Overview
The TPS2378DDAR is an 8-pin integrated circuit designed by Texas Instruments to implement an IEEE 802.3at Type-2 powered device (PD). This device is part of the TPS2378 family and is packaged in an HSOP (8-pin) PowerPAD™ package. It integrates all the necessary features for detection, classification, and power management in high-power PoE applications. The TPS2378DDAR is particularly suited for devices that require robust power handling and advanced protection mechanisms.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Detection Bias Current (DEN open, VVDD = 10.1 V) | 3 | 4.8 | 12 | µA |
| Disable Threshold (DEN falling) | 3 | 3.7 | 5 | V |
| Operating Current Limit | - | 1 A | - | A |
| Inrush Current Limit | - | 140 mA | - | mA |
| Pass FET Resistance | 0.5 Ω | - | - | Ω |
| UVLO Rising Threshold | 36.3 | 38.1 | 40 | V |
| UVLO Falling Threshold | 30.5 | 32 | 33.6 | V |
| Thermal Shutdown | 135 | 145 | - | °C |
| ESD Capability | - | 15 kV and 8 kV | - | - |
Key Features
- IEEE 802.3at Type-2 Hardware Classification with status flag
- Low 0.5-Ω internal switch for up to 0.85 A continuous current
- Auxiliary power detect (APD) input for priority to external power adapter
- Robust 100-V, 0.5-Ω hotswap MOSFET
- 140-mA inrush current limiting and auto-retry fault protection
- Open-drain power-good output and type 2 PSE indication
- PowerPAD™ HSOP package for enhanced thermal dissipation
- System-level ESD capability of 15 kV and 8 kV
Applications
- IEEE 802.3at-compliant devices
- Video and VoIP telephones
- Multiband access points
- Security cameras
- Pico-base stations
- Forced, four-pair, high-power devices
Q & A
- What is the TPS2378DDAR used for?
The TPS2378DDAR is used to implement an IEEE 802.3at Type-2 powered device (PD) in various high-power PoE applications.
- What is the maximum continuous current the TPS2378DDAR can handle?
The TPS2378DDAR can handle up to 0.85 A of continuous current.
- What is the purpose of the APD input on the TPS2378DDAR?
The APD input provides priority for an external power adapter, allowing the device to switch between PoE and an auxiliary power source.
- What are the key protection features of the TPS2378DDAR?
The key protection features include thermal shutdown, current limit foldback, and robust 100-V internal switch.
- What is the ESD capability of the TPS2378DDAR?
The TPS2378DDAR has a system-level ESD capability of 15 kV and 8 kV.
- What type of package does the TPS2378DDAR come in?
The TPS2378DDAR comes in an HSOP (8-pin) PowerPAD™ package.
- What is the typical operating current limit of the TPS2378DDAR?
The typical operating current limit is 1 A.
- What is the inrush current limit of the TPS2378DDAR?
The inrush current limit is 140 mA.
- What are some common applications of the TPS2378DDAR?
Common applications include video and VoIP telephones, multiband access points, security cameras, and pico-base stations.
- What is the thermal shutdown temperature of the TPS2378DDAR?
The thermal shutdown temperature is between 135°C and 145°C.
