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Linear Technology Electronic Components Datasheet

LTC3675 Datasheet

7-Channel Configurable High Power PMIC

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DataSheet.in
FEATURES
n Four Monolithic Synchronous Buck DC/DCs
(1A/1A/500mA/500mA)
n Buck DC/DCs Can Be Paralleled to Deliver Up to
2× Current with a Single Inductor
n Independent 1A Boost and 1A Buck-Boost DC/DCs
n Dual String I2C Controlled 40V LED Driver
n I2C Programmable Output Voltage, Operating
Mode, and Switch Node Slew Rate for All DC/DCs
n I2C Read Back of DC/DC, LED Driver, Fault Status
n I2C Programmable VIN and Die Temperature
Warnings
n Maskable Interrupts to Report DC/DC, VIN and Die
Temperature Faults
n Pushbutton ON/OFF/RESET
n Always-On 25mA LDO
n Low Quiescent Current: 16μA (All DC/DCs Off)
n 4mm × 7mm × 0.75mm 44-Lead QFN Package
APPLICATIONS
n High Power (5W to 10W) Single Cell Li-Ion/Polymer
Applications
n Portable Industrial Applications, Handy Terminals,
Portable Instruments
n Multioutput Low Voltage Power Supplies
LTC3675
7-Channel Configurable
High Power PMIC
DESCRIPTION
The LTC®3675 is a digitally programmable high efficiency
multioutput power supply plus dual string LED driver IC
optimized for high power single cell Li-Ion/Polymer applica-
tions. The DC/DCs consist of four synchronous buck con-
verters (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 inde-
pendently 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 is available in a low profile (0.75mm), ther-
mally enhanced 44-lead 4mm × 7mm QFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of
Linear Technology Corporation and Hot Swap is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
TYPICAL APPLICATION
2.7V TO 5.5V
3
DIGITAL
CONTROL
PUSH BUTTON
SW1
VIN SW2
SW3
I2C
EN1
LTC3675
SW4
SW5
EN2 VOUT5
EN3 SWAB6
EN4 SWCD6
ENBB
VOUT6
IRQB
LDO_OUT
RSTB
WAKE
PBSTAT
SW7
ONB
CT
0.01μF
LED1
EXPOSED PAD LED2
3675 TA01
0.425V TO VIN, 1A MAX
0.425V TO VIN, 1A MAX
0.425V TO VIN, 500mA MAX
0.425V TO VIN, 500mA MAX
VIN
VIN TO 5.35V, 1A MAX
2.65V TO 5.25V, 1A MAX
0.8V TO VIN, 25mA MAX
VIN
••• •••
UP TO 10 LEDS
PER STRING
3675f
1


Linear Technology Electronic Components Datasheet

LTC3675 Datasheet

7-Channel Configurable High Power PMIC

No Preview Available !

DataSheet.in
LTC3675
TABLE OF CONTENTS
Features ............................................................................................................................ 1
Applications ....................................................................................................................... 1
Typical Application ............................................................................................................... 1
Description......................................................................................................................... 1
Absolute Maximum Ratings..................................................................................................... 3
Order Information................................................................................................................. 3
Pin Configuration ................................................................................................................. 3
Electrical Characteristics ........................................................................................................ 4
Typical Performance Characteristics .......................................................................................... 8
Pin Functions .....................................................................................................................14
Block Diagram....................................................................................................................16
Operation.......................................................................................................................... 17
Buck Switching Regulator .................................................................................................................................... 17
Buck Regulators with Combined Power Stages .................................................................................................... 17
Boost Switching Regulator ................................................................................................................................... 18
Buck-Boost Switching Regulator .......................................................................................................................... 18
LED Driver ............................................................................................................................................................ 18
Pushbutton Interface and Power-Up Power-Down Sequencing ............................................................................ 19
Power-Up and Power-Down via Pushbutton ......................................................................................................... 19
Power-Up and Power-Down via Enable Pin or I2C................................................................................................. 21
LED Current Programming ................................................................................................................................... 21
I2C Interface.......................................................................................................................................................... 21
Error Condition Reporting via RSTB and IRQB Pins ............................................................................................. 24
Undervoltage and Overtemperature Functionality ................................................................................................. 25
Applications Information .......................................................................................................26
Switching Regulator Output Voltage and Feedback Network................................................................................. 26
Buck Regulators ................................................................................................................................................... 26
Combined Buck Regulators .................................................................................................................................. 26
Boost Regulator.................................................................................................................................................... 27
Buck-Boost Regulator........................................................................................................................................... 28
LED Driver ............................................................................................................................................................ 28
Operating the LED Driver As a High Voltage Boost Regulator............................................................................... 29
Input and Output Decoupling Capacitor Selection................................................................................................. 29
Choosing the CT Capacitor ................................................................................................................................... 30
Programming the UVOT Register ......................................................................................................................... 30
Programming the RSTB and IRQB Mask Registers .............................................................................................. 30
Status Byte Read Back ......................................................................................................................................... 31
PCB Considerations .............................................................................................................................................. 31
Typical Applications .............................................................................................................32
Package Description ............................................................................................................35
Typical Application ..............................................................................................................36
Related Parts .....................................................................................................................36
3675f
2


Part Number LTC3675
Description 7-Channel Configurable High Power PMIC
Maker Linear Technology
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LTC3675 Datasheet PDF






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