LTC3643

RECOMMENDED FOR NEW DESIGNS

2A Bidirectional Power Backup Supply

Data Sheet Product Selection Table
Part Models
4
1ku List Price
Starting From $5.31
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Part Details

  • 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
LTC3643
2A Bidirectional Power Backup Supply
40V Backup System Regulating System Supply to 5V Approximate Charge/Backup Time Per 1mF of Storage Cap (40V Backup) Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 2

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Supercapacitor Chargers 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
Switching Battery Chargers 1
LTC4040
RECOMMENDED FOR NEW DESIGNS 2.5A Battery Backup Power Manager
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3643
LTspice

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

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC2220A

LTC3643 Demo Board | 2A, Bidirectional 40V Boost Charger/Buck Back-Up Power Regulator, 3V ≤ VIN ≤ 17V (Boost), VOUT = 5V @ 2A/3A/4A (Buck)

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Product Details

Demonstration circuit 2220A is a 2A, bidirectional charger/regulator featuring the LTC3643, a bidirectional synchronous step-up charger and step-down converter. DC2220A implements backup by charging a storage capacitor up to approximately 40V in boost mode, when the input voltage is present. It discharges the storage capacitor in buck mode, providing a regulated load voltage 5V when the input is removed. Its wide voltage range, both in capacitor charger mode and in system backup mode, makes it well suited to a wide variety of applications. The ability of the LTC3643 to boost an input rail to a relatively high voltage of 40V, combined with the DC2220 option of adding external capacitor banks, makes this regulator an excellent choice for energy storage applications.
DC2220A
LTC3643 Demo Board | 2A, Bidirectional 40V Boost Charger/Buck Back-Up Power Regulator, 3V ≤ VIN ≤ 17V (Boost), VOUT = 5V @ 2A/3A/4A (Buck)
DC2220A Demo Board DC2220A Demo Board DC2220A Demo Board DC2220A Demo Board DC2220A - Schematic

Latest Discussions

46 Weeks Ago
RE: LTC3643 - Pass through when /RUN
2 Years Ago
RE: LTC3643 Has VIN pin shorted when 12V applied
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