Overview
The NCP1090DBRG, produced by onsemi, is an Integrated IEEE 802.3af Power over Ethernet Powered Device (PoE-PD) interface controller. This component is part of onsemi’s high power HIPO Power over Ethernet Powered Device product family. It integrates essential functions such as detection, classification, under-voltage lockout, inrush, and operational current limits, making it suitable for demanding environments. The NCP1090 is fabricated in a robust high voltage process and includes a rugged vertical N-channel DMOS, ensuring reliability in harsh conditions like hot swap and cable ESD events.
Key Specifications
| Parameter | Units | Min | ||
|---|---|---|---|---|
| Supply Voltage | V | 0 | - | 57 |
| Minimum Operating Temperature | °C | -40 | - | - |
| Maximum Operating Temperature | °C | - | - | 85 |
| Inrush Current Limit | mA | 75 | 120 | 170 |
| Operational Current Limit | mA | 425 | 500 | 575 |
| Pass-switch On Resistance (Rds-on) | Ω | - | 0.5 | 1 |
| Junction Temperature | °C | - | - | 125 |
Key Features
- Fully supports IEEE 802.3af specifications
- Programmable classification current
- Adjustable under-voltage lockout (NCP1091 only)
- Open-drain power good indicator
- 130 mA inrush current limit and 500 mA operational current limit
- Pass switch disabling input for rear auxiliary supply operation (NCP1092 only)
- Over-temperature protection
- Industrial temperature range: -40°C to 85°C with full operation up to 125°C junction temperature
- Hot-swap pass-switch with 0.5 Ω typical on-resistance
- Vertical N-channel DMOS pass-switch for robustness
Applications
The NCP1090DBRG is designed for use in various industrial and security applications, including but not limited to:
- Industrial devices requiring robust and reliable power management
- Security systems that need to operate in harsh environments
- Combination with stepper motor drivers, CAN bus drivers, and other high-voltage interfacing devices
- Non-PoE enabled networks with auxiliary supply options
Q & A
- What is the NCP1090DBRG used for?
The NCP1090DBRG is used as an Integrated IEEE 802.3af Power over Ethernet Powered Device (PoE-PD) interface controller.
- What are the key features of the NCP1090DBRG?
Key features include full support for IEEE 802.3af, programmable classification current, adjustable under-voltage lockout, and over-temperature protection.
- What is the operating temperature range of the NCP1090DBRG?
The operating temperature range is -40°C to 85°C, with full operation up to 125°C junction temperature.
- How does the inrush current limit work?
The inrush current limit is defined by an external Rinrush resistor connected between INRUSH and VPORTN, limiting the power dissipation over the internal pass switch.
- What is the purpose of the power good indicator?
The power good indicator signals the end of the DC-DC converter input capacitor charge and the enabling of the operational current limit.
- Can the NCP1090DBRG be used with auxiliary supplies?
- What is the maximum supply voltage for the NCP1090DBRG?
The maximum supply voltage is 57 V.
- Is the NCP1090DBRG suitable for hot-swap applications?
- How does the thermal shutdown feature work?
The thermal shutdown disables the classification block, pass switch, and power good indicator if the junction temperature exceeds the threshold, and it returns to normal operation once the temperature falls below the threshold.
- What are the package options for the NCP1090DBRG?
The component is available in SOIC-8 and TSSOP-8 packages.
