LTC4228-1
LTC4228-2
RECOMMENDED FOR NEW DESIGNS
Dual Ideal Diode and Hot Swap Controller
- Part Models
- 16
- 1ku List Price
- Starting From $5.45
Overview
- Power Path and Inrush Current Control for Redundant Supplies
- Low Loss Replacement for Power Schottky Diodes
- Protects Output Voltage from Input Brownouts
- Allows Safe Hot Swapping from a Live Backplane
- 2.9V to 18V Operating Range
- Controls N-Channel MOSFETs
- Limits Peak Fault Current in ≤1μs
- Adjustable Current Limit with Circuit Breaker
- Adjustable Current Limit Fault Delay
- Smooth Switchover without Oscillation
- 0.5μs Ideal Diode Turn-On and Turn-Off Time
- Status, Fault and Power Good Outputs
- LTC4228-1: Latch Off After Fault
- LTC4228-2: Automatic Retry After Fault
- 28-Lead 4mm × 5mm QFN and SSOP Packages
The LTC4228 offers ideal diode and Hot Swap™ functions for two power rails by controlling two external N-channel MOSFETs in each rail. MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area. Hot Swap control MOSFETs allow boards 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 LTC4228 regulates the forward voltage drop across the external MOSFETs and sense resistor 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 switch-over. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.
The LTC4228 allows independent on/off control, and reports fault and power good status for the supply. The LTC4228 improves on the LTC4225 by recovering more quickly from input brownouts to preserve the output voltage.
Applications
- Redundant Power Supplies
- MicroTCA Systems and Servers
- Telecom Networks
- Power Prioritizer
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Product Selector Card 1
Product Selection Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC4228CGN-1#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4228CGN-1#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4228CGN-2#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4228CGN-2#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4228CUFD-1#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4228CUFD-1#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4228CUFD-2#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4228CUFD-2#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4228IGN-1#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4228IGN-1#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4228IGN-2#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4228IGN-2#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4228IUFD-1#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4228IUFD-1#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4228IUFD-2#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4228IUFD-2#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL |
||
| LTC4228CGN-1#PBF | PRODUCTION | |
| LTC4228CGN-1#TRPBF | PRODUCTION | |
| LTC4228CGN-2#PBF | PRODUCTION | |
| LTC4228CGN-2#TRPBF | PRODUCTION | |
| LTC4228IGN-1#PBF | PRODUCTION | |
| LTC4228IGN-1#TRPBF | PRODUCTION | |
| LTC4228IGN-2#PBF | PRODUCTION | |
| LTC4228IGN-2#TRPBF | PRODUCTION | |
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC4228CUFD-1#PBF | PRODUCTION | |
| LTC4228CUFD-1#TRPBF | PRODUCTION | |
| LTC4228CUFD-2#PBF | PRODUCTION | |
| LTC4228CUFD-2#TRPBF | PRODUCTION | |
| LTC4228IUFD-1#PBF | PRODUCTION | |
| LTC4228IUFD-1#TRPBF | PRODUCTION | |
| LTC4228IUFD-2#PBF | PRODUCTION | |
| LTC4228IUFD-2#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 2 | ||
| LTC4227 | RECOMMENDED FOR NEW DESIGNS | Dual Ideal Diode and Single Hot Swap Controller |
| LTC4229 | RECOMMENDED FOR NEW DESIGNS | Ideal Diode and Hot Swap Controller |
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC4370 | RECOMMENDED FOR NEW DESIGNS | Two-Supply Diode-OR Current Balancing Controller |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC4236 | RECOMMENDED FOR NEW DESIGNS | Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC4228-1
- LTC4228-2
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
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