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Alpha & Omega Semiconductor Inc. AOZ1353LI-03
- Part No.:
- AOZ1353LI-03
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package:
- 12-UFBGA, WLCSP
- Datasheet:
-
AOZ1353LI-03.pdf
- Description:
- 5V/3A USB LOAD SWITCH WITH AUTO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AOZ1353LI-03 from Alpha and Omega Semiconductor is a 5V/3A ECPower™ protection switch with True Reverse-Current Blocking (TRCB), fast short-circuit protection (SCP), and auto-restart fault recovery. It operates from 3.4V to 5.5V input, delivers up to 3.5A continuous current, features 32mΩ typical RON, and integrates UVLO, OVP, thermal shutdown, and programmable current limiting via external resistor RLIM. It serves as a robust USB PD power source switch in portable computing and mobile devices.
For engineers reviewing the AOZ1353LI-03 datasheet, pinout, applications, or equivalent options, key selection criteria include its fast SCP response (immediate shutdown + 3ms soft-start restart), TRCB trip point of 20mV, 125µA quiescent current, WLCSP-12 package footprint (1.31mm × 1.81mm), and compatibility with USB Type-C VBUS switching requirements.
Technical Context
The AOZ1353LI-03 implements a fast-response SCP comparator that shuts down the pass device immediately upon hard short detection-minimizing VIN droop-and auto-restarts after 3ms soft-start. Its TRCB circuit blocks reverse current at 20mV VOUT–VIN threshold and recovers in <100µs once condition clears.
It uses an external resistor (RLIM) to set current limit per ILIM = 14300 / RLIM (A), supports adjustable soft-start via CSS capacitor (0.3ms–3.4ms), and reports over-current and thermal faults on open-drain FLTB with 12ms delay to flag assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 5.5V - supports full USB PD 5V rail operation with margin for ripple and drop. |
| Continuous Current Rating | 3.5A - sustains high-capacity charging and bus powering without derating at TA ≤ 85°C. |
| RON (Typ.) | 32mΩ - limits conduction loss to ≤560mW at 3.5A, enabling efficient thermal design in compact WLCSP. |
| VOUT Rating | 28V absolute max - withstands transient surges and accidental 12V/20V misconnections during reverse-current events. |
| Quiescent Current | 125µA - enables low-power standby in always-on USB-C port controllers without battery drain. |
| SCP Response | Immediate shutdown + 3ms auto-restart - prevents system brownout during short events while maintaining port availability. |
| TRCB Threshold | 20mV VOUT–VIN - blocks leakage before parasitic diode conduction begins, critical for dual-role USB-C ports. |
Pinout & Package
AOZ1353LI-03 is housed in a 1.31mm × 1.81mm Wafer-Level Chip-Scale Package (WLCSP) with 12 solder bumps. The package is RoHS-compliant, Pb-free, and optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1A, 1B, 1C) | Main power input | Accepts 3.4–5.5V supply; connects directly to upstream USB-C CC-controlled source rail. |
| VOUT (Pins 3A, 3B, 3C) | Switched output | Drives VBUS in USB PD applications; rated to 28V for surge tolerance and reverse-blocking integrity. |
| GND (Pins 2B, 2C) | Power ground reference | Low-impedance return path for switch current and internal protection circuits; must be solidly connected to thermal pad. |
| EN (Pin 3D) | Enable control input | Active-high logic interface (1.4V threshold); toggling resets fault latch only in latch-off variants-not applicable to AOZ1353LI-03. |
| FLTB (Pin 1D) | Fault indicator output | Open-drain signal pulled low after 12ms during over-current or thermal events; requires external pull-up for host MCU monitoring. |
| ILIM (Pin 2D) | Current limit programming | Connects to GND via RLIM resistor to set precise trip threshold (e.g., 14.3kΩ = 1A). |
| SS (Pin 2A) | Soft-start timing control | Capacitor-to-GND sets turn-on time (0.3–3.4ms); shorting to GND fixes 3.4ms default for predictable inrush control. |
Key Features
| Feature | Design Value |
|---|---|
| Fast Short-Circuit Protection | Immediate pass-device shutdown on hard short, followed by 3ms soft-start retry-prevents system voltage collapse in USB-C sink scenarios. |
| True Reverse-Current Blocking | Active blocking at 20mV differential eliminates backfeed from VBUS to source during dead-battery or dual-role port transitions. |
| Programmable Current Limit | External RLIM resistor sets precise trip point (0.45–3.92A range) without trimming or calibration-supports flexible BOM across product SKUs. |
| Ultra-Low Quiescent Current | 125µA operating / 6µA shutdown current extends battery life in always-connected portable devices with multiple USB-C ports. |
| Integrated Over-Voltage Protection | 5.5–6.0V OVP threshold with 250mV hysteresis and 2µs response ensures robustness against 5V rail overshoot during hot-plug or adapter transients. |
Applications
| USB PD Power Source Switch | Smartphone & Tablet Charging Port |
|---|---|
Use Scenario: Managing VBUS enable/disable and fault protection in USB-C DRP (dual-role port) implementations where the device acts as power source. IC Role / Device Role / Timing Role: High-side protection switch with TRCB, fast SCP, and auto-restart-ensures safe negotiation and delivery of 5V/3A power without host MCU intervention. Use Value: Eliminates need for discrete OVP/OC/thermal ICs and external reverse-blocking MOSFETs, reducing BOM count and PCB area by >40%. | Use Scenario: Enabling/disabling charging path between USB-C port and battery management system during cable insertion/removal. IC Role / Device Role / Timing Role: Fault-tolerant power gate with 125µA IQ and 32mΩ RON-maintains low standby drain while delivering full 3.5A charging current with minimal voltage drop. Use Value: Enables rapid port detection and power delivery within 3.4ms soft-start window, meeting USB PD 3.0 timing requirements for source capability advertisement. |
| Notebook/Ultrabook USB-C Hub | Portable Monitor Power Delivery |
