SMB122
Advanced Specification
1
(See Last Page)
Nine-Channel Programmable DC-DC Power Manager with Battery Charger
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, switching frequency
•
Eight programmable regulator channels with 1.5% accuracy
o
Three synchronous step-down (buck) with
internal PFETs
o
One configurable step-up (boost) or
synchronous step-down (buck)
o
Two step-up (boost)
o
One configurable step-up (boost) or inverting
step-up/down (buck-boost)
o
One adjustable output voltage LDO
•
Programmable Linear Li-Ion Battery Charger
o
Precharge/fast charge/termination current
o
Fast Charge voltage threshold
o
Float Voltage (<0.5% accuracy)
•
+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%)
•
500 to 1000kHz PWM frequency and automatic power-saving
PFM mode
•
96 bytes of user configurable nonvolatile memory
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INTRODUCTION
The SMB122 is a highly integrated and flexible nine-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 SMB122 integrates all the essential blocks required to implement
a complete nine-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, one configurable step-up “boost” or inverting step-
up/down “buck-boost” converter, one linear regulator (LDO) and a fully
programmable Li-Ion battery charger. 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 and UV/OV
input/output monitoring on all channels.
The integration of features and built-in flexibility of the SMB122 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 SMB122 this facilitates rapid design
cycles and proliferation from a base design to futures generations of
product.
The SMB122 is suited to battery-powered applications with an input
range of +2.7V to +6.0V and provides a very accurate voltage
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regulation (<1.5%). 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 commercial operating temperature range is 0C to
+70C, the industrial operating range is –40C to +85C, and the
available package is a 64-pad 9mm x 9mm QFN.
Applications
•
•
•
•
Portable Media Players
Digital camcorders/still cameras
Smart PDA/Camera phones
Handheld GPS/PDA’s
•
TFT-LCD Displays/Monitors/TV’s
SIMPLIFIED APPLICATIONS DRAWING
SM B122
+ 4 .5 V to + 6 .0 V
D C IN
LDO
L i-Io n
C h a rg e r
S te p -U p o r
In v e r tin g
Channel
L i-Io n B a tte r y
or
+ 2 .7 V to + 6 .0 V
-3 5 V to + 3 5 V (P r o g .)
T F T -L C D /
CCD Sensor
+ 1 .5 V to + 3 .7 5 V
M C U /R T C
V in to + 3 5 V (P r o g .)
2 S te p -U p
C h a n n e ls
V in to + 3 5 V (P r o g .)
LED
B a c k lig h t
T F T -L C D
B ia s
I
2
C /S M B u s
S te p -U p o r
S te p -D o w n
Channel
S ys te m
C o n tro l
and
M o n ito r in g
+ 0 .5 V to + 3 5 V (P r o g .)
M e m o r y , I/O
+ 0 .5 V to V in (P r o g .)
3 S te p -
Down
C h a n n e ls
P u s h b u tto n P o w e r
S h u td o w n
C o n tr o l In p u ts
S ta tu s O u tp u ts
C P U C o re
+ 0 .5 V to V in (P r o g .)
D S P /C O D E C
+ 0 .5 V to V in (P r o g .)
A n a lo g /R F
Figure 1 – Applications block diagram featuring the SMB122 eight-channel, programmable DC/DC converter.
This integrated power supply and battery manager provides precision regulation, monitoring, cascade
sequencing, output margining and battery charging.
© SUMMIT
Microelectronics, Inc. 2005
1717 Fox Drive • San Jose CA 95131 • Phone 408 436-9890 • FAX 408 436-9897
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1.2 11/11/2005
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
