SMB109 - Summit Microelectronics - #1

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SMB109 Preliminary 1 (See Last Page) © SUMMIT Microelectronics, Inc. 2011 • 757 N. Mary Ave. • Sunnyvale CA 94085 • Phone 408 531-1000 • FAX 408 523-1266 http://www.summitmicro.com/ 2148 1/27/2011 1 Multi-Output SMBus/I2C Programmable Power Managers with Digital Power Control Features „h Four main outputs plus four load switch outputs „h Digital Power Control via SMBus/I2C interface - programmable parameters with non-volatile memory „h +4.5V to +28V input „h VDDQ and Tracking VTT Mode for DDR Memory Applications „h Three Programmable Buck Outputs o Static or dynamically programmable output voltage „X +0.500V to +2.500V, 9.80mV steps „X +2.500 to +5.000V, 19.60mV steps o Integrated FET Drivers for 20A+ or 7.5A+ outputs o Programmable output current limit o Programmable source/sink mode with Vtt tracking o Programmable UV/OV monitoring o 300-1200kHz programmable switching frequency o Phase interleaving (120o) o PWM or PFM operation o <1% typical output voltage accuracy „h LDO controller o Up to 5A output with typical external NFET „h Programmable system power control o Cascade output sequencing/tracking for all outputs with up to 15 timing delay positions o External NFET load switch sequencing/tracking with built-in +10V charge pump drive o Digital soft-start/stop control o PGOOD/RESET output with programmable delay „h Digital input current/voltage sensing and reporting Applications „h Notebook/Desktop/Handheld Computers „h Digital TV/Set-Top Box/PVR/DVR „h Datacom/Telecom Equipment „h Servers The SMB109 is a highly integrated and flexible quad/octal output power manager designed for use in a wide range of applications from notebook computers 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 multioutput power supply application. The SMB109 integrates all the essential blocks required to implement a complete four to eight output power subsystem with synchronous high current step-down “buck” converters. Also the SMB109 includes an LDO controller for lower current applications. External sequencing/tracking FET control allows for supporting up to eight total outputs form the four main converters. Source and sink capability with VDDQ/VTT tracking is built into the switchers to support DDR termination applications. The SMB109 has a wide input range of +4.5V to +28V and output voltages are typically accurate to <1%. Additionally sophisticated power control/monitoring functions required by complex systems are built-in and programmed via the industrystandard I2C/SMBus. These include digitally programmable output voltage setpoint/margining, power-up/down, input current/voltage sensing, sequencing/tracking, switching frequency/interleave and UV/OV input/output voltage monitoring on all channels. The integration of features and built-in flexibility of the SMB109 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 SMB109, this facilitates rapid design cycles and proliferation from a base design to futures generations of product. Communication is via the industry standard SMBus/I2C bus. All nonvolatile programmed settings are stored in OTP memory and reset on power-up. The operating temperature range is 0C to +85C and the available package is a 7mm X 7mm QFN-56. Chipset/ASIC DDR RAM AGP Gfx SMB109 I2C/SMBus Step-Down 1 ext. FET System Control and Monitoring Status Outputs Control Inputs 0.5V-5V (Prog.) 20A+ DDR VDD +4.5V to +28V VIN Step-Down 2 ext. FET 0.5V-5V (Prog.) 20A+ GPU Step-Down 0 ext. FET 0.5V-5V (Prog.) 20A+ DDR VTT LDO ext. FET 0.5V-5V (Prog.) 5A+ Gfx DDR Input Power Monitor I/O Core Load Switch Controller 0 Gfx VTT Load Switch Controller 1 Load Switch Controller 2 Load Switch Controller 3 Memory/IF Figure 1 – SMB109 applications block diagram featuring multiple outputs and power control SYSTEM APPLICATION FEATURES & APPLICATIONS INTRODUCTION