PI3USB9281CXWEX - USB Port Protection & Charger Detect | Diodes Inc.
MPN: PI3USB9281CXWEX ✓ Hoạt độngPI3USB9281CXWEX Tóm tắt
A USB port protection IC belongs to the power management IC family and sits between the USB connector and the system power path. Its role is to detect what type of device or charger is attached to the USB port, configure the charging current accordingly, and protect the upstream power rail from fault conditions such as over-voltage, over-current, and short circuits. In the system hierarchy, it functions as a specialized power management IC combining analog detection circuitry with a protected power switch.
Key features include charger detection for the wide variety of chargers on the market, MHL accessory and OTG accessory detection, car-charger detection per the CEA936 specification, and an integrated power switch with over-voltage and over-current protection. The VBUSIN pin tolerates voltages up to 28V, which is critical for systems supporting the USB 3.0 PowerDelivery specification where VBUS can reach 20V.
The PI3USB9281C family operates over a temperature range up to +85C, using an integrated detection state machine that enumerates the attached accessory type and reports it to the system controller, allowing the host to negotiate appropriate charging profiles without user intervention.
Typical applications include smartphones, tablets, digital cameras, and notebooks with integrated Li-ion batteries that charge via USB connectors - exactly the portable and consumer applications cited in the manufacturer datasheet.
When designing with this device, place the protection switch close to the USB connector and ensure the PCB can handle the configured charge current; verify fault-response behavior against the manufacturer datasheet for your specific VBUS transients.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PI3USB9281CXWEX — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
PI3USB9281AXWEX
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PI3USB9281CXWEX Tỷ lệ tối đa & tính chất điện
| Chức năng | USB 2.0 Port Detection with Port Protection |
| Charger Detection | Yes - various market chargers, MHL, OTG, car chargers per CEA936 |
| Integrated Power Switch | Yes, with over-voltage and over-current protection |
| VBUSIN Pin Tolerance | Up to 28 V |
| USB-PD Compatibility | Supports USB 3.0 PowerDelivery environments (VBUS to 20 V) |
| Khoảng nhiệt độ hoạt động | Up to +85 C |
| Hộp | 20-UQFN (3x4 mm) Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
Hướng dẫn cấu hình chân PI3USB9281CXWEX 20-uqfn (3x4 mm) exposed pad
Cấu hình chân cho PI3USB9281CXWEX (20-uqfn (3x4 mm) exposed pad gói). Động cơ điện này có chân cổng, nguồn và đầu ra. Đối với các gói không phân極, tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết hướng dẫn chính xác của chân 1 và chi tiết về vân footprint. Các ứng dụng phổ biến bao gồm thiết kế nguồn cung cấp điện, điều khiển động cơ và chuyển đổi tải.
Không có dữ liệu chân cụ thể sẵn có cho PI3USB9281CXWEX.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
PI3USB9281CXWEX phù hợp cho 6 Áp dụngs: Smartphone USB Charging Port, Tablet USB Charging and Accessory Detection, Notebook / Ultrabook USB Charging Port, Digital Camera USB Port, Power Bank and Portable Charger Input, In-Vehicle USB Charging Module.
Smartphone USB Charging Port
Smartphones rely on the micro-USB or USB-C connector both for data and for charging the integrated Li-ion battery, making the port the single most fault-exposed interface on the device. The PI3USB9281CXWEX fits this role because it detects every common charger type available in the market, including MHL accessories, OTG accessories, and car chargers per the CEA936 specification, allowing the phone to configure the correct charge current automatically. Its integrated power switch adds over-voltage and over-current protection directly at the port, and the 28V-tolerant VBUSIN pin provides the headroom needed for USB 3.0 PowerDelivery environments where VBUS reaches 20V. Placed between the connector and the charge path with datasheet-recommended capacitance, it prevents fault voltage from reaching the battery charger IC while reporting accessory type to the application processor.
Được đề xuất
Tablet USB Charging and Accessory Detection
Tablets draw higher charge currents than phones and are frequently connected to third-party chargers, car chargers, and OTG accessories, so accurate charger detection directly determines charging speed and safety. The PI3USB9281CXWEX addresses this by enumerating the attached accessory type - market chargers, MHL, OTG, and CEA936 car chargers - and reporting it to the system controller so the correct charging profile is selected. The integrated power switch with over-voltage and over-current protection guards the Li-ion charge input against damaged or counterfeit chargers, and the 28V VBUSIN tolerance keeps the port protected even if a USB 3.0 PowerDelivery source negotiates up to 20V. Operating up to +85C ambient covers typical tablet thermal environments, and the compact 20-UQFN (3x4 mm) footprint suits densely packed main boards.
