SMB111
Four Channel Programmable DC-DC System Power Manager
FEATURES & APPLICATIONS
•
Digital programming of all major parameters via I
2
C
interface and non-volatile memory
o
Output voltage set point
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
•
Four output channels
o
Three synchronous step-down (buck)
channels
o
One step-up (boost) channel
•
User friendly Graphical User Interface (GUI)
•
+2.7V to +6.0V Input range
•
Highly accurate output voltage (<0.5%) with Active DC
Output Control (ADOC™) technology
•
Undervoltage Lockout (UVLO) with hysteresis
•
800 kHz operating frequency
•
96 bytes of user configurable nonvolatile memory
Applications
•
Digital camcorders/still cameras
•
Portable DVD/MP3/GPS
•
Camera/smart phones
•
TFT/LCD Displays/Monitors/TV’s
•
Mobile Computing/PDA’s
•
Consumer battery-operated equipment
Preliminary Information
INTRODUCTION
The SMB111 is a highly integrated and flexible four-channel
power manager designed for use in a wide range of portable
applications. 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. Complete with a user friendly GUI, all
programmable settings including output voltages and
input/output voltage monitoring can be customized with ease.
The SMB111 integrates all the essential blocks required to
implement a complete four-channel power subsystem including
three synchronous step-down “buck” controllers and one step-
up “boost” controller. Additionally sophisticated power
control/monitoring functions required by complex systems are
built-in. These include digitally programmable output voltage
set point, 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 SMB111
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
SMB111 this facilitates rapid design cycles and proliferation
from a base design to future generations of product.
The SMB111 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.
2
Communication is via the industry standard I C 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.
SIMPLIFIED APPLICATIONS DRAWING
SMB111
+2.7V to +6.0V
or
Li-Ion
Step-Up
(Boost)
Channel
Vin to +30V (Prog.) @ UP TO 1A
LED Drive
I2C/SMBus
+0.8V to 0.9 x Vin (Prog.) @ 2A
System
Control and
Monitoring
3 Step-
Down
(Buck)
Channels
CPU Core
+0.8V to 0.9 x Vin (Prog.) @ 2A
Reset Input
Reset Output
Power Good
Memory, I/O
+0.8V to 0.9 x Vin (Prog.) @ 2A
DSP/Codec
Figure 1: Applications schematic featuring the SMB111 four-channel, programmable DC-DC controller
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT
Microelectronics, Inc. 2005
1717 Fox Drive • San Jose CA 95131
Phone 408 436-9890 • FAX 408 436-9897
http://www.summitmicro.com/
2100 2.3 5/3/2005
1
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