SMB122 advanced specification 1 (see last page) ? 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 nine-channel programmable dc-dc powe r manager with battery charger introduction ? digital programming of all major parameters via i 2 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 applications ? portable media players ? digital camcorders/still cameras ? smart pda/camera phones ? handheld gps/pda?s ? tft-lcd displays/monitors/tv?s the SMB122 is a highly integrat ed and flexible nine-channel power manager designed for use in a wide range of portable applications. the built-in digital programmability a llows 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 ess ential blocks required to implement a complete nine-channel power subsystem including three synchronous step-down ?buck? c onverters, one configurable step-up ?boost? or step-down synchronous ?buck? converter, two step-up (boost) converters, one configurable step-up ?boost? or inverting step- up/down ?buck-boost? converter, one linear regulator (ldo) and a fully programmable li-ion battery charger . additionally sophisticated power control/monitoring functi ons required by complex systems are built-in. these include digitally programmable output voltage setpoint, power- up/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 regulation (<1.5%). communicati on is via the industry standard i 2 c bus. all user-programmed settings ar e 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. sm b122 +0.5v to v in (p ro g .) l i-io n b attery or +2.7v to +6.0v analog/rf +1.5v to +3.75v mcu/rtc i 2 c/smbus ldo 3 step- down channels system control and m onitoring status outputs shutdown +0.5v to + 35v (p ro g .) memory, i/o +0.5v to v in (p ro g .) cpu core +0.5v to v in (p ro g .) dsp/codec step-up or step-down channel li-ion charger +4.5v to +6.0v dc in control inputs pushbutton power -35v to +35v (prog.) tft-lcd/ ccd sensor step-up or inverting channel 2 step-up channels v in to +35v (p ro g .) led backlight v in to +35v (p ro g .) tft-lcd bias figure 1 ? applications block diagram featuring the SMB122 eight-channel, programmable dc/dc converter. this integrated power supply and battery manage r provides precision regulation, monitoring, cascade sequencing, output margining and battery charging. simplified applications drawing features & applications
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