Configurable 7-Channel High Power PMIC 2.7V to 5.5V 3 5 Pushbutton I2C VIN EN SW1-4 4 4 Buck Converters (500mA ×2, 1A ×2) VOUT5 Boost Converter (Up to 1A) VOUT6 Buck-Boost Converter (Up to 1A) 25mA LDO LDO ONB SW7 4mm Up to 10 LEDs 40V LED Driver LTC3675 7mm • • • • • • LED1 LED2 GND QFN-44 4 Parallelable Bucks + Buck-Boost + Boost + LDO + LED Driver + I2C Control + Pushbutton Control = Complete, High Power and Flexible Power Management Solution The LTC®3675 is a highly integrated general-purpose power management solution for high power single cell Lithium-Ion/Polymer systems. The device features seven independent rails plus LED driver, with I2C control, flexible sequencing and fault monitoring in a compact 28mm2 QFN package. The device’s seven channels include four high current, high efficiency step-down regulators, a high current/high efficiency buck-boost regulator, a high current/high efficiency boost regulator and one always-on 25mA LDO. Features Four Monolithic Synchronous Buck DC/DCs (1A/1A/500mA/500mA) Adjacent Buck DC/DCs Can Be Paralleled to Deliver Up to 2× Current with a Single Inductor Independent 1A Buck-Boost and 1A Boost DC/DCs Dual String I2C-Controlled LED Driver Always-On 25mA LDO 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 Programmable VIN and Die Temperature Warnings Maskable Interrupts to Report DC/DC Errors, Input Undervoltage and Die Temperature Warnings Pushbutton ON/OFF/RESET Low Quiescent Current: 16µA (All DC/DCs Off) Thermally Enhanced, 4mm × 7mm × 0.75mm 44-Lead QFN Package n LTC3675 Demo Board n n n n n 25mm n n n n n n Applications 25mm High Power (5W to 10W) Single Cell Li-Ion/Polymer Applications Portable Industrial Applications, Handy Terminals, Portable Instruments Multioutput Low Voltage Power Supplies n n n L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. VIN 4 Configurable Sync Buck Regulators VIN Adjacent Bucks Can Be Paralleled to Deliver Up to 2× Current with a Single Inductor. VOUT5 6 5 2 1 FB5 VIN 1A BUCK-BOOST REGULATOR SW1 FB1 SW5 1A BOOST REGULATOR LTC3675 VIN VOUT6 BUCK REGULATOR 1 1A 8 3 4 SWAB6 MODULATION CONTROL SWCD6 FB6 FB2 BUCK REGULATOR 2 1A ENBB VIN REF, CLK EN2 LED1 LED2 BANDGAP, OSCILLATOR, UV, OT MODULATION CONTROL SW7 12 I2C Control Programmable DC/DC Enables, Output Voltages, Switch Slew Rates, Operating Modes, Alarm Levels for Low VIN and High Die Temperature, Plus LED Driver’s LED Enable, 60dB Brightness Control and Up/Down Gradation. 10 SW3 FB3 LED DRIVER BUCK REGULATOR 3 500mA VIN EN3 VIN LED_OV – + LDO 14 13 40 42 38 44 LDO_OUT MASTER/SLAVE LINES LDOFB DVCC SW4 FB4 EN4 TOP LOGIC, CT OSCILLATOR, TIMING BUCK REGULATOR 4 500mA 36 37 17 21 27 16 31 1A Sync Boost Regulator For High Efficiency 5V I/O Rails. 1A Sync BuckBoost Regulator Typically For High Efficiency 3.3V Rails. 40V Dual String LED Driver Can Regulate Up to 25mA of Current Through Two LED Strings with Up to 10 LEDs Each. Also Configurable as a High Voltage Boost Converter Up to 40V Output. VIN DAC BITS, SLEW CONTROL, GRADATION, STATUS BITS 11 35 18,19, 20 LED_FS 15 32 VIN SW2 MASTER/SLAVE LINES 9 33 EN1 MASTER/SLAVE LINES 7 34 SCL I2C SDA RSTB IRQB PBSTAT WAKE CT ONB GND 30 29 Always-On LDO For Keep-Alive or RTC Rails. 41 39 43 23 24 25 26 22 28 Pushbutton Control ON/OFF/RESET Control and a Power-On Reset Output Provide Flexible and Reliable Power-Up Sequencing. 45 Switching Regulator Slew Rate Control Reduces Radiated EMI and Conducted Supply Noise While Maintaining High Efficiency. High Voltage Boost Regulator, Efficiency vs Load 100 100 90 90 80 80 70 70 60 50 VOUT3 = 1.8V VIN = 2.7V Burst Mode® OPERATION VIN = 3.6V Burst Mode OPERATION VIN = 5.5V Burst Mode OPERATION VIN = 2.7V PULSE SKIPPING-MODE VIN = 3.6V PULSE SKIPPING-MODE VIN = 5.5V PULSE SKIPPING-MODE 40 30 20 10 0 1 10 100 LOAD CURRENT (mA) 1000 EFFICIENCY (%) EFFICIENCY (%) 500mA Buck Regulators, Efficiency vs Load VIN = 5.5V VIN = 2.7V 60 VIN = 3.6V 50 40 30 20 MODE1 = 1, MODE0 = 0 VOUT = 12V 10 0 1 10 100 LOAD CURRENT (mA) 1000 www.linear.com/3675 n 1-800-4-LINEAR 1010