Overview
The LTC4217IDHC#PBF, produced by Analog Devices Inc., is an integrated Hot Swap controller designed to enable safe insertion and removal of a board from a live backplane. This component integrates a Hot Swap controller, a power MOSFET, and a current sense resistor into a single package, making it ideal for small form factor applications. The LTC4217 offers both adjustable and preset threshold versions, with the LTC4217-12 being a dedicated 12V version.
Key Specifications
| Parameter | Value |
|---|---|
| Current Limit | 2A (5% accurate) with foldback current limiting |
| Inrush Current Control | Separate control with adjustable slope |
| MOSFET Resistance | 25mΩ |
| Current Sense Resistor | 7.5mΩ |
| Package Types | DFN and TSSOP |
| Operating Temperature | TJMAX = 125°C |
| Thermal Resistance (θJA) | 43°C/W (soldered exposed pad), 140°C/W (unsoldered exposed pad) |
| Power Good Monitoring | PG pin signals power good condition using an open-drain pull-down transistor |
| Undervoltage and Overvoltage Protection | UVLO1, UVLO2, and OV comparators |
Key Features
- Separate inrush current control and adjustable current limit threshold
- Current monitor output for ground-referenced current sensing
- MOSFET temperature monitor output
- Thermal limit, overvoltage, undervoltage, and power good monitoring
- Cable drop compensation and foldback current limiting
- Power-up initialization with undervoltage lockout circuits (UVLO1 and UVLO2)
Applications
The LTC4217 is primarily used in Hot Swap applications where boards need to be safely inserted and removed from a live backplane. This includes high-reliability systems such as data centers, telecommunications equipment, and other applications requiring controlled power management.
Q & A
- What is the primary function of the LTC4217? The primary function of the LTC4217 is to allow safe insertion and removal of a board from a live backplane in Hot Swap applications.
- What are the package types available for the LTC4217? The LTC4217 is available in DFN and TSSOP packages.
- What is the current limit of the LTC4217? The LTC4217 has a 2A current limit with 5% accuracy and foldback current limiting.
- How is the inrush current controlled in the LTC4217? The inrush current is controlled separately with an adjustable slope.
- What types of protection does the LTC4217 offer? The LTC4217 offers thermal limit, overvoltage, undervoltage, and power good monitoring.
- How does the LTC4217 monitor the MOSFET temperature? The LTC4217 includes a MOSFET temperature monitor output.
- What is the purpose of the PG pin in the LTC4217? The PG pin signals the power good condition using an open-drain pull-down transistor.
- Can the current limit threshold be adjusted in the LTC4217? Yes, the current limit threshold can be adjusted dynamically using an external pin.
- What is the maximum operating temperature of the LTC4217? The maximum operating temperature (TJMAX) is 125°C.
- What are some common applications of the LTC4217? Common applications include data centers, telecommunications equipment, and other high-reliability systems requiring controlled power management.
