LTC3675/LTC3675-1 - 7-Channel Configurable High Power PMIC
Features
- 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
Description
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.
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 |
|---|---|---|---|---|---|
| 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 |
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 | |
|---|---|---|---|---|---|---|
| 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 | ||
| Buy Now • Request Samples | ||||||
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 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 | |
| Buy Now | |||
Applications
- 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!
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
