SMB138/a/c ? summit microelectronics, inc. 2004 ? 757 n. mary avenue ? sunnyvale ca 94085 ? phone 408 523-1000 ? fax 408 523-1266 http://www.summitmicro.com/ 3.0 4/5/2008 1 programmable switch-mode, usb/ac input li+ battery charger with turbocharge? mode and usb ?on- the-go? power confidential do not copy introduction ? usb or ac input with programmable input current limiting ? up to 1.25a continuous charging current from ac adapter ? up to 750ma charging current from 500ma usb port using automatic turbocharge? mode ? +4.35 to +6.2v input voltage range (+16v tolerant) ? two product options: o SMB138a: charger off until i 2 c command initiation, enable/disable control via i 2 c o SMB138c: charger powers up in charging mode, enable/disable control via i 2 c ? usb ?on-the-go? power support for usb otg enabled devices (+5v reverse output @ 200ma) ? reverse current blocking (<5ua) ? high-efficiency 3mhz voltage-mode step-down regulator ? integrated frequency compensation ? internal power mosfets and precision current sensing ? high-accuracy float voltage regulation: 1% ? thermal regulation (current foldback) ? trickle charging ? pre-charge and complete-charge (36/240min) safety timers ? digital programming of all major parameters via i 2 c interface o fast charge voltage threshold, float voltage o pre-charge, fast charge, termination current ? status register monitors and flags charger operation o charge in-progress/termination o charge timer fault o oc/uv/ov detection/shutdown ? ucsp-19 lead-free package (0.4mm ball pitch) applications ? 2.5/3/3g+ gsm/cdma/wcdma phones ? smartphones/pdas ? portable media players ? portable gps terminals the SMB138 is a programmable singl e-cell lithium-ion/lithium-polymer battery charger designed for a variet y of portable applications. the device provides a simple and effici ent way to charge high-capacity li- ion batteries via a usb or ac adapter input. unlike conventional devices, the SMB138?s high-efficiency, switch-mode operation eliminates the thermal problems of c onventional linear solutions. also the buck converter architecture effectively multiplies the input current to increase charge rate for the li+ cell and uses current limited supplies like usb more efficiently. the SMB138 also supports usb on-the-go devices by providing the required usb-otg +5v power supply using the li-ion battery as a source. the SMB138 can switch between usb mode and ac adapter mode and works seamlessly in conjunction with a usb controller. charge control includes qualification, tri ckle-charge, pre-charge, constant current/constant voltage, float voltage and termination/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. fast charge current level can be set via i 2 c (limited in usb mode to ensure 100ma or 500ma input). built-in is reverse-current blocking to prevent inadvertent cell discharge. high frequency operation and integrated power fets contribute to reduced external component count and size. the SMB138a device requires a user i 2 c command for charging initiation, whereas the SMB138c device powers up in the charging mode. the SMB138c offers the option to automatically charge the battery only when the battery voltage is below a selectable ?dead- battery? threshold. the SMB138 also offers several features that protect the battery pack as well as the charger and input ci rcuitry: over-current, under/over- voltage and thermal protection. ultra-accurate, 1% battery float voltage control improves battery capacity utilization. the stat output is an interrupt to flag various status/flag events (programmable selection) and the status register can be read via the serial port. the SMB138 is available in an ultra- compact lead-free ucsp-19 package and is rated over the ?30c to +85c temperature range. system application features & applications handheld system usb usb usb 500ma 4.35v-5.5v ac/dc 300-1800ma 4.5v-6.2v i2c system SMB138 li-ion charging usb total output 550-1250ma to system gnd vb us d- d+ nc usb-otg output 500ma figure 1 ? using the SMB138 to charge a single cell li+ battery from usb or ac adapter power sources
SMB138/a/c summit microelectronics, inc 3.0 4/5/2008 2 138vss 01ayww ball a1 identifier summit part number date code (yww) drawing not to scale x is the sequential number per wafer (1 for first wafer, 2 for second wafer, etc.) multiple lot disignator status tracking code (summit use) lead-free SMB138 e package e = 19-ball ultra csp tm summit part-number specific requirements are contained in the suffix nnn part number suffix y lead free a blank = see csir a = power-off until i2c command c = power-up in charge mode notice summit microelectronics, inc. reserves the right to make change s to the products contained in this publication in order to improve design, performance or reliability. summit micr oelectronics, inc. assumes no re sponsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and sc hedules contained herein reflect representative operating parameters, and may vary depending upon a user?s specific ap plication. while the information in this publication has been carefully checked, summit microelectr onics, inc. shall not be liable for any damages arising as a result of any error or omission. summit microelectronics, inc. does not recommend the use of any of its products in life support or aviation applications where the failure or malfunction of the product can reasonably be expected to cause any failure of either system or to significantly affect their safety or effectiveness. products are not authoriz ed for use in such applications unless summit microelectronics, inc. receives written assurances, to it s satisfaction, that: (a) the ri sk of injury or damage has been minimized; (b) the user assumes all such risks; and (c ) potential liability of summit microelectronics, inc. is adequately protected under the circumstances. revision 3.0 - this document supersedes all previous vers ions. please check the summit microelectronics inc. web site at www.summitmicro.com for data sheet updates. ? copyright 2006 summit microelectronics, inc. programmable power for a green planet? i 2 c is a trademark of philips corporation part marking ordering information
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