Features and Benefits
- Hot Swap™ Controller for Positive and Negative Supplies
- Supply Tracking Mode
- ±2.7V to ±16.5V Operation
- Analog Current Limit with Foldback
- Allows Safe Board Insertion and Removal from a Live Backplane
- Open-Collector Power Good Comparators
- Automatic Retry or Latchoff After a Current Fault
- Dual Undervoltage Lockout Comparator Inputs
- Current Fault Indication
The LT4220 16-pin dual voltage Hot Swap controller allows a board to be safely inserted and removed from a live backplane. The device operates with any combination of 2.7V to 16.5V and –2.7V to –16.5V supplies. Using two external N-channel pass transistors, the board supply voltages can be ramped up at an adjustable rate. A selectable tracking mode allows dual supply tracking control for ramping the positive and negative supplies together.
The LT4220 features foldback current limit and latches off both gates if either supply remains in current limit longer than an adjustable time amount. The IC can be configured for automatic restart after a delay set by the same timer.
A power good signal indicates when the output voltages monitored by the two FB comparators are within tolerance, and the gate drive signals are at their full on voltage.
The LT4220 is available in a 16-lead narrow SSOP package.
- Live Board Insertion
- RAID Systems
- –5.2V ECL Supplies
- Industrial Controls
- Split Supply Systems
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Tools & Simulations
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.