LTC3626 Linear Regulators

By Analog Devices Inc 217

LTC3626 Linear Regulators

The Linear Technology LTC3626 is a high efficiency, 3 MHz, synchronous buck regulator that offers both input and output current limiting and monitoring. It incorporates a unique constant frequency / controlled on-time, current-mode architecture that delivers up to 2.5 A of continuous output current at output voltages as low as 0.6 V from a 3 mm x 4 mm QFN package. Its current-mode operation offers excellent line and load transient response, even with high step-down ratios.

The LTC3626 operates from an input voltage range of 3.6 V to 20 V, making it suitable for a wide range of applications including dual/multiple-cell Li-Ion battery stacks and 5 V to 18 V intermediate bus systems. Its average input current and output current limiting are pin-programmable, making it well-suited for applications such as USB power. The LTC3626’s switching frequency is user programmable and synchronizable from 500 kHz to 3 MHz, enabling the use of tiny, low cost capacitors and inductors.

  • 3.6 V to 20 V input voltage range
  • Wide output voltage range of 0.6 V to 97% VIN optimized for 0.6 V to 6 V
  • Low RDS(ON) integrated switches provide up to 95% efficiency
  • Up to 2.5 A of output current
  • Average input and output current monitoring
  • Programmable average input / output current limit
  • Die temperature monitor and programmable limit
  • User selectable Burst Mode® or forced continuous operation
  • Adjustable switching frequency: 500 kHz to 3 MHz
  • External frequency synchronization
  • Current mode operation for excellent line and load transient response
  • Output voltage tracking capability
  • 0.6 V reference with 1% accuracy over temperature
  • Power good status output
  • Short-circuit protected
  • Available in small, thermally enhanced, 20-lead (3 mm × 4 mm) QFN package

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