - limits conduction loss to ≤160mW at 3.5A, reducing thermal stress in compact layouts. |
| Current Limit Range | 0.45A to 3.92A - set by external RLIM (29.4kΩ to 4.02kΩ); enables precise load matching for diverse USB-powered peripherals. |
| OVP Response Delay | 2µs - ensures sub-microsecond cutoff during fast-rising over-voltage events, protecting downstream circuitry. |
| TRCB Recovery Time | <100µs - restores power rapidly after reverse-bias removal, minimizing system interruption in bidirectional power paths. |
| Shutdown Current | 6µA - preserves battery life in always-on systems where the switch remains disabled for extended periods. |
Pinout & Package
AOZ1353LI-04 uses a 1.31mm × 1.81mm Wafer-Level Chip-Scale Package (WLCSP) with 12 solder bumps. The package is Pb-free, RoHS-compliant, and optimized for high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1A, 1B, 1C) | Power input supply node | Accepts 3.4–5.5V input; connects directly to upstream 5V rail or USB PD source; requires local 10µF+ ceramic decoupling. |
| VOUT (Pins 3A, 3B, 3C) | Switched output node | Delivers protected 5V to load (e.g., USB VBUS); rated to 28V absolute max; must withstand hot-plug transients. |
| GND (Pins 2B, 2C) | Power and signal reference | Low-impedance return path for switch current and control logic; requires solid ground plane connection per layout guidelines. |
| EN (Pin 3D) | Enable control input | Active-high logic interface (1.4V threshold); toggling resets latch-off faults - critical for system-level fault recovery. |
| FLTB (Pin 1D) | Open-drain fault indicator | Pulled low during OCP or thermal shutdown; requires external pull-up to 5V for host MCU monitoring; no reporting for UVLO/OVP/RCB. |
| ILIM (Pin 2D) | Current limit programming | Connects to GND via RLIM resistor; sets precise current limit using ILIM = 14300 / RLIM (Ω) equation. |
| SS (Pin 2A) | Soft-start timing control | Connects to GND for fixed 3.4ms ramp-up or to external CSS capacitor for adjustable turn-on (0.3–3.4ms) to limit inrush into large COUT. |
Key Features
| Feature | Design Value |
|---|---|
| Latch-off fault response | Prevents automatic re-engagement after OCP or thermal shutdown - eliminates uncontrolled cycling during persistent faults. |
| Fast shutdown SCP | Shuts off pass device within microseconds of short detection - minimizes VIN droop and avoids system brownout in USB PD applications. |
| True Reverse-Current Blocking (TRCB) | Blocks reverse flow from VOUT to VIN in both enabled and disabled states - essential for USB dual-role ports and power-sharing topologies. |
| Programmable current limit | Enables one BOM to support multiple load profiles (e.g., 0.5A accessory vs. 3.5A display) via simple RLIM resistor change. |
| Ultra-low quiescent current | 125µA operating / 6µA shutdown - extends battery runtime in always-connected portable devices without sacrificing protection integrity. |
Applications
| USB PD Power Source Switch | Smartphone/Tablet Power Management |
|---|---|
|
Use Scenario: Controls VBUS delivery in USB-C DRP (dual-role port) implementations where the device alternates between source and sink roles. IC Role / Device Role / Timing Role: Acts as a protected, bidirectionally isolated power switch with TRCB ensuring no backfeed during role swaps. Use Value: Eliminates need for external reverse-blocking diodes or complex sequencing, reducing BOM count and board area while meeting USB PD 3.1 compliance. |
Use Scenario: Enables/disables 5V power to high-capacitance modules (e.g., camera, display, USB peripheral) during sleep/wake transitions. IC Role / Device Role / Timing Role: Provides controlled soft-start and fast fault shutdown to prevent system reset during hot-plug events. Use Value: Limits inrush current to <1A during wake-up, avoiding voltage sag on shared PMIC rails and improving system stability. |
| Notebook/Ultrabook VBUS Switching | Portable Device Load Protection |
|
Use Scenario: Isolates USB-C port power during system suspend or firmware update to prevent unauthorized charging or data leakage. IC Role / Device Role / Timing Role: Functions as a secure, latch-off-enabled gate with FLTB signaling to EC/firmware for audit-ready fault logging. Use Value: Meets platform security requirements for port disablement while maintaining full OVP/OCP/thermal coverage during powered-down states. |
Use Scenario: Protects auxiliary 5V rails (e.g., SSD enclosure, docking station) against short circuits, overloads, and reverse polarity misconnections. IC Role / Device Role / Timing Role: Delivers 3.5A continuous switching with programmable current limit and 28V tolerance for ruggedized accessories. Use Value: Replaces discrete FET + protection IC solutions with a single WLCSP-12 component, cutting solution size by >60% and simplifying layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar protection switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AOZ1353LI-02 | Latch-off response with current-limit protection (not fast shutdown); identical pinout and package. | Lacks fast SCP comparator - slower reaction to hard shorts, resulting in larger VIN droop during fault. | Select AOZ1353LI-02 only when fast shutdown is not required and cost optimization is prioritized over transient immunity. |
| TCK107AG,LF | 3.0A, 5.5V-rated load switch with auto-restart OCP, 45mΩ RON, no TRCB or OVP; SOT-23-6 package. | Smaller current rating and missing TRCB/OVP makes it unsuitable for USB PD source applications but viable for basic 5V rail switching. | Choose TCK107AG,LF only for non-USB, low-risk 5V distribution where reverse blocking and over-voltage protection are unnecessary. |
Compared with AOZ1353LI-04, AOZ1353LI-02 offers identical latch-off behavior but lacks fast shutdown - increasing risk of system instability during short events. TCK107AG,LF provides lower-cost basic switching but omits critical protections (TRCB, OVP, programmable OCP) required for USB PD compliance and robust portable design.
