SMB137C ? summit microelectronics, inc. 2012 ? 757 n. mary ? sunnyvale ca 94085 ? phone 408 523-1000 ? fax 408 523-1266 http://www.summitmicro.com/ 2156 3.0 4/17/2012 1 programmable switching li+ battery charger with usb/ac input, currentpath? manager, turbochar g e tm mode*, low batter y recover y *, aicl* and usb otg/hdmi/mhl su pp ort introduction features ? automatic input current limit for universal usb/ac/dc adapter compatibility* ? optional automatic power source detection per latest usb charging specification 1.2 ? usb or ac input with automatic input selection and programmable input current limiting (usb2.0 compliant) ? up to 750ma charging output from 500ma usb port or 1500ma from ac adapter using proprietary ?turbocharge tm mode? ? input/output currentpath? control allows system operation with deeply discharged/missing battery ? no start-up delay ? ?low battery recovery? mode for >500ma startup from 100ma usb port with deeply discharged cells ? no start-up delay* ? usb otg, hdmi, mhl power support (up to 500ma @ +5v) ? hardware programmable support for jeita ? high-efficiency step-dow n regulator with 3mhz switching ? +4.35 to +6.0v input voltage range ? +18v input tolerance (non-operating) ? high-accuracy float voltage regulation: 1.0% ? digital programming of major parameters via i 2 c interface* ? comprehensive protection features ? tiny csp-30 package applications ? smartphones ? tablet pcs ? portable media players ? perfect companion for msm chipsets the SMB137C is a programmable single-cell lithium- ion/lithium-polymer battery charger designed for a variety of portable applications. unlike conventional charging devices, the SMB137C?s high-efficiency switch-mode operation eliminates the low charge current and thermal problems of conventional linear solutions. in addition, the switching architecture in conjunction with programmability enables dramatically faster charging ? turbocharge? mode - from current limited inputs such as usb. the SMB137C can switch between usb mode and ac adapter mode and works seamlessly in conjunction with a usb controller. the device can manage two outputs independently: battery charging and system power. this allows immediate system operation even under missing/deeply discharged battery conditions. the SMB137C can also run its switching regulator in reverse to support ?low battery recovery? mode (+4.17v @ 500ma) or usb ?on the go? and hdmi/mhl power (+5.0v @ 500ma). charge control includes input current limit (supporting usb2.0), trickle charge, pre-charge, constant current/constant voltage, float voltage and termi nation/safety settings that are fully programmable via a serial i 2 c/smbus and stored in non- volatile memory making the device truly a flexible solution. the SMB137C also offers a wide variety of features that protect the battery pack as well as the charger and input circuitry: over-current, under/over-voltage, safety timers, charge current/float voltag e compensation and thermal protection. status can be moni tored via the serial port for charge state and fault conditions . in addition, the stat output can be used to signal charge status while the sysok output can be used as a system ok in dicator. operating voltage is specified from +4.35v to +6.0v with +18v non-operating input tolerance. the SMB137C is available in an ultra-compact csp-30 package and is rated over the -30c to +85c temperature range. figure 1 ? system application features & applications handheld device usb2.0 500ma 4.35v-5.5v usb charger up to 1500ma 4.5v-6.0v (18v ovp) i2c (optional) system SMB137C li- ion charging current up to 1500ma usb system output up to 1500ma gnd vb us d- d+ id usb-otg/ hdmi/mhl 5.0v @ 500ma ac/dc adapter up to 1500ma 4.5v-6.0v (18v ovp) otg/lbr/hdmi/mhl 750ma ac/dc input 700-1500ma usb input 100/500/700-1500ma "ideal diode" current total sys. output >1500ma lbr output 4.17v @ 500ma using the SMB137C to charge a single cell li+ battery from usb or ac adapter power sources *patent granted or pending
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