Được đề xuất
Notebook / Ultrabook USB Charging Port
Notebooks with integrated Li-ion batteries that charge via USB connectors - the exact use case cited in the manufacturer datasheet - need robust port front-ends because the notebook may act as both host and charging sink. The PI3USB9281CXWEX provides the detection state machine for market chargers, MHL and OTG accessories, and CEA936 car chargers, while its integrated power switch with over-voltage and over-current protection isolates faults at the connector. The 28V-tolerant VBUSIN input is particularly valuable here because notebooks increasingly participate in USB 3.0 PowerDelivery ecosystems where VBUS can reach 20V. Operating up to +85C and packaged in a 20-UQFN (3x4 mm) exposed-pad package, it integrates into the notebook's power-distribution area near the connector with minimal board space and supports the port-detection signaling expected by the embedded controller.
Được đề xuất
Digital Camera USB Port
Digital cameras charge their Li-ion batteries via USB and simultaneously support OTG accessories for media transfer, making charger and accessory detection a core requirement of the camera's port circuitry. The PI3USB9281CXWEX detects the chargers and accessories attached to the port - including MHL accessories for TV output and CEA936 car chargers for in-vehicle charging - and its integrated power switch provides over-voltage and over-current protection against damaged cables and chargers. The 28V VBUSIN tolerance protects the camera's charge input if a USB 3.0 PowerDelivery source is connected, and operation up to +85C covers typical consumer usage. The small 20-UQFN (3x4 mm) package fits the compact camera main board, placed between the USB connector and the charge-management circuit per the datasheet application schematic.
Được đề xuất
Power Bank and Portable Charger Input
Power banks accept charge from arbitrary USB sources - wall chargers, car chargers, and PC ports - so the input stage must identify the source and protect the internal Li-ion cells and boost-charge circuitry. The PI3USB9281CXWEX performs this detection across the full range of market charger types, including OTG detection for the discharge path and CEA936 car-charger detection, while the integrated power switch with over-voltage and over-current protection blocks fault voltages before they reach the charging IC. The 28V-tolerant VBUSIN pin gives the margin required for USB 3.0 PowerDelivery sources operating at up to 20V, an increasingly common input on modern power banks. In the 20-UQFN (3x4 mm) exposed-pad package with operation to +85C, it sits directly at the USB input connector with minimal board area impact.
Được đề xuất
In-Vehicle USB Charging Module
Automotive and aftermarket USB charging modules face harsh input conditions: long inductive cables, load dump on the vehicle rail, and a wide variety of consumer devices expecting specific charging signatures. The PI3USB9281CXWEX supports car-charger detection per the CEA936 specification, so attached phones and tablets recognize the port as a dedicated charging source and draw maximum allowed current. Its integrated power switch with over-voltage and over-current protection, combined with a VBUSIN tolerance of up to 28V for USB 3.0 PowerDelivery environments, protects downstream circuitry from vehicle transients and from PowerDelivery-capable devices negotiating up to 20V. Operation up to +85C and the compact 20-UQFN (3x4 mm) exposed-pad package suit enclosed charging-module designs, where the IC is placed at the USB receptacle output ahead of the charging converter.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PI3USB9281CXWEX — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PI3USB9281AXWEX | PI3USB9281CGEEX |
|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated |
| Charger Detection | Market chargers, MHL, OTG, car chargers per CEA936 | Charger detection per A-version datasheet | Same as PI3USB9281CXWEX |
| Integrated Power Switch with OVP/OCP | Yes | Yes | Yes |
| Drop-In Footprint Compatible | Reference | Yes - same 20-UQFN footprint | No - different package suffix |
Bảo phân biệt quan trọng
- 28V-tolerant VBUSIN for USB PowerDelivery (vsPI3USB9281AXWEX)
- Fully integrated protection switch (vsPI3USB9281CGEEX)
- Comprehensive accessory detection (vsPI3USB9281AXWEX)
Ghi chú thiết kế
Place the PI3USB9281CXWEX as close to the USB connector as possible so the integrated power switch interrupts the VBUS path before any downstream circuitry. The exposed pad of the 20-UQFN (3x4 mm) package should be soldered to a ground pour with an adequate via array - it serves as the primary thermal and ground return path. Keep the VBUSIN trace wide enough for the maximum configured charge current and follow the manufacturer datasheet's recommended external capacitor values on VBUS IN and VBUS OUT.
Do not assume the A-version (PI3USB9281AXWEX) carries the same 28V VBUSIN tolerance as the C-version. The 28V rating exists specifically to survive USB 3.0 PowerDelivery environments where VBUS reaches 20V; substituting the A-version in a PowerDelivery design without verifying its rating risks over-voltage damage to the protection switch. Additionally, detection of MHL and CEA936 car chargers depends on correct ID-pin resistor networks - copy these directly from the datasheet application circuit.
Estimated: the on-chip power switch dissipates I^2 x Rds(on) during charging; because the switch on-resistance value is not present in the verified data, compute dissipation from the datasheet Rds(on) at your specific charge current before finalizing the thermal design. For a 2A charge current the copper pour under the exposed pad must keep the junction within the rated operating range up to +85C ambient. Verify OCP threshold settings so legitimate high-current chargers are not falsely tripped.
Thông tin tuân thủ
Compliance data was not present in the verified web data. The 'EX' suffix in Diodes Incorporated part numbering conventionally indicates lead-free/RoHS packaging, but this must be confirmed on the manufacturer product page before being treated as verified.
