SMB112
Preliminary Information
Five-Channel Digitally Programmable White-LED and TFT/LCD Power Manager
FEATURES & APPLICATIONS
INTRODUCTION
• Digital programming of all major parameters via I2C
interface and non-volatile memory
o Output voltage set-point
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 multi-channel power
supply application from digital camcorders to mobile phones.
o Individual dimming
o Output power-up/down sequencing
o Digital soft-start and output slew rate
o Input/Battery voltage monitoring
o UV/OV monitoring of all outputs
o Enable/Disable outputs independently
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”
controller, two step-up “boost” controllers, one inverting “buck-
boost” controller and one fixed output +3.3V LDO. Additionally
sophisticated power control/monitoring functions required by
• Five output channels
o One synchronous step-down (buck) channel
o Two step-up (boost) channels
o One inverting (buck-boost) channel
oOne fixed output +3.3V LDO
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.
• +2.7V to +6.0V Input Range
• Highly accurate reference and output voltage (<0.5%)
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
with Active DC Output Control (ADOC™) technology
• Supports multiple strings of up to 12 white LEDs in
series
changes.
Combined with the re-programmability of the
• Undervoltage Lockout (UVLO) with hysteresis
• 800 kHz operating frequency
SMB112 this facilitates rapid design cycles and proliferation
from a base design to future generations of product.
• 96 bytes of user configurable nonvolatile memory
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 user-
programmed 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.
Applications
• White LED backlighting
• High-power LED driving
• TFT/LCD Displays/Monitors/TV’s
• Digital camcorders/still cameras
• Portable DVD/MP3/GPS
• Camera/smart phones
• Mobile Computing/PDA’s
SIMPLIFIED APPLICATIONS DRAWING
SMB112
+3.3V @ 20mA
MCU/RTC
+2.7V to +6.0V
LDO
or
Li-Ion
Inverter
Channel
-0.8V to -10 x Vin (Prog.) @ up to 1A
VGL
Vin to 10 x Vin (Prog.) @ up to 1A
LED Drive
2 Step-Up
(Boost)
I2C/SMBus
Channels
Vin to 10 x Vin (Prog.) @ up to 1A
VGH
System
Control and
Monitoring
Reset Input
Step-Down
(Buck)
Reset Output
Power Good
+0.8V to 0.9 x Vin (Prog.) @ 2A
CONTROLLER
Channels
Figure 1: Applications schematic featuring the SMB112 Five-channel, programmable DC-DC controller
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT Microelectronics, Inc. 2005
Phone 408 436-9890 • FAX 408 436-9897
ht1t7p1:7//FwoxwDwriv.es•uSmanmJoistemCiAc9r5o1.3c1om/
2101 2.4 5/3/2005
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