SMB120
Preliminary information
Nine-Channel DC/DC Digitally Programmable System Power Manager
FEATURES & APPLICATIONS
INTRODUCTION
• Digital programming of all major parameters via I2C
The SMB120 is a highly integrated and flexible nine-channel
programmable power manager designed for use in a wide
interface and non-volatile memory
range of portable applications.
The built-in digital
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Output voltage set point
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.
Output power-up/down sequencing
Digital soft-start and output slew rate
Input/battery voltage monitoring
Dynamic Voltage Management
UV/OV monitoring of all outputs
Enable/disable outputs independently
The SMB120 integrates all the essential blocks required to
• Nine output channels
implement
a
complete nine-channel power subsystem
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Four synchronous step-down (buck)
including four synchronous step-down “buck” controllers, three
step-up “boost” controllers, one inverting “buck-boost”
channels
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Three step-up (boost) channels
One inverting (buck-boost) channel
controller, and one linear regulator (LDO).
Additionally
sophisticated power control/monitoring functions required by
One 3.3V fixed LDO channel
complex systems are built-in.
These include digitally
• User friendly Graphical User Interface (GUI)
programmable output voltage set point, power-up/down
sequencing, enable/disable, dynamic voltage management and
UV/OV/input monitoring on all channels.
• 2.7V to 6.0V Input Range
• Highly accurate reference and output voltage (<0.5%)
with Active DC Output Control (ADOC™) technology
• Undervoltage Lockout (UVLO) with hysteresis
• 800 kHz operating frequency (trimmable)
• 96 bytes of user configurable nonvolatile memory
• Eight Phase PWM with Phase Locked Loop (PLL)
• 100% Maximum Duty Cycle for Buck channels
• 0% Duty Cycle option for boost and buck-boost
channels
The integration of features and built-in flexibility of the SMB120
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
SMB120 this facilitates rapid design cycles and proliferation
from a base design to future generations of product.
The SMB120 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 commercial operating temperature range is
0°C to +70°C and the industrial temperature range is –40°C to
+85°C The SMB120 is available in a lead-free, RoHS
compliant 9mm x 9mm 64 pin QFN package.
Applications
• Digital camcorders/still cameras
• Portable DVD/MP3/GPS
• Camera phones
• TFT/LCD Displays/Monitors/TV’s
• Mobile Computing
• Consumer battery-operated equipment
• Intel X-ScaleTM -based consumer devices
•
SIMPLIFIED APPLICATIONS DRAWING
SMB120
+3.3V
LDO
MCU/RTC
+2.7V to +6.0V
Inverter
Channel
-0.8V to -23V(Prog.)
CCD
or
Li-Ion
Vin to +28V (Prog.)
LED Drive
3 Step-Up
(Boost)
Vin to +28V (Prog.)
TFT/LCD
Channels
Vin to +28V (Prog.)
Motor Drive
+0.8V to Vin (Prog.)
CPU Core
I2C/SMBus
+0.8V to Vin (Prog.)
Memory, I/O
System
4 Step-
Down
Control and
Monitoring
(Buck)
Reset Input
+0.8V to Vin (Prog.)
DSP/Codec
Channels
Reset Output
Power Good
+0.8V to Vin (Prog.)
Analog/RF
Figure 1 – Applications schematic featuring the SMB120 Nine-Channel DC-DC Digitally Programmable Power Manager.
This DC/DC controller provides power-on/off control, sequencing, fault monitoring, and Dynamic Voltage Management.
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/
2090 2.3 11/15/2005
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