LTC3643
RECOMMENDED FOR NEW DESIGNS2A Bidirectional Power Backup Supply
- Part Models
- 6
- 1ku List Price
- Starting From $6.73
Overview
- Bidirectional Synchronous Boost Capacitor Charger/Buck Regulator for System Backup
- Wide Input Voltage Range: 3V to 17V
- Up to 40V Capacitor Voltage Storage for High Energy Backup
- 2A Maximum CAP Charge Current
- Integrated Power N-Channel MOSFETs (150mΩ Top and 75mΩ Bottom)
- Integrated Power N-Channel MOSFET for Output/CAP Disconnect (50mΩ)
- Input Current Limit During Charging
- Fast 1MHz Switching Frequency
- ±1% Reference Accuracy for System Voltage Regulation
- Indicator Outputs for Charge Status and Input Power Fail
- Low Profile 24-lead 3mm × 5mm QFN Package
- AEC-Q100 Qualified for Automotive Applications
The LTC3643 is a bidirectional synchronous step-up charger and step-down converter which efficiently charges a capacitor array up to 40V from an input supply between 3V to 17V. When the input supply falls below the programmable power-fail threshold, the step-up charger operates in reverse as a synchronous step-down regulator to power the system rail from the backup capacitor during this power interuption/failure condition.
When charging the backup capacitor, an external low-value sense resistor may be used to maintain an accurate current limit from the input supply or implement PowerPath™ functionality.
The step-down converter operates at a 1MHz switching frequency, allowing small external components to be used. Low quiescent current during regulation maximizes the energy usage from the backup capacitor.
Applications
- Backup Capacitor Systems
- Power Failure Backup Systems
- Solid-State Drives
- Automotive
Documentation
Data Sheet 1
User Guide 1
Design Note 2
Technical Articles 2
Product Selector Card 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 |
|---|---|---|---|
| LTC3643EUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3643EUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3643IUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3643IUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3643IUDD#WPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3643IUDD#WTRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process |
||
| LTC3643EUDD#PBF | PRODUCTION | |
| LTC3643EUDD#TRPBF | PRODUCTION | |
| LTC3643IUDD#PBF | PRODUCTION | |
| LTC3643IUDD#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Battery Charger ICs 1 | ||
| LTC4040 | RECOMMENDED FOR NEW DESIGNS | 2.5A Battery Backup Power Manager |
| Switching Regulators & Controllers 2 | ||
| LTC3110 | RECOMMENDED FOR NEW DESIGNS | 2A Bidirectional Buck-Boost DC/DC Regulator and Charger/Balancer |
| LTC3128 | RECOMMENDED FOR NEW DESIGNS | 3A Monolithic Buck-Boost Supercapacitor Charger and Balancer with Accurate Input Current Limit |
Tools & Simulations
LTspice 1
- LTC3643 Demo Circuit - Bidirectional Charger/Regulator for System Power Backup (3-17V to 5V @ 200mA)
Models for the following parts are available in LTspice:
- LTC3643
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
LTC3643 Demo Board | 2A, Bidirectional 40V Boost Charger/Buck Back-Up Power Regulator, 3V ≤ VIN ≤ 17V (Boost), VOUT = 5V @ 2A/3A/4A (Buck)