Use Scenario: Isolating downstream USB-C peripherals from upstream host during over-current or thermal events in multi-port docking stations. IC Role / Device Role / Timing Role: Auto-restarting protection switch with FLTB reporting-provides transparent fault recovery without requiring OS-level driver handling. Use Value: Prevents hub-wide reset on single-port overload; maintains connectivity for other active ports during SCP event recovery cycles. | Use Scenario: Controlling power delivery to external display over USB-C while protecting against accidental 20V reverse feed from DisplayPort Alt Mode sources. IC Role / Device Role / Timing Role: 28V-rated VOUT switch with TRCB and fast recovery-blocks reverse current from DP Alt Mode VBUS lines while enabling seamless source-sink role swaps. Use Value: Avoids damage to monitor's internal DC-DC converters during hot-plug into powered laptops, satisfying IEC 62368-1 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side protection switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCK127G | Higher RON (45mΩ), no TRCB, fixed 2.5A current limit, SOT-23-6 package | Lacks reverse-current blocking and programmable OCP; suitable only for unidirectional, non-USB-C applications | Select when cost sensitivity outweighs TRCB requirement and board space allows larger SOT-23 footprint. |
| TPS22975 | Lower IQ (10µA), but no OVP or TRCB; 5.5V max VIN, 1.2A rating, 1.6mm × 1.6mm DSBGA | Insufficient for 3.5A USB PD; lacks 28V VOUT rating and fast SCP-requires external OVP/RCB circuitry | Choose only for low-current, non-USB-C auxiliary rails where ultra-low IQ is primary constraint. |
Compared with TCK127G and TPS22975, AOZ1353LI-03 uniquely combines 3.5A capability, 28V VOUT rating, True Reverse-Current Blocking, and fast auto-restart SCP in a 1.31mm × 1.81mm WLCSP-making it the only single-chip solution qualified for USB PD 3.0-compliant source switching without supplemental protection components.
Availability
AOZ1353LI-03 is available at Aetrix Electronics and suitable for USB PD power source switching, smartphone/tablet charging port management, and notebook USB-C hub applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AOZ1353LI-03 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 and Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, power ICs, and protection solutions for consumer, computing, and industrial markets.
The AOZ1353LI product line delivers integrated ECPower™ protection switches targeting USB-C and USB PD systems, with design emphasis on minimizing external components, enabling compact form factors, and ensuring robust fault resilience in portable electronics.
FAQ
What is the short-circuit protection behavior of AOZ1353LI-03?
The AOZ1353LI-03 implements fast short-circuit protection: upon detecting a hard short, it immediately shuts down the pass device to minimize VIN droop, then auto-restarts after a fixed 3ms soft-start interval. If the short persists, it enters current-limit mode until disabled or thermal shutdown occurs. This behavior is specific to the -03 and -04 variants and differs from the -01/-02 versions.
Does AOZ1353LI-03 support True Reverse-Current Blocking in both enabled and disabled states?
Yes, AOZ1353LI-03 provides True Reverse-Current Blocking (TRCB) regardless of EN state. When VOUT exceeds VIN by 20mV, the switch turns off to block reverse flow; recovery occurs within <100µs once VOUT falls below VIN by 40mV. This function operates independently of enable status, making AOZ1353LI-03 suitable for bidirectional USB-C ports.
How is the current limit threshold set for AOZ1353LI-03?
The current limit threshold for AOZ1353LI-03 is set using an external resistor RLIM connected between the ILIM pin and GND. The relationship is ILIM (A) = 14300 / RLIM (Ω). For example, a 14.3kΩ resistor yields ~1A limit. The datasheet specifies tolerances and recommends 1% metal-film resistors for accuracy. AOZ1353LI-03 does not support internal or digital current limit adjustment.
What package type and dimensions does AOZ1353LI-03 use?
AOZ1353LI-03 uses a Wafer-Level Chip-Scale Package (WLCSP) with 12 solder bumps, measuring 1.31mm × 1.81mm. The package has a 0.4mm pitch and includes exposed die attach for thermal performance. It is RoHS-compliant and Pb-free, with part marking code "G" per the manufacturer's ordering table.
Can AOZ1353LI-03 be used in USB Type-C applications requiring VBUS switching?
Yes, AOZ1353LI-03 is explicitly designed for USB Type-C VBUS switching. Its 28V VOUT rating handles transient surges, True Reverse-Current Blocking prevents backfeed during role swaps, and fast SCP protects against cable shorts. The device meets UL2367 and IEC62368 safety certifications, and its 3.4–5.5V input range aligns with USB PD 5V profiles.
AOZ1353LI-03 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:
- Auto Restart, 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-03 FAQ
1.How can I place an order for AOZ1353LI-03 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ1353LI-03 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-03 reliable?
The price and inventory of AOZ1353LI-03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ1353LI-03 is usually 5 days.
3.What payment methods are accepted for AOZ1353LI-03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ1353LI-03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ1353LI-03?
AOZ1353LI-03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ1353LI-03 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-03?
For technical support, including AOZ1353LI-03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ1353LI-03 requirements.
6.How does Aetrix verify that AOZ1353LI-03 is sourced from the original manufacturer or authorized distributors?
All AOZ1353LI-03 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-03 meets industry standards.
7.What is the process for return or replacement of AOZ1353LI-03?
All AOZ1353LI-03 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ1353LI-03, 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-03 part is unused and in its original packaging.
Return procedure for AOZ1353LI-03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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