Power Management PMIC & Multifunction Multitopology DC/DC

LTC3523 - Synchronous 600mA Step-Up and 400mA Step-Down DC/DC Converters

Features

  • Dual High Efficiency DC/DC Converters:
      Step-Up (VOUT = 1.8V to 5.25V, ISW = 600mA)
      Step-Down (VOUT = 0.615V to 5.5V, IOUT = 400mA)
  • 1.8V to 5.5V Input Voltage Range
  • Up to 94% Efficiency
  • Pin Selectable Burst Mode® Operation
  • 45μA Quiescent Current in Burst Mode Operation
  • 1.2MHz (LTC3523) or 2.4MHz (LTC3523-2) Switching Frequency
  • Independent Power Good Indicator Outputs
  • Integrated Soft-Start
  • Thermal and Overcurrent Protection
  • < 2μA Quiescent Current in Shutdown
  • Small 16-Lead 3mm x 3mm x 0.75mm QFN Package

Typical Application

LTC3523 Typical Application
LTC3523 Typical Application

Description

The LTC3523/LTC3523-2 combine a 600mA step-up DC/DC converter with a 400mA synchronous step-down DC/DC converter in a tiny 3mm x 3mm package. The 1.2MHz/2.4MHz switching frequencies minimize the solution footprint while maintaining high efficiency. Both converters feature soft-start and internal compensation, simplifying the design.

Both the step-up and step-down converters are current mode controlled and utilize an internal synchronous rectifier for high efficiency. The step-up supports 0% duty cycle operation and the step-down converter supports 100% duty cycle operation to extend battery run time. If the MODE pin is held high, both converters automatically transition between Burst Mode operation and PWM operation improving light load efficiency. Fixed, low noise 1.2MHz/2.4MHz PWM operation is selected when MODE is grounded.

The LTC3523/LTC3523-2 provide a sub-2μA shutdown mode, overtemperature shutdown and current limit protection on both converters. The LTC3523/LTC3523-2 are housed in a 16-lead 3mm x 3mm x 0.75mm QFN package.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
Drawing		 RoHS
LTC3523EUD-2#PBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3523EUD-2#TRPBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3523EUD#PBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3523EUD#TRPBF 3x3 QFN-16 UD E 05-08-1691 Yes


LTC3523 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC3523EUD-2#PBF 3x3 QFN-16 E $4.22 $2.95 Yes
LTC3523EUD-2#TRPBF 3x3 QFN-16 E $3.01 Yes
LTC3523EUD#PBF 3x3 QFN-16 E $4.22 $2.95 Yes
LTC3523EUD#TRPBF 3x3 QFN-16 E $3.01 Yes
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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
DC1213A LTC3523EUD | 1MHz Dual 400mA Buck + 600mA Sync Boost $125.00
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Click here to view our complete list of demo boards

Applications

  • Digital Cameras
  • Medical Instruments
  • Industrial Handhelds
  • GPS Navigators

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC3523
LTC3523-2

Technical Support