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Linear Technology Electronic Components Datasheet

LTC3675-1 Datasheet

7-Channel Configurable High Power PMIC

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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 Slave Address Options: LTC3675 = 0001001X,
LTC3675-1 = 0110100X
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
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.
LTC3675/LTC3675-1
7-Channel Configurable
High Power PMIC
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 indepen-
dently 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
programmed
vViaINI2aCndwhitihgha
die temperature may also
maskable interrupt output
be
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.
Typical Application
2.7V TO 5.5V
3
DIGITAL
CONTROL
PUSH BUTTON
SW1
VIN SW2
I2C
EN1
EN2
SW3
LTC3675/
LTC3675-1
SW4
SW5
VOUT5
EN3 SWAB6
EN4 SWCD6
ENBB
VOUT6
IRQB
LDO_OUT
RSTB
WAKE
PBSTAT
SW7
ONB
CT
0.01µF
LED1
EXPOSED PAD LED2
36751 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
For more information www.linear.com/LTC3675
36751fc
1
http://www.Datasheet4U.com


Linear Technology Electronic Components Datasheet

LTC3675-1 Datasheet

7-Channel Configurable High Power PMIC

No Preview Available !

LTC3675/LTC3675-1
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..............................................................................................................33
Package Description.............................................................................................................36
Revision History..................................................................................................................37
Typical Application...............................................................................................................38
Related Parts......................................................................................................................38
36751fc
2 For more information www.linear.com/LTC3675
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Part Number LTC3675-1
Description 7-Channel Configurable High Power PMIC
Maker Linear Technology
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