www.leadis.com rev. 1.4 february 12, 2008 lds105p secondary v/i amplifier product specification revision 1.4 february 12, 2008 applications ? offline battery chargers ? constant v/ constant i supplies general description the lds105p is a low cost secondary control circuit for low power applications needing constant volt age and constant current control. it implements a simple single-loop control by modifying the internal reference level as a function of current above the current limit threshold. the current loop reduces the reference by 40 mv per mv change at the current sense input. the error amp provides high gain and bandwidth under low voltage operation. features ? 1.25v reference ? 200mv current limit threshold ? error amp output swings near ground for low voltage operation ? high psrr and line regulation ? low current consumption ? open collector output ? low voltage operation 2.2v ? 10ma current sink ? 50 ppm/oc typical temperature deviation ? rohs compliant available block diagram pin configuration
leadis technology lds105p www.leadis.com 2 rev. 1.4 february 12, 2008 typical application pin descriptions pin pin name function 1 vcc positive supply 2 gnd ground 3 comp output of error amplif ier; 10 ma source/sink capability 4 fb inverting input to error amp lifier; will have threshold of 1.25v. 5 cs current sense input absolute maximum ratings parameter value units v cc voltage 20 v comp voltage 20 v ref voltage 20 v cs voltage (self limiting diodes) 1 v vcc, comp, ref, cs current 50 ma operating junction temperature 150 oc lead temperature (soldering 10 seconds) 260 oc storage temperature range -65 to +150 oc esd rating (hbm) 2 kv
leadis technology lds105p www.leadis.com 3 rev. 1.4 february 12, 2008 electrical specifications electrical characteristics are guaranteed over t he full temperature range ?20oc leadis technology lds105p www.leadis.com 4 rev. 1.4 february 12, 2008 package dimensions sot23-3, sot23-4, sot23-5, sot23-6
leadis technology lds105p www.leadis.com 5 rev. 1.4 february 12, 2008 ordering information device operating tj %tol pkg type v out wrap ordering number lds105p -20c ? 105c ? 1.0 sot-23-5 1.25v t&r LDS105DY-M5-12-TL note: lead free and rohs compliant. warranty and use leadis technology makes no warranty, representation or guaran tee, express or implied, regarding the suitability of its products for any particular purpose, nor that the use of its pr oducts will not infringe its intellectual property rights or the rights of third parties with respect to any particular use or application and specif ically disclaims any and all liability arising out of any such use or application, including but not limited to, consequential or incidental damages. leadis technology products are not designed, intended, or authorized for use as components in systems intended for surgical imp lant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the leadis technology product could c reate a situation where per sonal injury or death may occur. leadis technology reserves the right to make changes to or di scontinue any product or service described herein without notice. products with data sheets labeled "advance information" or "preliminary" and other products described herein may not be in pr oduction or offered for sale. leadis technology advises customers to obtain the current version of the relevant product inform ation before plac ing orders. ci rcuit diagrams illustrate typical semiconductor applications and may not be complete. leadis technology 800 w. california ave, suite 200 sunnyvale, ca 94086 phone: 408.331.8600 document no: lds105p fax: 408.331.8601 revision: 1.4 http:// www.leadis.com issue date: 2/12/08
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