SMB214A/B/C
Preliminary Information
High-power, Three-channel Programmable DC-DC System Power Managers
FEATURES & APPLICATIONS
INTRODUCTION
The SMB214A/B/C are highly integrated and flexible three-
channel power managers designed for use in a wide range of
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
• Digital programming of all major parameters via
I2C interface and non-volatile memory
•
•
•
•
•
•
Output voltage set point
Input/battery voltage monitoring
Output power-up/down sequencing
Dynamic voltage control of all outputs
UV/OV monitoring of all outputs
Enable/Disable outputs independently
set-top boxes. Complete with
a user friendly GUI, all
programmable settings, including output voltages and
input/output voltage monitoring, can be customized with ease.
The SMB214A/B/C integrate all the essential blocks required to
implement
a
complete three-channel power subsystem
• User friendly Graphical User Interface (GUI)
• Three synchronous step-down output channels
• Integrated RESET monitor
consisting of three synchronous step-down “buck” controllers.
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 monitoring on all channels.
• +2.7V to +6.0V Input Range
• Highly accurate output voltage: <2.5%
• Factory programmable dead times
• 0% to 100% Duty Cycle operation
The integration of features and built-in flexibility of the
SMB214A/B/C 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 SMB214A/B/C, this facilitates rapid design cycles and
proliferation from a base design to future product generations.
The SMB214A/B/C are suited to a wide variety of applications
with an input range of +2.7V to +6.0V. Higher input voltage
operation can easily be implemented with a small number of
external components. Output voltages are extremely accurate
(<2.5%). Communication is accomplished via the industry
standard I2C bus. All user-programmed settings are stored in
non-volatile EEPROM. The devices are offered in both the
commercial and the industrial operating temperature range.
The package type is a lead-free, RoHS compliant, 5x5 QFN-
32.
• Undervoltage Lockout (UVLO) with hysteresis
• Operating frequency: 400kHz (SMB214A), 800kHz
(SMB214B), 1MHz (SMB214C)
Applications
• Car & Marine Navigation Systems
• Set-top Boxes
• TVs
• DDR Memory
• Mobile Computing/PDAs
• Office Equipment
• DMB Systems
SIMPLIFIED APPLICATIONS DRAWING
+2.7V to +6.0V
SMB214
or
Li-Ion
I2C/SMBus
System
+0.5V to Vin (Prog.) @ 5A
CPU Core
Control
and
3 Step-
Down
Enable Input
Monitoring
+0.5V to Vin (Prog.) @ 5A
Memory, I/O
(Buck)
Channels
RESET
Monitor
+0.5V to Vin (Prog.) @ 5A
Analog/RF
RESET Output
(Power Good)
Figure 1 – Applications schematic featuring the SMB214A/B/C programmable DC-DC controllers.
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT Microelectronics, Inc. 2007
757 N. Mary Avenue • Sunnyvale CA 94085
http://www.summitmicro.com/
2128 2.0 6/20/2008
Phone 408 523-1000 • FAX 408 523-1266
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