www.leadis.com 1 lds431lp lds431lp 1.24v shunt ref/amplifier to-92 and sot23 package product specification revision 1.6 february 01, 2008 applications ? power supply control loop ? low tc low voltage reference ? power management applications general description the lds431l is a low voltage reference/ amplifier suited for the control loop of low voltage power supplies. functionally similar to the ubiquitous tl431, the lds431l has a lower 1.24v reference and a much wider range of operating currents. particular care was taken in the design to minimize overshoot at startup and to allow wide ac bandwidth. the lds431lp is a drop-in replacement for any 1.24v shunt reference. features ? low voltage reference: 1.24v ? 40 ua to 100 ma operation ? drop-in replaces any 1.24v shunt reference ? low tc voltage reference ? improved ac, dc performance compared to tlv431, 432 part types ? rohs compliant pin configuration pin descriptions pin name function cath output and supply terminal, must be greater than 1.2v for normal operation ref input, nominally 1.24v in normal operation. anode ground and substrate
leadis technology inc. lds431lp www.leadis.com 2 rev. 1.6 february 01, 2008 absolute maximum ratings stress greater than those listed under ?absolute ma ximum ratings? may cause permanent damage to the device. these stress ratings only, and functional opera tion of the device at these or any conditions beyond those indicated under recommended operating conditions is not implied. exposure to ?absolute maximum rating? for extended periods may affect device reliab ility. use of standard esd handling precautions is required. parameter value units cath voltage 18 v ref current 3 ma cath, anode currents 150 ma operating junction temperature 150 oc lead temperature (soldering 10 seconds) 260 oc storage temperature range -65 to +150 oc electrical specifications electrical characteristics are guaranteed over the full temperature range ?40oc leadis technology inc. lds431lp www.leadis.com 3 rev. 1.6 february 01, 2008 typical performance characteristics reference voltage vs junction temperature 1.232 1.234 1.236 1.238 1.24 1.242 1.244 1.246 -50 -25 0 25 50 75 100 125 150 junction temperature (degrees c) reference voltage (v) reference input current vs junction temperature 150 160 170 180 190 200 210 220 230 240 250 -50 -25 0 25 50 75 100 125 150 junction temperature (degrees c) reference input current (na) cathode current vs cathode voltage -100 -50 0 50 100 150 -1 -0.5 0 0.5 1 1.5 cathode voltage (v) cathode current (ma) cathode current vs cathode voltage -10 0 10 20 30 40 50 00.511.5 cathode voltage (v) cathode current (ua)
leadis technology inc. lds431lp www.leadis.com 4 rev. 1.6 february 01, 2008 typical performance characteristics (contd.) off-state cathode current vs junction temperature 0 10 20 30 40 50 60 70 80 -50 -25 0 25 50 75 100 125 150 junction temperature (degrees c) off-state cathode current (na) delta reference voltage per delta cathode voltage vs junction temperature -0.18 -0.16 -0.14 -0.12 -0.1 -0.08 -0.06 -0.04 -0.02 0 -50 -25 0 25 50 75 100 125 150 junction temperature (degrees c) delta reference voltage per delta cathod e voltage (mv/v) open lop voltage gain vs frequency -20 0 20 40 60 80 100 0.001 0.01 0.1 1 10 100 1000 frequency (khz) open loop voltage gain (db) dynamic impedance vs frequency 0.1 1 10 100 0.1 1 10 100 1000 10000 frequency (khz) dynamic impedance (0hms)
leadis technology inc. lds431lp www.leadis.com 5 rev. 1.6 february 01, 2008 package dimensions sot23-3, sot23-4, sot23-5, sot23-6
leadis technology inc. lds431lp www.leadis.com 6 rev. 1.6 february 01, 2008 package dimensions to92-2, to92-3
leadis technology inc. lds431lp www.leadis.com 7 rev. 1.6 february 01, 2008 ordering information device operating tj %tol pkg type v out wrap ordering number lds431lp -40c ? 105c ? 1.0 to-92-3 1.24v t&r LDS431LBY-N3-12-TL lds431lp -40c ? 105c ? 0.5 to-92-3 1.24v t&r lds431lbz-n3-12-tl lds431lp -40c ? 105c ? 1.0 sot-23-3 1.24v t&r lds431lby-m3-12-tl lds431lp -40c ? 105c ? 0.5 sot-23-3 1.24v t&r lds431lbz-m3-12-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 specifically 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 personal 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 information bef ore placing orders. ci rcuit diagrams illustrate typical semiconductor applicat ions and may not be complete. 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 specifically 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 personal 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 information before placing orders. circuit 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: 431lds fax: 408.331.8601 revision: 1.6 http:// www.leadis.com issue date: 2/01/08
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