Analog Devices Inc

Analog Devices®3569 Triple Buck Regulator

Triple buck regulator with 1.2 A and two 600 mA outputs from Analog Devices

Image of Analog Devices' LTC3569Analog Devices' LTC3569 contains three monolithic, synchronous step-down DC / DC converters. Intended for medium power applications, it operates over a 2.5 V to 5.5 V input voltage range. The operating frequency is adjustable from 1 MHz to 3 MHz, allowing the use of tiny, low cost capacitors and inductors. The three output voltages are independently programmable by toggling the EN pins up to 15 times, lowering the 800 mV FB references by 25 mV per cycle. The first buck regulator sources load currents up to 1,200 mA. The other two buck regulators each provide 600 mA.

The two 600 mA buck regulators can also be configured to operate as slave power stages, running in parallel with another internal buck regulator to supply higher load currents. When operating as parallel, slave output stages, discrete external components are shared and available output currents sum together.

Diagram | Datasheet

Features
  • Three independent current mode buck DC / DC regulators (1.2 A and 2x 600 mA)
  • Single pin programmable VFB servo voltages from 800 mV down to 425 mV (in 25 mV steps)
  • Pull VFB high to make each 600 mA buck a slave for higher current operation
  • All regulators internally compensated
  • Quiescent current <100 µA (all regulators in Burst Mode® operation)
  • Tiny 3 mm × 3 mm 20-lead QFN and thermally enhanced TSSOP FE-16 packages
  • Pulse skip or Burst Mode operation
  • Programmable switching frequency (1 MHz to 3 MHz) or fixed 2.25 MHz
  • Synchronizable (1.2 MHz to 3 MHz)
  • VIN range 2.5 V to 5.5 V
  • PGOOD output flag
  • Zero shutdown current
  • Overtemperature and short-circuit protection

LTC3569 Triple Buck Regulators

ImageManufacturer Part NumberDescriptionAvailable QuantityPrice
IC REG BUCK ADJ TRPL 16TSSOPLTC3569EFE#PBFIC REG BUCK ADJ TRPL 16TSSOP143 - Immediate$8.62View Details
IC REG BUCK ADJ TRPL 20QFNLTC3569EUD#PBFIC REG BUCK ADJ TRPL 20QFN2775 - Immediate$8.37View Details
Published: 2013-10-11

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