LTC3675
7-Channel Configurable
High Power PMIC
FEATURES
DESCRIPTION
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Four Monolithic Synchronous Buck DC/DCs
The LTC®3675 is a digitally programmable high efficiency
multioutput power supply plus dual string LED driver IC
optimizedforhighpowersinglecellLi-Ion/Polymerapplica-
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.
(1A/1A/500mA/500mA)
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Buck DC/DCs Can Be Paralleled to Deliver Up to
2× Current with a Single Inductor
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Independent 1A Boost and 1A Buck-Boost DC/DCs
2
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Dual String I C Controlled 40V LED Driver
2
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I C Programmable Output Voltage, Operating
Mode, and Switch Node Slew Rate for All DC/DCs
2
2
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I C Read Back of DC/DC, LED Driver, Fault Status
I C Programmable V and Die Temperature
IN
Warnings
DC/DC enables, output voltages, switch slew rates and
operating modes may all be independently programmed
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Maskable Interrupts to Report DC/DC, V and Die
IN
2
Temperature Faults
over I C or used in standalone mode via simple I/O and
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Pushbutton ON/OFF/RESET
power-up defaults. The buck DC/DCs may be used inde-
pendently or paralleled to achieve higher output currents
withasharedinductor.LEDenable,60dBbrightnesscontrol
Always-On 25mA LDO
Low Quiescent Current: 16μA (All DC/DCs Off)
4mm × 7mm × 0.75mm 44-Lead QFN Package
2
and up/down gradation are programmed using I C. Alarm
levels for low V and high die temperature may also be
IN
2
programmed via I C with a maskable interrupt output to
APPLICATIONS
monitor DC/DC and system faults.
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High Power (5W to 10W) Single Cell Li-Ion/Polymer
Applications
Pushbutton ON/OFF/RESET control and a power-on reset
output provide flexible and reliable power-up sequenc-
ing. The LTC3675 is available in a low profile (0.75mm),
thermally 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.
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Portable Industrial Applications, Handy Terminals,
Portable Instruments
Multioutput Low Voltage Power Supplies
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TYPICAL APPLICATION
SW1
SW2
0.425V TO V , 1A MAX
IN
2.7V TO 5.5V
V
IN
0.425V TO V , 1A MAX
IN
SW3
0.425V TO V , 500mA MAX
IN
0.425V TO V , 500mA MAX
3
2
I C
SW4
SW5
IN
LTC3675
EN1
V
IN
V
IN
EN2
VOUT5
SWAB6
SWCD6
VOUT6
TO 5.35V, 1A MAX
EN3
DIGITAL
CONTROL
EN4
ENBB
IRQB
RSTB
WAKE
PBSTAT
2.65V TO 5.25V, 1A MAX
0.8V TO V , 25mA MAX
LDO_OUT
IN
V
IN
SW7
ONB
PUSH BUTTON
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•
•
•
•
•
CT
LED1
LED2
0.01μF
EXPOSED PAD
UP TO 10 LEDS
PER STRING
3675 TA01
3675fa
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