SMB211/212 Preliminary Information Programmable Power Managers with Digital Power Control Servers INTRODUCTION FEATURES & APPLICATIONS Features Digital Power Control via 2-wire serial interface and nonvolatile 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 o The SMB211/212 are highly integrated and flexible power manager designed for use in a wide range of applications from printers and settop 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. +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 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. Digital soft-start control Power-on delay Switching frequency PGOOD/RESET/SMB_ALERT output Enable/disable control Serial-interface slave addresses Output voltage 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. Applications Printers Digital Set-Top Boxes Digital TVs Modems Datacom/Telecom Equipment 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 I2C/SMBus (PMBus) EN/Control Input SMB211/212 Step-Down ext. FET System Control and Monitoring 0.5V-5V (Prog.) 20A+ ASIC/CPU/ SoC Status/Alert Outputs 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