Key facts
- Brand
- Linear Technology
- Model
- LTC4223
- Category
- Other Electronics
- Documents
- 4
- Languages
- EN
- Last added
- 2012-06-05
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LTC4223 Hot Swap Controller Application Note
The LTC4223 offers a compact and comprehensive Hot Swap solution for Advanced Mezzanine Cards (AdvancedMC), providing inrush control, overcurrent protection, and supply monitoring. It detects board insertion and extraction to protect the connector while delivering 12V and 3.3V auxiliary power supplies in a controlled manner.
The device features an adjustable current limit with circuit breaker function for the external MOSFET on the 12V supply and protects the internal 3.3V switch via thermal shutdown. It includes high-side current sense monitoring, auto-retry functionality (for LTC4223-2), and ignores contact bounces during card insertion.
Linear Technology LTC4223 specifications
| 12V IN supply voltage range | –0.3 V to 20 V |
|---|---|
| AUXIN supply voltage range | –0.3 V to 10 V |
| VCC supply voltage range | –0.3 V to 7 V |
| Operating temperature range (C‑type packages) | 0 °C to 70 °C |
Source: Linear Technology LTC4223-1/LTC4223-2 Dual Supply Hot Swap Controller Datasheet
All Linear Technology LTC4223 documents by type
How to use the product for one specific task, with worked examples.
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What voltage thresholds trigger the power-good or fault outputs for the supplies?
The AUXPGOOD output pulls low when the auxiliary supply exceeds 2.901V, and the 12PGOOD output pulls low when the 12V supply exceeds 10.36V.
At what temperature does the internal auxiliary switch shut off due to thermal shutdown?
The internal 3.3V auxiliary supply switch shuts off immediately if its temperature reaches 150°C.
What standards does the LTC4223 meet?
The LTC4223 meets the power requirements of the Micro Telecommunication Computing Architecture (MicroTCA) specification.
From: Linear Technology LTC4223 Hot Swap Controller Design Note 437
What is the fixed current limit for the auxiliary supply?
The auxiliary supply has a fixed 240mA active current limit.
From: Linear Technology LTC4223 Hot Swap Controller Design Note 437
What is the difference between the LTC4223‑1 and LTC4223‑2?
The LTC4223‑1 includes a latch‑off circuit breaker, while the LTC4223‑2 provides automatic retry after a fault.
From: Linear Technology LTC4223-1/LTC4223-2 Dual Supply Hot Swap Controller Datasheet
How is the 12 V supply turned on?
A rising edge on the 12ON pin turns on the external N‑channel MOSFET that drives the 12 V supply.
From: Linear Technology LTC4223-1/LTC4223-2 Dual Supply Hot Swap Controller Datasheet