LTC3890 / LTC3890-1 Dual Output Synchronous Controllers

Analog Devices' LTC3890 / LTC3890-1 for automotive, heavy equipment, industrial control, robotics, and telecom applications

Image of Analog Devices' LTC3890/LTC3890-1 Dual Output Synchronous ControllersAnalog Devices' LTC3890 and LTC3890-1 are high voltage, dual output synchronous step-down DC / DC controllers that draw only 50 µA when one output is active and 60 µA when both outputs are enabled. With both outputs shut down, the LTC3890 and LTC3890-1 draws a mere 14 µA.

The 4 V to 60 V input supply range is designed to protect against high voltage transients, continue operation during automotive cold crank, and cover a broad range of input sources and battery chemistries. Each output can be set from 0.8 V to 24 V at output currents up to 20 A with efficiencies as high as 95%, making it well suited for 12 V or 24 V automotive, heavy equipment, industrial control, robotics and telecom applications.

The LTC3890 and LTC3890-1 have powerful 1.1Ω on-chip MOSFET gate drivers. They operate with a selectable fixed frequency between 50 kHz and 900 kHz and can be synchronized to an external clock from 75 kHz to 850 kHz with its phased-locked loop (PLL). Output current sensing is accomplished by measuring the voltage drop across the output inductor (DCR) for the highest efficiency or by using an optional sense resistor. Current foldback limits MOSFET heat dissipation during overload conditions.

Features
  • Wide input voltage range: 4 V to 60 V
  • 50 µA quiescent current with one output active and 60 µA with both outputs active
  • 14 µA shutdown current
  • Wide output voltage range: 0.8 V to 24 V
  • Synchronous rectification for up to 95% efficiency
  • DCR or Rsense current sense
  • Selectable low ripple burst mode operation, pulse skipping, or continuous operation
  • Selectable fixed operating frequency from 50 kHz to 900 kHz
  • Synchronizable operating frequency from 75 kHz to 850 kHz with PLL
  • Current mode control for fast transient response and easy lop compensation
  • Adjustable soft-start
  • ±1% voltage reference accuracy over -40°C to +125°C
  • Output overvoltage and overcurrent foldback protection

LTC3890LTC3890-1 Dual Output Synchronous Controllers

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게시 날짜: 2013-10-11