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FEATURES
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Digital
programming
of all
major
parameters
via
I2C
interface
and
non-volatile
memory
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Output
voltage
set
point
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Individual
dimming
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Output
power-up/down
sequencing
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Digital
soft-start
and
output
slew
rate
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Input/Battery
voltage
monitoring
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UV/OV
monitoring
of all
outputs
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Enable/Disable
outputs
independently
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Five
output
channels
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One
synchronous
step-down
(buck)
channels
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Two
step-up
(boost)
channels
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One
inverting
(buck-boost)
channel
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One
fixed
output
+3.3V
LDO
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+2.7V
to
+6.0V
Input
Range
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Highly
accurate
reference
and
output
voltage
(<0.5%)
with
Active
DC
Output
Control
(ADOC™)
technology
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Supports
multiple
strings
of up
to 12
white
LEDs
in
series
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Undervoltage
Lockout
(UVLO)
with
hysteresis
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800
kHz
operating
frequency
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96
bytes
of
user
configurable
nonvolatile
memory
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APPLICATIONS
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White
LED
backlighting
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High-power
LED
driving
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TFT/LCD
Displays/Monitors/TV's
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Digital
camcorders/still
cameras
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Portable
DVD/MP3/GPS
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Camera/smart
phones
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Mobile
Computing/PDA's
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SMB112-
Five-Channel
Digitally Programmable White
LED and TFT-LCD Power
Manager
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INTRODUCTION
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The
SMB112 is a
highly
integrated and
flexible
five-channel
power manager
designed for
powering
TFT/LCD display
panels and for
driving low-
and high-power
white-LEDs. The
built-in
digital
programmability
allows system
designers to
custom tailor
the device to
suit almost any
multichannel
power supply
application
from digital
camcorders to
mobile
phones.
The SMB112
integrates all
the essential
blocks required
to implement a
complete
five-channel
power subsystem
for TFT/LCD
panels
including a
synchronous
step-down
"buck"
converter, two
step-up "boost"
converters, one
inverting
"buckboost"
converter and
one fixed
output +3.3V
LDO.
Additionally
sophisticated
power
control/monitoring
functions
required by
complex systems
are built-in.
These include
digitally
programmable
output voltage
set point,
individual
dimming,
power-up/down
sequencing,
enable/disable,
margining and
UV/OV/input/output
monitoring on
all
channels.
The integration
of features and
built-in
flexibility of
the SMB112
allows the
system designer
to create a
"platform
solution" that
can be easily
modified via
software
without major
hardware
changes.
Combined with
the
re-programmability
of the SMB112
this
facilitates
rapid design
cycles and
proliferation
from a base
design to
future
generations of
product.
The SMB112 is
suited to
battery-powered
applications
with an input
range of +2.7V
to +6.0V.
Output voltages
are extremely
accurate
(<0.5%)
employing
proprietary
ADOC™
technology.
Communication
is via the
industry
standard I2C
bus. All
userprogrammed
settings are
stored in
non-volatile
EEPROM of which
96 bytes may be
used for
general-purpose
memory
applications.
The operating
temperature
range is 0C to
+70C and the
available
package is a
lead-free,
Green, RoHS
compliant,
32-pad
QFN-32.
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Figure
1 - Applications
schematic featuring the
SMB112 Five-channel,
programmable DC-DC
controller
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Note:
This is an applications
example only. Some pins,
components and values
are not shown.
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