The LTC4223 series is a dual‑supply hot‑swap controller designed for Advanced Mezzanine Card (AMC) and MicroTCA backplanes. It controls a 12 V main supply and a 3.3 V auxiliary supply using an external N‑channel MOSFET, offering adjustable current limiting, circuit‑breaker protection, and thermal shutdown. The LTC4223‑1 version latches off after a fault, while the LTC4223‑2 version automatically retries.
The device includes a full set of electrical specifications, pin‑by‑pin functions, and package options (16‑lead SSOP and 5 mm × 4 mm DFN). Typical applications, functional diagrams, and related hot‑swap controller parts are also provided.
| Input Supply Range (Vec) | 2.7 V to 6 V |
|---|---|
| AUXIN Input Supply Range | 2.7 V to 6 V |
| 12V Input Supply Range | 0.3 V to 20 V |
| Adjustable Current Limit | Circuit breaker with adjustable limit |
| AUXOUT Active Current Limit | 165 mA typical (240 mA max, 330 mA absolute) |
| Gate Drive Voltage | Up to 6.2 V above 12Vour |
| Package Types | 16‑Lead SSOP and 5 mm × 4 mm DFN |
The LTC4223‑1 latches off after a fault.
The LTC4223‑2 automatically retries after a fault.
Pin 3 (12IMON) provides the 12 V current‑sense monitoring output.
The controller features an adjustable current limit with a circuit breaker.