SMB118
Advanced Datasheet
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/
0.4 10/7/2005
Seven-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
Six 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 One step-up (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 (<1% 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 power saving automatic
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 SMB118 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 SMB118 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, one step-up
"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 SMB118 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 SMB118 this facilitates rapid design
cycles and proliferation from a base design to futures generations of
product.
The SMB118 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 48-pad 7mm x 7mm QFN.
Figure 1 Applications block diagram featuring the SMB118 six-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
SMB118
+0.5V to Vin (Prog.)
Li-Ion Battery
or
+2.7V to +6.0V
Analog/RF
I2C/SMBus
3 Step-
Down
(Buck)
Channels
Step-Up
(Boost)
Channel
System
Control and
Monitoring
5 Status Outputs
Shutdown
+0.5V to +35V (Prog.)
Memory, I/O
+0.5V to Vin (Prog.)
CPU Core
+0.5V to Vin (Prog.)
DSP/CODEC
Step-Up
(Boost) or
Step-Down
(Buck)
Channel
Li-Ion
Charger
+4.5V to +6.0V
DC IN
Pushbutton Power
+0.5V to +35V (Prog.)
LED Backlight
Drive
LDO
Channel
+1.5V to +3.75V (Prog.)
MCU/RTC
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