LTC3675_12 Datasheet, PDF (1/38 Pages) Linear Technology – 7-Channel Confi gurable High Power PMIC

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 I}²_{C Controlled 40V LED Driver}
n _I²_{C Programmable Output Voltage, Operating}
Mode, and Switch Node Slew Rate for All DC/DCs
n _I²_{C Read Back of DC/DC, LED Driver, Fault Status}
n _I²_{C 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 V_IN 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 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.
TYPICAL APPLICATION
2.7V TO 5.5V
3
DIGITAL
CONTROL
PUSH BUTTON
SW1
V_IN
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 V_IN, 1A MAX
0.425V TO V_IN, 1A MAX
0.425V TO V_IN, 500mA MAX
0.425V TO V_IN, 500mA MAX
V_IN
V_IN TO 5.35V, 1A MAX
2.65V TO 5.25V, 1A MAX
0.8V TO V_IN, 25mA MAX
V_IN
•••
•••
UP TO 10 LEDS
PER STRING
3675fa
1