Overview
The SI3402-B-GM is a highly-integrated, IEEE 802.3at Type 1-compliant Power over Ethernet (PoE) Powered Device (PD) interface and pulse-width-modulated (PWM) switching regulator. Developed by Skyworks Solutions Inc., this component is designed to convert the high voltage (typically ±48 V) supplied over Ethernet copper UTP cabling into a regulated, low-voltage DC supply. It is particularly useful in PoE-enabled systems such as wireless access points, VoIP phones, and other Ethernet devices, offering high efficiency, reliability, and a minimal Bill of Materials (BOM) cost.
Key Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Manufacturer Type | Powered Device - PD | Standard | 802.3af |
| Coil Current | 680 mA | On Resistance - Max | 1.3 Ohms |
| Collector-Emitter Saturation Voltage | 2.8 V to 57 V | Minimum Operating Temperature (°C) | -40 |
| Maximum Operating Temperature (°C) | +85 | Mounting Style | SMD/SMT |
| Duty Cycle - Max | 75 % | Moisture Sensitive | Yes |
| Number of Channels | 1 Channel | Current @ Pmpp | 3.1 mA |
| Series | Si3402 | Factory Pack Quantity | 490 |
| Unit Weight | 0.004339 oz | Package/Case | 20-VQFN Exposed Pad |
Key Features
- IEEE 802.3 standard-compliant solution, including pre-standard (legacy) PoE support
- Highly-integrated IC enabling compact solution footprints with minimal external components
- Integrated diode bridges and transient surge suppressor
- Integrated switching regulator controller with on-chip power FET
- Integrated dual current-limited hotswap switch
- Programmable classification circuit
- Incorporates switcher EMI-reduction techniques
- Supports non-isolated and isolated switching topologies
- Comprehensive protection circuitry including transient overvoltage protection, undervoltage lockout, early power-loss indicator, thermal shutdown protection, and foldback current limiting
- Low-profile 5 x 5 mm 20-pin QFN package
- RoHS-compliant and free from SVHC (Substances of Very High Concern)
Applications
The SI3402-B-GM is commonly used in various PoE-enabled systems, including:
- Wireless access points
- VoIP phones
- IP cameras
- Network switches and routers
- Other Ethernet devices requiring efficient power delivery and management
Q & A
- What is the primary function of the SI3402-B-GM?
The SI3402-B-GM is a Power over Ethernet (PoE) Powered Device (PD) interface and PWM switching regulator, converting high voltage from Ethernet cabling into a regulated low-voltage DC supply.
- Which IEEE standard does the SI3402-B-GM comply with?
The SI3402-B-GM is compliant with the IEEE 802.3at Type 1 standard.
- What are the key integrated components of the SI3402-B-GM?
The SI3402-B-GM integrates diode bridges, transient surge suppressor, switching regulator controller with on-chip power FET, and dual current-limited hotswap switch.
- What is the operating temperature range of the SI3402-B-GM?
The operating temperature range is from -40°C to +85°C.
- What types of switching topologies does the SI3402-B-GM support?
The SI3402-B-GM supports both non-isolated and isolated switching topologies.
- What kind of protection circuitry is included in the SI3402-B-GM?
The SI3402-B-GM includes comprehensive protection circuitry such as transient overvoltage protection, undervoltage lockout, early power-loss indicator, thermal shutdown protection, and foldback current limiting.
- Is the SI3402-B-GM RoHS-compliant?
Yes, the SI3402-B-GM is RoHS-compliant and free from SVHC.
- What is the package type and size of the SI3402-B-GM?
The SI3402-B-GM is packaged in a 20-pin QFN (Quad Flat No-Lead) with a size of 5 x 5 mm.
- Can the SI3402-B-GM be used in place of the obsolete Si3402-A?
Yes, the SI3402-B-GM is a pin-compatible replacement for the obsolete Si3402-A.
- What are some common applications of the SI3402-B-GM?
