Analog Devices Inc

LTC3609 Monolithic Synchronous Step-Down DC / DC Converter

32 V, 6 A monolithic synchronous step-down DC / DC converter from Analog Devices

Image of Analog Devices' LTC3609 Monolithic Synchronous Step-Down DC / DC ConverterAnalog Devices' LTC3609 is a high efficiency, monolithic synchronous step-down DC / DC converter that can deliver up to 6 A output current from a 4 V to 32 V (36 V maximum) input supply. It uses a valley current control architecture to deliver very low duty cycle operation at high frequency with excellent transient response. The operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT.

The LTC3609 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit is user programmable. A power good output voltage monitor indicates when the output is in regulation. The LTC3609 is available in a compact 7 mm x 8 mm QFN package.

Features
  • 6 A output current
  • Wide VIN range = 4 V to 32 V (36 V max.)
  • Internal N-channel MOSFETs
  • True current mode control
  • Optimized for high step-down ratios
  • tON(MIN) ≤ 100 ns
  • Extremely fast transient response
  • Stable with ceramic COUT
  • ±1% 0.6 V voltage reference
  • Power good output voltage monitor
  • Adjustable on-time / switching frequency
  • Adjustable current limit
  • Programmable soft-start
  • Output overvoltage protection
  • Optional short-circuit shutdown timer
  • Low shutdown IQ: 15 µA
  • Available in a 7 mm x 8 mm 52-pin QFN package
Published: 2013-10-11