SMB122
Advanced Specification
1
(See Last Page)
SUMMIT Microelectronics, Inc. 2005
1717 Fox Drive San Jose CA 95131 Phone 408 436-9890 FAX 408 436-9897
1
http://www.summitmicro.com/
1.2 11/11/2005
Nine-Channel Programmable DC-DC Power Manager with Battery Charger
INTRODUCTION
Digital programming of all major parameters via I
2
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
Applications
Portable Media Players
Digital camcorders/still cameras
Smart PDA/Camera phones
Handheld GPS/PDA's
TFT-LCD Displays/Monitors/TV's
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
regulation (<1.5%). 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 0C to
+70C, the industrial operating range is 40C to +85C, and the
available package is a 64-pad 9mm x 9mm QFN.
S M B 1 2 2
+ 0 . 5 V t o V i n ( P r o g . )
L i - I o n B a t t e r y
o r
+ 2 . 7 V t o + 6 . 0 V
A n a l o g / R F
+ 1 . 5 V t o + 3 . 7 5 V
M C U / R T C
I
2
C / S M B u s
L D O
3 S t e p -
D o w n
C h a n n e l s
S y s t e m
C o n t r o l
a n d
M o n i t o r i n g
S t a t u s O u t p u t s
S h u t d o w n
+ 0 . 5 V t o + 3 5 V ( P r o g . )
M e m o r y , I / O
+ 0 . 5 V t o V i n ( P r o g . )
C P U C o r e
+ 0 . 5 V t o V i n ( P r o g . )
D S P / C O D E C
S t e p - U p o r
S t e p - D o w n
C h a n n e l
L i - I o n
C h a r g e r
+ 4 . 5 V t o + 6 . 0 V
D C I N
C o n t r o l I n p u t s
P u s h b u t t o n P o w e r
- 3 5 V t o + 3 5 V ( P r o g . )
T F T - L C D /
C C D S e n s o r
S t e p - U p o r
I n v e r t i n g
C h a n n e l
2 S t e p - U p
C h a n n e l s
V i n t o + 3 5 V ( P r o g . )
L E D
B a c k l i g h t
V i n t o + 3 5 V ( P r o g . )
T F T - L C D
B i a s
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.
SIMPLIFIED APPLICATIONS DRAWING
FEATURES & APPLICATIONS
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