Availability
AOZ1353LI-04 is available at Aetrix Electronics and suitable for USB PD power source switching, smartphone/tablet VBUS control, and notebook ultrabook load isolation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant WLCSP packaging.
Supply support for AOZ1353LI-04 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.
The AOZ1353LI family was designed specifically for USB Type-C and USB PD applications demanding integrated protection, ultra-small footprint, and reliable reverse-current blocking in space-constrained portable electronics.
FAQ
What fault conditions trigger the FLTB pin on the AOZ1353LI-04?
The FLTB pin on the AOZ1353LI-04 is an open-drain fault indicator that pulls low only during over-current protection (OCP) or thermal shutdown events - with a 12ms delay after OCP activation. It does not assert for under-voltage lockout (UVLO), over-voltage protection (OVP), or true reverse-current blocking (TRCB) events. A pull-up resistor to 5V is required for proper logic-level signaling to the host controller.
How does the AOZ1353LI-04 differ from AOZ1353LI-01 in fault recovery behavior?
The AOZ1353LI-04 implements latch-off fault recovery, meaning it remains disabled after OCP or thermal shutdown until the EN pin is toggled or VIN is recycled. In contrast, AOZ1353LI-01 uses auto-restart and attempts recovery 24ms after fault removal. This makes AOZ1353LI-04 more suitable for safety-critical or firmware-controlled systems where unattended re-engagement is undesirable.
Can the AOZ1353LI-04 be used in USB Type-C dual-role port (DRP) applications?
Yes, the AOZ1353LI-04 is explicitly designed for USB Type-C DRP applications due to its True Reverse-Current Blocking (TRCB) feature, which prevents backfeed from VOUT to VIN in both enabled and disabled states. Its 28V VOUT rating, fast TRCB recovery (<100µs), and latch-off behavior ensure safe, controlled power handover during role swaps without external diodes or sequencing logic.
What is the recommended value for the RLIM resistor to achieve a 2.0A current limit on the AOZ1353LI-04?
To achieve a 2.0A current limit on the AOZ1353LI-04, use an RLIM resistor of 7.15kΩ, calculated using the formula ILIM = 14300 / RLIM (Ω). A 1% tolerance metal-film resistor is recommended for accuracy. At this setting, the device delivers consistent 2.0A limiting across temperature (±0.1A variation from –40°C to +85°C per datasheet Figure 24).
Does the AOZ1353LI-04 require an external capacitor on the SS pin for basic operation?
No, the AOZ1353LI-04 does not require an external capacitor on the SS pin for basic operation - shorting SS to GND enables a fixed 3.4ms soft-start time, sufficient for most USB PD and portable applications. An external CSS capacitor (1–12nF) is optional and used only when faster (0.3ms) or slower (up to 3.4ms) ramp-up times are needed to match specific load capacitance or inrush constraints.
AOZ1353LI-04 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 12-UFBGA, WLCSP
- 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):
- 32mOhm
- Input Type:
- Non-Inverting
- Features:
- Latch Function, Status Flag
- 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-WLCSP (1.81x1.31)
AOZ1353LI-04 FAQ
1.How can I place an order for AOZ1353LI-04 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ1353LI-04 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 AOZ1353LI-04 reliable?
The price and inventory of AOZ1353LI-04 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ1353LI-04 is usually 5 days.
3.What payment methods are accepted for AOZ1353LI-04?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ1353LI-04 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ1353LI-04?
AOZ1353LI-04 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ1353LI-04 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 AOZ1353LI-04?
For technical support, including AOZ1353LI-04 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ1353LI-04 requirements.
6.How does Aetrix verify that AOZ1353LI-04 is sourced from the original manufacturer or authorized distributors?
All AOZ1353LI-04 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 AOZ1353LI-04 meets industry standards.
7.What is the process for return or replacement of AOZ1353LI-04?
All AOZ1353LI-04 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ1353LI-04, 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 AOZ1353LI-04 part is unused and in its original packaging.
Return procedure for AOZ1353LI-04:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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