SMB122 Datasheet, PDF (1/1 Pages) Summit Microelectronics, Inc. – Nine-Channel Programmable DC-DC Power Manager with Battery Charger

SMB122
Advanced Specification¹ (See Last Page)
Nine-Channel Programmable DC-DC Power Manager with Battery Charger
FEATURES & APPLICATIONS
INTRODUCTION
• Digital programming of all major parameters via I²C 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 I²C
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.
SIMPLIFIED APPLICATIONS DRAWING
+4.5V to +6.0V
D C IN
SM B122
L i-Io n
C harger
LDO
S tep -U p o r
In v e rtin g
Channel
L i-Io n B a tte ry
or
+2.7V to +6.0V
2 S tep -U p
C h an n els
+ 1 .5 V to + 3 .7 5 V
-3 5 V to + 3 5 V (P ro g .)
V in to + 3 5 V (P ro g .)
V in to + 3 5 V (P ro g .)
M C U /R TC
T F T -L C D /
CCD Sensor
LED
B a c k lig h t
TF T -L C D
B ia s
I²C /S M B u s
P u sh b u tto n P o w er
S h u td o w n
C o n tro l In p u ts
S tatu s O u tp u ts
S ys tem
C o n tro l
and
M o n ito rin g
S tep -U p o r
S tep -D o w n
Channel
3 S tep -
Dow n
C h an n els
+ 0 .5 V to + 3 5 V (P ro g .)
+ 0 .5 V to V in (P ro g .)
+ 0 .5 V to V in (P ro g .)
+ 0 .5 V to V in (P ro g .)
M e m o ry, I/O
C P U C ore
D S P /C O D E C
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 [phone] • FAX [phone]
1
http://www.summitmicro.com/
1.2 11/11/2005