LTC3675 7-Channel, Configurable High Power PMIC (Power Management Integrated Circuit) Application Circuit

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description

The LTC3675 is a digitally programmable, high efficiency, multi-output power supply and two string LED driver IC optimized for high power single cell Li-Ion/Li-Polymer battery applications. The DC/DC includes four synchronous buck converters (1A / 1A / 500mA / 500mA), one synchronous step-up DC/DC (1A) and one buck-boost DC/DC (1A). They are all powered by a 2.7V to 5.5V input. The 40V LED driver regulates up to 25mA of current through two strings of LEDs (up to 10 LEDs per string). The LED driver can also be configured as a general purpose high voltage boost converter.

The DC/DC enable, output voltage, switching slew rate, and operating mode can all be set individually via I2C, or in a single mode with simple I/O and power-up defaults. The step-down DC/DC can be used alone or in parallel to provide a higher output current with a shared inductor. LED enable, 60dB brightness control and grayscale increase and decrease are set by I2C. Alarm levels for low VIN and high chip temperatures can also be set via I2C and utilize a maskable interrupt output to monitor DC/DC and system faults.

The button ON / OFF / reset control and a power-on reset output provide flexibility and reliable power sequencing. The LTC3675 is available in a low profile (0.75mm height), thermally enhanced 44-pin 4mm x 7mm QFN package.

Characteristics

• 4 monolithic, synchronous step-down DC/DC (1A / 1A / 500mA / 500mA)
• Step-down DC/DC can be connected in parallel to provide up to 2x current along with a single inductor
• Independent 1A boost and 1A buck-boost DC/DC
• Two strings of I2C controlled 40V LED drivers
• All DC/DC output voltages, operating modes, and switching node slew rates can be set via I2C
• DC/DC, LED driver, I2C readback of fault status
• I2C Programmable VIN and Chip Temperature Alarm
• Shieldable interrupts for reporting DC/DC, VIN, and chip temperature faults
• Button ON / OFF / reset
• 25mA LDO always on
• Low quiescent current: 16μA (all DC/DC are off)
• 4mm x 7mm x 0.75mm 44-Pin QFN Package

application

• High Power (5W to 10W) ​​Single Cell Lithium Ion / Lithium Polymer Battery Applications
• Portable industrial applications, handheld terminals, portable instruments
• Multiple output low voltage power supply

LTC3675 Typical Application Circuit

The above is part of the information, see the PDF document for more details!