SMB120
Preliminary information
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
1
Nine-Channel DC/DC Digitally Programmable System Power Manager
INTRODUCTION
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 Dynamic Voltage Management
o UV/OV monitoring of all outputs
o Enable/disable outputs independently
Nine output channels
o Four synchronous step-down (buck)
channels
o Three step-up (boost) channels
o One inverting (buck-boost) channel
o One 3.3V fixed LDO channel
User friendly Graphical User Interface (GUI)
2.7V to 6.0V Input Range
Highly accurate reference and output voltage (<0.5%)
with Active DC Output Control (ADOCTM) 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
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-Scale
TM
-based consumer devices
The SMB120 is a highly integrated and flexible nine-channel
programmable 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 SMB120 integrates all the essential blocks required to
implement a complete nine-channel power subsystem
including four synchronous step-down "buck" controllers, three
step-up "boost" controllers, one inverting "buck-boost"
controller, and one linear regulator (LDO). 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, dynamic voltage management and
UV/OV/input monitoring on all 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 ADOCTM technology.
Communication is via the industry standard I
2
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 commercial operating temperature range is
0
C to +70C and the industrial temperature range is 40C to
+85
C The SMB120 is available in a lead-free, RoHS
compliant 9mm x 9mm 64 pin QFN package.
SIMPLIFIED APPLICATIONS DRAWING
FEATURES & APPLICATIONS
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.
SMB120
+0.8V to Vin (Prog.)
+0.8V to Vin (Prog.)
-0.8V to -23V(Prog.)
Vin to +28V (Prog.)
+2.7V to +6.0V
or
Li-Ion
CPU Core
Analog/RF
LED Drive
CCD
+3.3V
MCU/RTC
I2C/SMBus
LDO
4 Step-
Down
(Buck)
Channels
3 Step-Up
(Boost)
Channels
Inverter
Channel
System
Control and
Monitoring
Reset Output
Power Good
Reset Input
Vin to +28V (Prog.)
TFT/LCD
Vin to +28V (Prog.)
Motor Drive
+0.8V to Vin (Prog.)
Memory, I/O
+0.8V to Vin (Prog.)
DSP/Codec
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