SMB211/212
Preliminary Information
Programmable Power Managers with Digital Power Control
FEATURES & APPLICATIONS
Features
Servers
INTRODUCTION
Digital Power Control via 2-wire serial interface and non-
volatile memory
Current-mode control
Input voltage range: +4.5V to +13.5V
More than 15A output current
Output voltage accuracy:
1.0%
Static or dynamically programmable output voltage
The SMB211/212 are highly integrated and flexible power manager
designed for use in a wide range of applications from printers and set-
top boxes to servers and network equipment. The built-in non-volatile
digital programmability allows system designers to custom tailor the
device to suit almost any power supply application.
The SMB211/212 feature a synchronous high current step-down “buck”
controller that can provide an output current of more than 15A. They
can operate with an input voltage of +4.5V to +13.5V and provide
programmable output voltages that are typically accurate to 1.0%. The
SMB211 is available with a switching frequency of 250, 500, 750 and
1000kHz, while the SMB212 is available with a switching frequency of
250, 375, 500 and 625kHz.
Additional sophisticated power control/monitoring functions required by
complex systems are built-in and programmed via an industry-standard
2-wire serial interface. These include digitally programmable output
voltage set-point and margining, power-on delay, soft-start, switching
frequency and UV/OV output voltage monitoring.
The integration of features and built-in flexibility of the SMB211/212
allows the system designer to create a “platform solution” that can be
easily modified via software without major hardware changes. This
facilitates rapid design cycles and proliferation from a base design to
future generations of product.
Communication is accomplished via an industry standard 2-wire serial
bus. All non-volatile programmed settings are stored in non-volatile
memory and reset during power-up. The operating temperature range
is –30C to +85C and the available package is a 3mm x 3mm QFN-20.
o
o
+0.5V to +2.5V, 10mV steps
+1V to +5.0V, 20mV steps
Cycle-by-cycle current limit
Output voltage margining
Output UV/OV monitoring
Internal over-temperature protection
PWM or PFM operation
Programmable system power control
o
o
o
o
o
o
o
Digital soft-start control
Power-on delay
Switching frequency
PGOOD/RESET/SMB_ALERT output
Enable/disable control
Serial-interface slave addresses
Output voltage
Applications
Printers
Digital Set-Top Boxes
Digital TVs
Modems
Datacom/Telecom Equipment
SYSTEM APPLICATION
+4.5V to +13.5V
VIN
SMB211/212
I2C/SMBus
(PMBus)
EN/Control Input
Status/Alert Outputs
System
Control
and
Monitoring
Step-Down
ext. FET
0.5V-5V (Prog.)
20A+
ASIC/CPU/
SoC
Figure 1
– Typical SMB211/212 System Diagram
© SUMMIT
Microelectronics, Inc. 2008
• 757 N. Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com/
2139
2.2 1/17/2011
1
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
