LTC4421
RECOMMENDED FOR NEW DESIGNSHigh Power Prioritized PowerPath Controller
- Part Models
- 14
- 1ku List Price
- Starting From $5.89
Overview
- 0V to 36V Wide Operating Range (60V Tolerant)
- Drives Large External N-Channel MOSFETs for High Output Current Applications
- Accurately Limits Inrush Current
- Connects Highest Priority Valid Supply to Output Load
- Changes Channel Priority in Real Time
- ±2% OV, UV Input Comparators
- Individually Adjustable Current Limit Time-Out for Each Channel
- Adjustable Input Validation Time
- Fast Switchover Minimizes VOUT Droop
- 36-Lead 5mm × 6mm QFN and SSOP Packages
- AEC-Qualified for Automotive Applications
The LTC4421 connects one of two input supplies to a common output based on user-defined priority and validity. By definition, the supply connected to V1 is the higher priority supply, although this can be changed dynamically. External resistive dividers set the undervoltage and overvoltage thresholds that bound the valid voltage window.
Strong gate drivers switch the large external N-channel MOSFETs quickly. Fast switchover circuitry minimizes output droop when changing channels while preventing reverse and cross conduction. A fast comparator detects input short circuits and quickly turns off the N-channel MOSFETs to minimize disruption.
External sense resistors set the maximum inrush and current limit currents. During current limiting, the LTC4421 controls the N-channel MOSFET gate to regulate 25mV across the sense resistor. When the sense resistor voltage has been regulated to 25mV for a user-settable time, the channel is disconnected and a fault is set.
Applications
- High Reliability Systems
- Server Based Back-Up Systems
- Industrial Handheld Instruments
- Battery Back-Up Systems
- Automotive Applications
Documentation
Data Sheet 1
User Guide 1
Video 2
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 |
|---|---|---|---|
| LTC4421CG#PBF | 36-Lead SSOP | ||
| LTC4421CG#TRPBF | 36-Lead SSOP | ||
| LTC4421CUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LTC4421CUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LTC4421HG#PBF | 36-Lead SSOP | ||
| LTC4421HG#TRPBF | 36-Lead SSOP | ||
| LTC4421HG#WPBF | SSOP | ||
| LTC4421HG#WTRPBF | SSOP | ||
| LTC4421HUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LTC4421HUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LTC4421IG#PBF | 36-Lead SSOP | ||
| LTC4421IG#TRPBF | 36-Lead SSOP | ||
| LTC4421IUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LTC4421IUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG |
||
| LTC4421CG#PBF | PRODUCTION | |
| LTC4421CG#TRPBF | PRODUCTION | |
| LTC4421HG#PBF | PRODUCTION | |
| LTC4421HG#TRPBF | PRODUCTION | |
| LTC4421IG#PBF | PRODUCTION | |
| LTC4421IG#TRPBF | PRODUCTION | |
|
Nov 18, 2019 - 19_0266 Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC |
||
| LTC4421CG#PBF | PRODUCTION | |
| LTC4421CG#TRPBF | PRODUCTION | |
| LTC4421HG#PBF | PRODUCTION | |
| LTC4421HG#TRPBF | PRODUCTION | |
| LTC4421IG#PBF | PRODUCTION | |
| LTC4421IG#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC4421
Design Tool 1
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
LTC4421 Demo Board | Dual Channel Prioritized Powerpath Controller