Categories: Components

2A Single-Inductor Bidirectional Power Backup Supply Provides Continuous Power During Input Supply Disruption

Linear Technology Corporation introduces the LTC3643, a bidirectional, high voltage boost capacitor charger that automatically converts to a buck regulator for system backup. The proprietary, single-inductor topology with integrated PowerPath™ functionality does the work of two separate switching regulators, reducing size, cost and complexity. The LTC3643 operates in two modes – boost charge mode and buck backup mode. The charging mode efficiently charges an electrolytic capacitor array up to 40V with an internal switch current rating of 2A from an input supply between 3V to 17V. In backup mode, when the input supply falls below the programmable power-fail (PFI) threshold, the step-up charger operates in reverse as a synchronous step-down regulator to power and hold up the system rail from the backup capacitor. During backup, the current limit can be programmed from 2A to 4A, making this device ideal for high energy, relatively short duration backup capacitor systems, power failure backup systems, solid-state drives and battery stack charging applications.

When charging the backup capacitor, an external low-value sense resistor can be used by the LTC3643 to maintain an accurate current limit from the input supply while prioritizing power delivery to the system load. Input current limit can be programmed with the 50mV threshold across a current sense resistor, preventing system power source by reducing capacitor charging current. The step-down converter operates at a 1MHz frequency, minimizing the size of external components. Low quiescent current Burst Mode® operation during regulation maximizes the energy usage from the backup capacitor. The LTC3643 provides ideal diode operation at the input supply by providing the gate drive signal to an external PMOS switch. This enables efficient power delivery while providing complete isolation between the input supply and the system load during backup mode. Other features include an integrated power N-channel MOSFET for output/CAP disconnect, ±1% reference accuracy for system voltage regulation, and indicator outputs for charge status and input power fail.

The LTC3643 is housed in compact, thermally enhanced 24-lead 3mm x 5mm QFN package, featuring E- and I-grade operation from -40°C to 125°C. Pricing for the E-grade device starts at $4.45 each in 1,000-piece quantities, and all are available from stock. For more information, visit www.linear.com/product/LTC3643.

Summary of Features: LTC3643

  • 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 (150mOhm Top and 75mOhm Bottom)
  • Integrated Power N-Channel MOSFET for Output/CAP Disconnect (50mOhm)
  • Input Current Limit During Charging
  • Fast 1MHz Switching Frequency
  • ±1% Reference Accuracy for System Voltage Regulation
  • Indicator Outputs for Charge Status & Input Power Fail
  • Low Profile 24-Lead 3mm x 5mm QFN Package
Liat

Recent Posts

Molex Anticipates Steady Growth in High-Speed Connectivity in 2025, Driving Electronics Design Innovations Across Diverse Industry Sectors

• Increase in opportunities predicted for high-speed optical transceivers and miniaturized connectivity solutions to address…

2 days ago

Alphawave Semi Drives Innovation in Hyperscale AI Accelerators with Advanced I/O Chiplet for Rebellions Inc

Rebellions Selects Alphawave Semi's Multiprotocol Chiplet Solutions To Deliver Breakthrough Performance in Generative AI workloads…

2 days ago

Valeo & ROHM Semiconductor co-develop the next generation of power electronics

Valeo, a leading automotive technology company, and ROHM Semiconductor, a major semiconductor and electronic component…

2 days ago

New EiceDRIVER™ Power family of full-bridge transformer drivers for compact and cost-effective gate driver supplies

 Infineon Technologies AG (FSE: IFX / OTCQX: IFNNY) introduces the EiceDRIVER™ Power 2EP1xxR family of…

2 days ago

Unparalleled accuracy and longevity: Panasonic Industry presents brand new ultra-compact Air Quality Sensor

Next level monitoring precision of particulate matter, temperature, humidity, and total volatile organic compounds (TVOCs)…

2 days ago

Bitsight to Acquire Cyber Threat Intelligence Leader Cybersixgill to Help Enterprises to Preempt Cyber Attacks

Plans to Deliver Advanced Threat Intelligence within its Attack Surface and Third-Party Risk Solutions  Bitsight,…

4 days ago