LTC3675/LTC3675-1 - 7-Channel Configurable High Power PMIC


  • Four Monolithic Synchronous Buck DC/DCs (1A/1A/500mA/500mA)
  • Buck DC/DCs Can Be Paralleled to Deliver Up to 2× Current with a Single Inductor
  • Independent 1A Boost and 1A Buck-Boost DC/DCs
  • Dual String I2C Controlled 40V LED Driver
  • I2C Programmable Output Voltage, Operating Mode, and Switch Node Slew Rate for All DC/DCs
  • I2C Read Back of DC/DC, LED Driver, Fault Status
  • I2C Slave Address Options: LTC3675 = 0001001X, LTC3675-1 = 0110100X
  • Maskable Interrupts to Report DC/DC, VIN and Die Temperature Faults
  • Pushbutton ON/OFF/RESET
  • Always-On 25mA LDO
  • Low Quiescent Current: 16μA (All DC/DCs Off)
  • 4mm × 7mm × 0.75mm 44-Lead QFN Package

Typical Application

LTC3675 Typical Application
LTC3675 Typical Application


The LTC®3675/LTC3675-1 are a digitally programmable high efficiency multioutput power supplies plus dual string LED driver ICs optimized for high power single cell Li-Ion/Polymer applications. The DC/DCs consist of four synchronous buck converters (1A/1A/500mA/500mA), one synchronous boost DC/DC (1A), and one buck-boost DC/ DC (1A) all powered from a 2.7V to 5.5V input. The 40V LED driver can regulate up to 25mA of current through two LED strings with up to 10 LEDs each. The LED driver may also be configured as a general purpose high voltage boost converter.

DC/DC enables, output voltages, switch slew rates and operating modes may all be independently programmed over I2C or used in standalone mode via simple I/O and power-up defaults. The buck DC/DCs may be used independently or paralleled to achieve higher output currents with a shared inductor. LED enable, 60dB brightness control and up/down gradation are programmed using I2C. Alarm levels for low VIN and high die temperature may also be programmed via I2C with a maskable interrupt output to monitor DC/DC and system faults.

Pushbutton ON/OFF/RESET control and a power-on reset output provide flexible and reliable power-up sequencing. The LTC3675/LTC3675-1 are available in a low profile (0.75mm), thermally enhanced 44-lead 4mm × 7mm QFN package.


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
LTC3675EUFF-1#PBF 4x7 QFN-44 UFF E 05-08-1762 Yes
LTC3675EUFF-1#TRPBF 4x7 QFN-44 UFF E 05-08-1762 Yes
LTC3675EUFF#PBF 4x7 QFN-44 UFF E 05-08-1762 Yes
LTC3675EUFF#TRPBF 4x7 QFN-44 UFF E 05-08-1762 Yes

LTC3675 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
LTC3675EUFF-1#PBF 4x7 QFN-44 E $7.22 $5.05 Yes
LTC3675EUFF-1#TRPBF 4x7 QFN-44 E $5.11 Yes
LTC3675EUFF#PBF 4x7 QFN-44 E $7.22 $5.05 Yes
LTC3675EUFF#TRPBF 4x7 QFN-44 E $5.11 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
DC1607A LTC3675EUFF Demo Board | 7-Output PMIC, 2.7V ≤ VIN ≤ 5.5V, Programmable Outputs $175.00
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Companion Boards

Part Number Description Price Documentation
DC590B Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards $50.00
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Click here to view our complete list of demo boards


  • High Power (5W to 10W) Single Cell Li-Ion/Polymer Applications
  • Portable Industrial Applications, Handy Terminals, Portable Instruments
  • Multioutput Low Voltage Power Supplies

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

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