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LTM8008
SIMPLIFIED BLOCK DIAGRAM
EXTERNAL
POWER
COMPONENTS
SW
?
V IN
INTV CC
RUN
SS
SYNC
LINEAR
PRE-REGULATOR
Q1
SPV
5.6V
V OUT1
5V AT 500mA
V OUT6
3.3V AT 300mA
V OUT2
5V AT 150mA
RT
V C
SEPIC
CONTROLLER
LINEAR
POST
REGULATORS
V OUT3
5V AT 150mA
V OUT4
5V AT 150mA
V OUT5
5V AT 150mA
GND
8008 BD
OPERATION
The LTM8008 is a SEPIC equipped with six high perfor-
mance linear post regulators. The device contains the SEPIC
power MOSFET, controller, linear regulators and optimized
support circuitry. The current limit for the SEPIC converter
is internally set to 8.2A. The output of the SEPIC converter
is internally set to 5.6V, which is the optimal voltage for
running the six post regulators at the best combination
of efficiency, ripple rejection and thermal performance.
The SEPIC converter is equipped with several control pins.
These include RUN for enabling and sequencing, SS for
soft-start control, SYNC for frequency synchronization, RT
for setting the operating frequency and V C for frequency
compensation. There are also power ports, V IN , INTV CC ,
SPV and the six post regulator outputs, V OUT1,2,3,4,5,6 , as
well as the SEPIC converter switch node, SW.
Of the six linear post regulators, one produces 5V at 500mA,
a second produces 3.3V at 300mA and the remaining
four provide 5V at 150mA each. Each one is individually
equipped with overcurrent, reverse voltage and thermal
protection.
8008fa
7
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