SMB119
Seven-Channel Programmable DC-DC Power Manager
FEATURES & APPLICATIONS
•
Digital programming of all major parameters via I C interface
and non-volatile memory
o
Output voltage setpoint/margining
o
Sequencing & digital soft start
o
Enable/Disable outputs independently
o
Input/Output UV/OV voltage thresholds
o
PWM/PFM mode
•
Seven programmable regulator channels with 1.5% accuracy
o
Three synchronous step-down (buck) with internal
PFETs
o
Two step-up (boost)
o
One configurable step-up (boost) or step-down (buck)
o
One adjustable output voltage LDO
•
+2.7V to +6.0V Input Range (Higher system voltages supported)
•
Built-in current limiting, UV/OV, and thermal protection
•
Highly accurate reference and output voltage (<1.5%)
•
1MHz PWM frequency and automatic power-saving PFM mode
•
96 bytes of user configurable nonvolatile memory
•
Space-saving 7x7 QFN-48 package
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INTRODUCTION
The SMB119 is a highly integrated and flexible seven-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.
The SMB119 integrates all the essential blocks required to implement
a complete seven-channel power subsystem including three
synchronous step-down “buck” converters, one configurable step-up
“boost” or step-down synchronous “buck” converter, two step-up
(boost) converters, and one linear regulator (LDO).
Additionally sophisticated power control/monitoring functions required
by complex systems are built-in. These include digitally programmable
output voltage setpoint, power-up/down sequencing, enable/disable,
margining, dynamic voltage management, and UV/OV input/output
monitoring on all channels. By incorporating a second ENABLE input
and 7-level dynamic voltage control, the SMB119 is ideal for powering
systems based on Xscale™ and other similar processors.
The integration of features and built-in flexibility of the SMB119 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 SMB119, this facilitates rapid design
cycles and proliferation from a base design to futures generations of
product.
The SMB119 is suited to battery-powered applications with an input
range of +2.7V to +6.0V and provides a very accurate voltage
regulation (<1.5%). Communication is accomplished via the industry
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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 commercial operating temperature range is
0C to +70C, the industrial operating range is –40C to +85C, and the
available package is a 48-pad 7mm x 7mm QFN.
Applications
•
•
•
•
Portable Media Players
Digital camcorders/still cameras
Smart PDA/Camera phones
Handheld GPS/PDAs
•
Portable Equipment
SIMPLIFIED APPLICATIONS DRAWING
SMB119
LDO
+2.7V to +6.0V
DC IN
Vin to +35V (Prog.)
2 Step-Up
Channels
LED
Backlight
TFT-LCD
Bias
+1.5V to +3.75V
MCU/RTC
Vin to +35V (Prog.)
I
2
C/SMBus
Step-Up or
Step-Down
Channel
System
Control
and
Monitoring
+0.5V to +35V (Prog.)
Memory, I/O
System Enable
Pushbutton Power
Shutdown
Control Inputs
Status Outputs
+0.5V to Vin (Prog.)
3 Step-
Down
Channels
CPU Core
+0.5V to Vin (Prog.)
DSP/CODEC
+0.5V to Vin (Prog.)
Analog/RF
Figure 1 – Applications block diagram featuring the SMB119 seven-channel, programmable DC/DC converter. This integrated power
supply provides precision regulation, monitoring, cascade sequencing, and dynamic output voltage management.
© SUMMIT
Microelectronics, Inc. 2006
757 North Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
1
http://www.summitmicro.com/
2126 3.0 10/8/2008
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
