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| SMB122 Advanced Specification1 (See Last Page) Nine-Channel Programmable DC-DC Power Manager with Battery Charger FEATURES & APPLICATIONS * Digital programming of all major parameters via I 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 * Eight 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 Two step-up (boost) o One configurable step-up (boost) or inverting step-up/down (buck-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 (<0.5% 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 automatic power-saving PFM mode * 96 bytes of user configurable nonvolatile memory 2 INTRODUCTION The SMB122 is a highly integrated and flexible nine-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 SMB122 integrates all the essential blocks required to implement a complete nine-channel power subsystem including three synchronous step-down "buck" converters, one configurable step-up "boost" or step-down synchronous "buck" converter, two step-up (boost) converters, one configurable step-up "boost" or inverting stepup/down "buck-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, powerup/down sequencing, enable/disable, margining and UV/OV input/output monitoring on all channels. The integration of features and built-in flexibility of the SMB122 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 SMB122 this facilitates rapid design cycles and proliferation from a base design to futures generations of product. The SMB122 is suited to battery-powered applications with an input range of +2.7V to +6.0V and provides a very accurate voltage 2 regulation (<1.5%). Communication is via the industry standard I 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 64-pad 9mm x 9mm QFN. Applications * * * * Portable Media Players Digital camcorders/still cameras Smart PDA/Camera phones Handheld GPS/PDA's * TFT-LCD Displays/Monitors/TV's SIMPLIFIED APPLICATIONS DRAWING SM B122 + 4 .5 V to + 6 .0 V D C IN LDO L i-Io n C h a rg e r S te p -U p o r In v e r tin g Channel L i-Io n B a tte r y or + 2 .7 V to + 6 .0 V -3 5 V to + 3 5 V (P r o g .) T F T -L C D / CCD Sensor + 1 .5 V to + 3 .7 5 V M C U /R T C V in to + 3 5 V (P r o g .) 2 S te p -U p C h a n n e ls V in to + 3 5 V (P r o g .) LED B a c k lig h t T F T -L C D B ia s I2 C /S M B u s S te p -U p o r S te p -D o w n Channel S ys te m C o n tro l and M o n ito r in g + 0 .5 V to + 3 5 V (P r o g .) M e m o r y , I/O + 0 .5 V to V in (P r o g .) 3 S te p Down C h a n n e ls P u s h b u tto n P o w e r S h u td o w n C o n tr o l In p u ts S ta tu s O u tp u ts C P U C o re + 0 .5 V to V in (P r o g .) D S P /C O D E C + 0 .5 V to V in (P r o g .) A n a lo g /R F Figure 1 - Applications block diagram featuring the SMB122 eight-channel, programmable DC/DC converter. This integrated power supply and battery manager provides precision regulation, monitoring, cascade sequencing, output margining and battery charging. (c) SUMMIT Microelectronics, Inc. 2005 1717 Fox Drive * San Jose CA 95131 * Phone 408 436-9890 * FAX 408 436-9897 1 http://www.summitmicro.com/ 1.2 11/11/2005 |
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