LTC3375 Buck Regulators

By Analog Devices Inc 155

LTC3375 Buck Regulators

Linear Technology's LTC3375, is a highly-integrated general-purpose power management solution for systems requiring multiple low voltage power supplies. The device features eight independent 1 A channels with I2C control, flexible sequencing and fault monitoring in a compact QFN package. The LTC3375 contains eight internally compensated, high efficiency synchronous step-down regulators plus a high voltage always-ON 25 mA LDO controller. Each buck regulator has its own independent 2.25 V to 5.5 V input supply and an output voltage range of 0.425 V to VIN. The device’s pushbutton ON / OFF / RESET control, power-on reset and watchdog timer provide flexible and reliable power-up sequencing and system monitoring. The LTC3375 features a programmable and synchronizable 1 MHz to 3 MHz oscillator with a 2 MHz default switching frequency. Quiescent current is only 11 μA with all DC / DCs off, saving battery run time. It is ideal for a wide variety of multichannel applications including industrial, automotive and communications systems.

  • 8-channel independent step-down DC / DCs master-slave configurable for up to 4 A per output rail with a single inductor
  • All DC / DCs have 0.425 V to VIN output voltage range
  • Precision enable pin thresholds for autonomous sequencing (or I2C control)
  • I2C selectable phasing (90° steps) per channel
  • 1 MHz to 3 MHz programmable / synchronizable oscillator frequency (2 MHz default)
  • Programmable power-on reset / watchdog / pushbutton timing
  • Die temperature monitor output
  • 48-lead 7 mm × 7 mm QFN package
  • Independent VIN supply for each DC / DC (2.25 V to 5.5 V)