LTC3675
LTC3675-1

PRODUCTION

7-Channel Configurable High Power PMIC

Part Models: 4
1ku List Price: Starting From $6.01

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Overview

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, V_IN 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

The LTC3675/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 V_IN 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.

Applications

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

Part Models: 4
1ku List Price: Starting From $6.01

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3675EUFF#PBF	44-Lead QFN (4mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3675EUFF#TRPBF	44-Lead QFN (4mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3675EUFF-1#PBF	44-Lead QFN (4mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3675EUFF-1#TRPBF	44-Lead QFN (4mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Level Translators & Buffers 1
LTC4311	PRODUCTION	Low Voltage I²C/SMBus Accelerator
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller
Temperature Sensors 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor

Evaluation Kits

LTC3675EUFF Demo Board | 7-Output PMIC, 2.7V ≤ VIN ≤ 5.5V, Programmable Outputs

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Product Details

Demonstration circuit 1607 is a multioutput power supply with a pushbutton controller and a dual string LED driver featuring the LTC3675. The LTC3675 operates from a 2.7V to 5.5V input voltage range and has four synchronous buck regulators (1A × 2, 0.5A × 2), a buck-boost regulator (1A), a boost regulator (1A power switch), plus an always-on LDO regulator. The buck regulators may be combined together to create a higher power buck regulator with a single inductor.

The LED boost driver can drive two strings of up to 10 LEDs at up to 25mA each, two strings of 5 LEDs at up to 50mA each, or be configured as a fixed high voltage boost regulator.