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Alpha & Omega Semiconductor Inc. AOZ1351DI-01
- Part No.:
- AOZ1351DI-01
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
AOZ1351DI-01.pdf
- Description:
- ECPOWERTM 5V 38M PROTECTION SWIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,153
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Product details
Overview
AOZ1351DI-01 from Alpha and Omega Semiconductor is a 28V-rated, 38mΩ RON current-limiting protection switch with True Reverse Current Blocking (TRCB), programmable over-current threshold (0.88–4.48A), 1µs TRCB recovery, and integrated UVLO/OVLO/OTP/SCP protections. It operates from 3.4V–5.5V input and targets USB PD power path control in portable computing and mobile devices.
For engineers reviewing the AOZ1351DI-01 datasheet, pinout, applications, or equivalent options, key selection criteria include its 12-pin DFN3x3 package, auto-restart fault recovery, 6µA shutdown current, TRCB trip/release thresholds (10–40mV / –15–35mV), and compatibility with Type-C VBUS switching architectures requiring reverse-current immunity.
Technical Context
The AOZ1351DI-01 integrates a low-RON N-channel MOSFET power switch with charge-pump gate drive, analog current-sense circuitry referenced to ILIM, and independent comparators for UVLO (3.25V threshold), OVLO (5.8V threshold), and TRCB (25mV trip). Its control logic implements fixed 2ms soft-start and foldback current limiting (8% reduction on OCP detection).
TRCB operation is hardware-based: when VOUT–VVIN exceeds VT_TRCB (typ. 25mV), the switch turns off within 600ns; recovery begins when VOUT–VVIN falls below VR_TRCB (typ. 10mV), completing in 1µs after a 1.3ms setup window post-enable. Fault reporting is limited to open-drain FLTB asserted low on OCP or OTP events only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Rating | 28V absolute max - supports USB PD 5V/9V/15V/20V output rails without external clamping |
| RON | 38mΩ typ. at 1A - enables <190mW conduction loss at 2.3A continuous load |
| Current Limit Range | 0.88–4.48A via RLIM resistor - supports scalable protection across 1A–4A USB PD sink applications |
| TRCB Recovery Time | 1µs - restores power path faster than typical USB PD re-negotiation cycles |
| Shutdown Current | 6µA - minimizes battery drain in always-on system standby states |
| UVLO Threshold | 3.25V (rising) with 250mV hysteresis - prevents erratic switching during brown-out conditions |
| OVLO Threshold | 5.8V (rising) with 280mV hysteresis - guards against transient overvoltage on adapter inputs |
| Operating Temp | –40°C to +85°C ambient - validated for smartphone/tablet internal thermal environments |
Pinout & Package
AOZ1351DI-01 uses a RoHS-compliant 3mm × 3mm DFN3x3-12L package with exposed thermal pad (EXP) soldered to PCB ground for thermal management. Pin 1–3 and 10–12 are internally bonded VOUT/VIN pairs respectively; Pin 6 is NC; EXP must be connected to GND via multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | VOUT | Power output node - connects directly to USB Type-C VBUS; rated 28V max, handles full load current |
| 4 | FLTB | Open-drain fault indicator - pulled low only on OCP or OTP; requires external 5V pull-up (RFLTB) |
| 5 | CP | Charge pump reservoir - connects to 47nF capacitor; enables stable gate drive for low RON |
| 6 | NC | No connect - must remain unconnected per datasheet |
| 7 | GND | Power and signal reference - ties to EXP thermal pad and system ground plane |
| 8 | ILIM | Current limit set input - connects to 1% RLIM resistor to GND; sets OCP threshold |
| 9 | EN | Enable control - active-high with 1.4V logic high threshold; internal 1.8MΩ pulldown |
| 10, 11, 12 | VIN | Power input node - connects to adapter or PD controller output; rated 5.5V max |
Key Features
| Feature | Design Value |
|---|---|
| True Reverse Current Blocking (TRCB) | Hardware-enforced blocking with 25mV trip and 10mV release thresholds - eliminates need for external back-to-back MOSFETs in USB PD designs |
| Programmable Over-Current Protection | Resistor-set threshold (0.88–4.48A) with 8% foldback - maintains safe power delivery under sustained overload without latch-off |
| Integrated Input Protections | UVLO (3.25V), OVLO (5.8V), and SCP (390mV VIN–VOUT detection) - reduces external component count for robust adapter interface |
| Auto-Restart Fault Recovery | Self-resumes after OVLO or OTP faults clear - avoids manual reset in portable systems with intermittent input issues |
| Low Quiescent Power | 220µA operating / 6µA shutdown current - extends battery life in always-connected USB-C accessories |
| ESD & Surge Robustness | ±2kV HBM, ±1kV CDM, IEC 61000-4-2 8kV on VOUT - withstands handling and connector hot-plug transients |
Applications
| USB PD Power Source Switch | Smartphones and Tablets |
|---|---|
Use Scenario: Controls VBUS power path between USB-C port and PD controller in host-mode devices. IC Role / Device Role / Timing Role: High-side protection switch enabling/disabling 5V–20V power delivery with reverse-current immunity. Use Value: Eliminates need for discrete back-to-back MOSFETs while providing 1µs TRCB recovery to maintain PD negotiation timing. |
Use Scenario: Manages battery-charging input path and accessory power delivery in compact mobile platforms. IC Role / Device Role / Timing Role: Load switch isolating PMIC outputs from USB-C port with thermal and overvoltage fault response. Use Value: 38mΩ RON limits voltage drop to <92mV at 2.3A, preserving system efficiency in space-constrained layouts. |
| Notebooks and Ultrabooks | Portable Devices |
Use Scenario: Provides primary VBUS switching in thin-and-light laptops supporting USB-C charging and data. IC Role / Device Role / Timing Role: Protected power rail switch with auto-restart behavior for resilient adapter hot-plug operation. Use Value: 2ms soft-start prevents inrush-induced voltage sag on shared 5V rails during plug-in events. |
