Power Management Switching Regulator Step-Down (Buck) Regulators Multiple Output Buck
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 Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

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LTC3569 - Triple Buck Regulator With 1.2A and Two 600mA Outputs and Individual Programmable References

Features

  • Three Independent Current Mode Buck DC/DC Regulators (1.2A and 2 × 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-Skipping 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, 3mm × 4mm 20-Lead QFN and Thermally Enhanced TSSOP FE-16 Packages

Typical Application

LTC3569 Typical Application
LTC3569 Typical Application

Description

The LTC3569 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-20, TSSOP-16

LTC3569 Package Drawing
LTC3569 Package Drawing
LTC3569 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3569EFE#PBF TSSOP 16 E $4.57 $3.20 View
LTC3569EFE#TRPBF TSSOP 16 E $3.26 View
LTC3569EUD#PBF QFN 16 E $4.43 $3.10 View
LTC3569EUD#TRPBF QFN 16 E $3.16 View
LTC3569EUDC#PBF QFN 16 E $4.43 $3.10 View
LTC3569EUDC#TRPBF QFN 16 E $3.16 View
LTC3569IFE#PBF TSSOP 16 I $5.36 $3.75 View
LTC3569IFE#TRPBF TSSOP 16 I $3.81 View
LTC3569IUD#PBF QFN 16 I $5.22 $3.65 View
LTC3569IUD#TRPBF QFN 16 I $3.71 View
LTC3569IUDC#PBF QFN 16 I $5.22 $3.65 View
LTC3569IUDC#TRPBF QFN 16 I $3.71 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1340A LTC3569EUD Demo Board | Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References $150.00
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Click here to view our complete list of demo boards

Applications

  • Portable Applications with Multiple Supply Rails
  • General Purpose Step-Down DC/DC
  • Dynamic Voltage Scaling Applications

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LTC3569

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