DocumentationDatasheet
Reliability Data
Product Selector Card
LT Journal
Press Release
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Features
- Power Path and Inrush Current Control for Redundant Supplies
- Low Loss Replacement for Power Schottky Diodes
- Allows Safe Hot Swapping from a Live Backplane
- 2.9V to 18V Operating Range
- Controls N-Channel MOSFETs
- Limits Peak Fault Current in ≤1μs
- 0.5μs Ideal Diode Turn-On and Reverse Turn-Off Time
- Adjustable Current Limit with Circuit Breaker
- Smooth Switchover without Oscillation
- Adjustable Current Limit Fault Delay
- Fault and Power Status Output
- 20-Lead 4mm × 5mm QFN and 16-Lead SSOP Packages
Typical Application
Description
The LTC®4227 offers ideal diode-OR and Hot Swap™ functions for two power rails by controlling external Nchannel MOSFETs. MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area. A Hot Swap control MOSFET allows a board to be safely inserted and removed from a live backplane by limiting inrush current. The supply output is also protected against short-circuit faults with a fast acting current limit and internal timed circuit breaker.
The LTC4227 regulates the forward voltage drop across the MOSFETs to ensure smooth current transfer from one supply to the other without oscillation. The ideal diodes turn on quickly to reduce the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.
The LTC4227 allows turn-on/off control, and reports fault and power good status for the supply.
,4x5 QFN-20,SSOP-16
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC4227CGN-1#PBF | SSOP | 16 | C | $4.87 | $3.41 |
| LTC4227CGN-1#TRPBF | SSOP | 16 | C | $3.47 | |
| LTC4227CGN-2#PBF | SSOP | 16 | C | $4.87 | $3.41 |
| LTC4227CGN-2#TRPBF | SSOP | 16 | C | $3.47 | |
| LTC4227CUFD-1#PBF | QFN | 20 | C | $4.87 | $3.41 |
| LTC4227CUFD-1#TRPBF | QFN | 20 | C | $3.47 | |
| LTC4227CUFD-2#PBF | QFN | 20 | C | $4.87 | $3.41 |
| LTC4227CUFD-2#TRPBF | QFN | 20 | C | $3.47 | |
| LTC4227CUFD-3#PBF | QFN | 20 | C | $4.87 | $3.41 |
| LTC4227CUFD-3#TRPBF | QFN | 20 | C | $3.47 | |
| LTC4227CUFD-4#PBF | QFN | 20 | C | $4.87 | $3.41 |
| LTC4227CUFD-4#TRPBF | QFN | 20 | C | $3.47 | |
| LTC4227IGN-1#PBF | SSOP | 16 | I | $5.36 | $3.75 |
| LTC4227IGN-1#TRPBF | SSOP | 16 | I | $3.81 | |
| LTC4227IGN-2#PBF | SSOP | 16 | I | $5.36 | $3.75 |
| LTC4227IGN-2#TRPBF | SSOP | 16 | I | $3.81 | |
| LTC4227IUFD-1#PBF | QFN | 20 | I | $5.36 | $3.75 |
| LTC4227IUFD-1#TRPBF | QFN | 20 | I | $3.81 | |
| LTC4227IUFD-2#PBF | QFN | 20 | I | $5.36 | $3.75 |
| LTC4227IUFD-2#TRPBF | QFN | 20 | I | $3.81 | |
| LTC4227IUFD-3#PBF | QFN | 20 | I | $5.36 | $3.75 |
| LTC4227IUFD-3#TRPBF | QFN | 20 | I | $3.81 | |
| LTC4227IUFD-4#PBF | QFN | 20 | I | $5.36 | $3.75 |
| LTC4227IUFD-4#TRPBF | QFN | 20 | I | $3.81 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1625A-A | LTC4227CUFD-1 Demo Board: Dual Ideal Diode & Single Hot Swap Controller with Fault Latch-Off and 100ms On Delay | $75.00 | |
| DC1625A-B | LTC4227CUFD-2 Demo Board: Dual Ideal Diode & Single Hot Swap Controller with Fault Auto-Retry and 100ms On Delay | $75.00 | |
| DC1625A-C | LTC4227CUFD-3 Demo Board: Dual Ideal Diode & Single Hot Swap Controller with Fault Latch-Off and 1.6ms On Delay | $75.00 | |
| DC1625A-D | LTC4227CUFD-4 Demo Board: Dual Ideal Diode & Single Hot Swap Controller with Fault Auto-Retry and 1.6ms On Delay | $75.00 |