SMB211 Datasheet, PDF (1/1 Pages) Summit Microelectronics, Inc. – Programmable Power Managers with Digital Power Control

Programmable Power Managers with Digital Power Control
SMB211/212
Preliminary Information
FEATURES & APPLICATIONS
Features
 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
o +0.5V to +2.5V, 10mV steps
o +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 Digital soft-start control
o Power-on delay
o Switching frequency
o PGOOD/RESET/SMB_ALERT output
o Enable/disable control
o Serial-interface slave addresses
o Output voltage
Applications
 Printers
 Digital Set-Top Boxes
 Digital TVs
 Modems
 Datacom/Telecom Equipment
IN^TRO^SeD^rveU^rsCTION
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.
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 [phone] • FAX [phone]
http://www.summitmicro.com/
2139 2.2 1/17/2011
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