LTC3569

Triple Buck Regulator With 1.2A and Two 600mA Outputs

Image of Linear Technology's LTC3569The LTC®3569 contains three monolithic, synchronous step-down DC/DC converters. Intended for medium power applications, it operates over a 2.5V to 5.5V input voltage range. The operating frequency is adjustable from 1MHz to 3MHz, 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 800mV FB references by 25mV per cycle. The first buck regulator sources load currents up to 1200mA. The other two buck regulators each provide 600mA.

The two 600mA 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 (1.2A and 2x 600mA)
  • Single Pin Programmable VFB Servo Voltages from 800mV Down to 425mV (in 25mV Steps)
  • Pull VFB High to Make Each 600mA Buck a Slave for Higher Current Operation
  • Pulse Skip or Burst Mode® Operation
  • Programmable Switching Frequency (1MHz to 3MHz) or Fixed 2.25MHz
  • Synchronizable (1.2MHz to 3MHz)
  • VIN Range 2.5V to 5.5V
  • All Regulators Internally Compensated
  • PGOOD Output Flag
  • Quiescent Current <100µA (All Regulators in Burst Mode Operation)
  • Zero Shutdown Current
  • Overtemperature and Short-Circuit Protection
  • Tiny 3mm × 3mm 20-Lead QFN and Thermally Enhanced TSSOP FE-16 Packages

LTC3569 Triple Buck Regulators

ImageManufacturer Part NumberDescriptionFunctionOutput ConfigurationAvailable Quantity
LTC3569EUD#PBF datasheet linkIC REG BUCK ADJ TRPL SYNC 20QFNLTC3569EUD#PBFIC REG BUCK ADJ TRPL SYNC 20QFNStep-DownPositive1124 - Immediate
LTC3569EUD#PBF product page link
LTC3569EFE#PBF datasheet linkIC REG BCK ADJ TRPL SYNC 16TSSOPLTC3569EFE#PBFIC REG BCK ADJ TRPL SYNC 16TSSOPStep-DownPositive53 - Immediate
LTC3569EFE#PBF product page link
Published: 2013-10-11