Use Scenario: Enables compact, efficient power routing in portable SSDs, docks, and multi-port hubs. IC Role / Device Role / Timing Role: Current-limited enable switch for auxiliary power domains with fault flag reporting to MCU. Use Value: FLTB pin provides direct OCP/OTP status to host processor without additional sensing circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limiting protection switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TUSB546IRKTR | USB 3.1 Gen 2 redriver with integrated 5V switch; no programmable OCP or TRCB; 100mΩ RON | Targeted at signal integrity enhancement, not primary power path protection | Select AOZ1351DI-01 when discrete, high-efficiency VBUS switching with reverse-current blocking is required. |
| TPS25750RWER | USB PD 3.1 controller with integrated 28V 4.5A switch; supports PD communication; 45mΩ RON; no TRCB | Full PD controller solution requiring firmware integration; higher BOM cost and complexity | Choose AOZ1351DI-01 for standalone, low-cost, firmware-free VBUS protection where PD negotiation is handled externally. |
Compared with TUSB546IRKTR and TPS25750RWER, AOZ1351DI-01 delivers superior power efficiency (38mΩ vs ≥45mΩ), hardware TRCB immunity, and simpler implementation for non-PD-controller-based USB-C power switches - making it optimal for cost-sensitive, space-constrained portable designs needing robust reverse-current blocking.
Availability
AOZ1351DI-01 is available at Aetrix Electronics and suitable for USB PD power source switching, smartphone/tablet VBUS management, and notebook ultrabook charging circuits requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for AOZ1351DI-01 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 AOZ1351DI-01 belongs to AOS's ECPower™ family of protected load switches, designed specifically for USB Type-C power delivery architectures requiring low RON, reverse-current blocking, and comprehensive fault protection without microcontroller dependency.
FAQ
What is the maximum continuous output current supported by AOZ1351DI-01?
The AOZ1351DI-01 does not specify a fixed maximum continuous current rating; instead, its current limit threshold is programmable via an external resistor (RLIM) from 0.88A to 4.48A. At 4.48A with 38mΩ RON, power dissipation reaches ~750mW - requiring adequate PCB copper area and thermal vias to maintain junction temperature below 150°C. Derating is necessary above +60°C ambient.
How does AOZ1351DI-01 implement True Reverse Current Blocking (TRCB)?
AOZ1351DI-01 implements TRCB using an internal comparator that monitors VOUT–VVIN. When this difference exceeds 25mV (VT_TRCB), the power switch turns off within 600ns. Once VOUT–VVIN falls below 10mV (VR_TRCB), the switch recovers in 1µs - but only after a 1.3ms setup window post-enable. This hardware-based mechanism operates independently of EN state.
Can AOZ1351DI-01 be used in 9V or 15V USB PD applications?
Yes - AOZ1351DI-01 supports VOUT up to 28V absolute maximum and operates with input voltages from 3.4V to 5.5V. For 9V/15V PD applications, it functions as a downstream-facing port (DFP) VBUS switch where VIN is supplied by a local 5V rail (e.g., from a buck converter), and VOUT connects to the USB-C connector. Its 28V VOUT rating ensures safe operation during PD voltage transitions.
What is the purpose of the CP pin on AOZ1351DI-01?
The CP pin on AOZ1351DI-01 serves as the charge pump reservoir node. It must be connected to a 47nF capacitor (minimum) to GND to provide stable gate drive voltage for the internal N-channel MOSFET. This enables the low 38mΩ RON and ensures reliable turn-on/turn-off behavior across temperature and input voltage ranges - no external load is permitted on CP.
Does AOZ1351DI-01 report UVLO or OVLO faults on the FLTB pin?
No - AOZ1351DI-01 asserts the FLTB pin low only during over-current protection (OCP) or over-temperature protection (OTP) events. UVLO, OVLO, and TRCB conditions do not trigger FLTB. The device auto-restarts after OVLO or OTP faults clear, but no active fault signal is provided for those events - system-level monitoring must rely on upstream controller status or voltage sensing.
AOZ1351DI-01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 12-VFDFN Exposed Pad
- Series:
- -
- 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):
- 38mOhm
- Input Type:
- Non-Inverting
- Features:
- 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-DFN (3x3)
AOZ1351DI-01 FAQ
1.How can I place an order for AOZ1351DI-01 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ1351DI-01 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 AOZ1351DI-01 reliable?
The price and inventory of AOZ1351DI-01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ1351DI-01 is usually 5 days.
3.What payment methods are accepted for AOZ1351DI-01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ1351DI-01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ1351DI-01?
AOZ1351DI-01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ1351DI-01 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 AOZ1351DI-01?
For technical support, including AOZ1351DI-01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ1351DI-01 requirements.
6.How does Aetrix verify that AOZ1351DI-01 is sourced from the original manufacturer or authorized distributors?
All AOZ1351DI-01 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 AOZ1351DI-01 meets industry standards.
7.What is the process for return or replacement of AOZ1351DI-01?
All AOZ1351DI-01 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ1351DI-01, 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 AOZ1351DI-01 part is unused and in its original packaging.
Return procedure for AOZ1351DI-01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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