1 dc1587f demo manual dc1587 description LTC3105EDD: step-up dc/dc converter with power point control and ldo regulator demonstration circuit 1587a is a boost converter op- timized for relatively high impedance, very low voltage input power sources. it allows a user to quickly evaluate the ltc3105 boost converter and ldo regulator. capable of operating with an input voltage as low as 250mv and as high as 5v, the circuit features maximum power point control (mppc). jumpers on the circuit board allow the user to select several mppc voltages, three boost output voltages and three ldo regulator output voltages. also included are jumpers for shutdown and for selecting an external pull-up voltage for the power good status output. terminals are provided for input and output connections, l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. parameter condition value start-up input voltage no load, r mppc = 22k, supply esr = 0.5, see section 3 250mv typical input voltage range after start-up 0.2v to 5v maximum boost output current v in = 2v, v out = 5v, mppc = 2v, resistive load 125ma 1.8v boost output voltage v in = 1.5v, 100 load 1.8v 3% 3.3v boost output voltage v in = 1.5v, 100 load 3.3v 3% 5v boost output voltage v in = 1.5v, 100 load 5v 3% 1.5v ldo output voltage v in = 1.5v, 500 load 1.5v 3% 2.2v ldo output voltage v in = 1.5v, 500 load 2.2v 2% 3v ldo output voltage v in = 1.5v, 500 load 3v 3% performance summary (t a = 25c) power good output and external power good supply input, shutdown input, and provisions for external mppc resistor and mppc diode input. this demonstration board is especially designed for low power solar cell applications. the ltc3105 data sheet gives a complete description of the part, operation and application information. the data sheet must be read in conjunction with this demo manual. design ? les for this circuit board are available at http://www.linear.com/demo quick start procedure equipment required to evaluate the ltc3105 demonstration circuit include a low voltage bench power supply, digital voltmeters and suitable load resistors. refer to figure 1 for proper measurement equipment setup and follow the procedure below. 1. begin by placing jumpers in the following positions. jp4 pgood jp1 boost jp3 ldo jp2 mppc jp5 shdn vpgood 5v 3v 0.4v off
2 dc1587f demo manual dc1587 quick start procedure 2. with the power off, connect a low voltage adjustable power supply and three voltmeters as shown in figure?1 (ammeters are optional). switch the power supply on and adjust the voltage to approximately 450mv, and move the jp5 jumper to the on position. with no load resistor on either output, verify that the boost and ldo output voltages are within the speci? cations shown in table 1. increase the input voltage to 1.5v and connect suitable load resistors to the output terminals to verify the output voltages under load. the maximum boost output current is dependant on v in and the maximum ldo output current is 6ma maximum power point control (mppc) prevents the converter from pulling the input supply voltage down below a preset voltage level when the maximum input supply current is reached. the converter does this by dynamically reducing the converters output voltage and current as the input voltage begins to drop due to the input power source current limitations. without mppc, a converter would pull the input power source down to near 0v, resulting in near zero output power. mppc is especially useful with power sources that have relatively high or variable source impedances such as solar cells and other energy harvesting devices. the following exercise is to illustrate the mppc function. to demonstrate the mppc function, place a 10, 1w resistor in series with the demo board input terminal (v in ) to simulate a high impedance power source. move jumper jp2 (mppc) to the 2v position and jumpers jp1 and jp3 to the 5v and 3v positions respectively and connect voltmeters to measure v in and boost v out . with the power supply set to 3.5v, apply voltage to the input. with an adjustable load on the boost output, begin increasing the load on the 5v output. figure 1. proper measurement equipment setup
3 dc1587f demo manual dc1587 quick start procedure figure 3. correct method for measuring input or output voltage ripple figure 2. maximum power point control programmed for 2v, operating from a high impedance input power source (10) as the output load current increases, the voltage on v in decreases due to the 10 input resistor. figure?2 shows v in , v out and pgood voltages as the load current is increased over a 2 second time period with the mppc programmed for 2v. the output remains at a regulated 5v until the input voltage drops to the 2v mppc threshold. the mppc prevents the input voltage from dropping below 2v by reducing the output volt- age. without mppc, the output voltage would drop to near 0v resulting in zero output power. connecting the mppc pin to gnd will disable the mppc function. also shown in figure 1 is the power good (pgood) signal that pulls low when the boost output voltage drops 10% below the programmed value. minal and ground. connect a resistor of approximately 0.5 between the supply output and v in . adjust the supply to approximately 250mv to 300mv and verify that the boost output is in regulation. since this dc/dc converter is designed to operate from relatively high impedance power sources, some source resistance is neccessary for proper low voltage start-up. at very low input voltage, excessive input current may result unless there is some source resistance. 4. additional demo board features include the following. jumper jp4 allows the pgood open drain fet pull-up resistor to be connected to the ldo output voltage or to an external voltage applied to the vpgood termi- nal. the converter can be shutdown by pulling shdn terminal low. mppc jumper allows the user to select several preset mppc voltages or select the diode ter- minal when using diodes located near the solar panel for mppc temperature tracking. a small circular pad on the board allows the ltc3105 aux pin to be probed when evaluating the circuit. do not connect a load to this pad. v in (v) 3.5 2.5 3.0 2.0 1.5 boost v out (v) 4 6 2 0 2 seconds dc1587 f02 v out (2v/div) load current (20ma/div) pgood signal v in 3. to verify very low voltage start-up (250mv to 300mv) it is necessary to do the following; remove jumper jp2 and add an external 22k resistor between the mppc ter-
4 dc1587f demo manual dc1587 parts list item quantity reference part description manufacturer, part number required circuit components 1 1 c1 capacitor, x5r, 10f, 6.3v, 10%, 0805 avx, 08056d106kat2a 2 1 c3 capacitor, x5r, 10f, 16v, 10%, 0805 taiyo yuden, emk212bj106kg-t 3 1 c5 capacitor, npo, 33pf, 25v, 5%, 0402 avx, 04023a330jat2a 4 1 c8 capacitor, x5r, 1f, 16v, 10%, 0603 avx, 0603yd105kat2a 5 1 l1 inductor, 10h sumida, cdrh3d18np-100n 6 1 r1 resistor, chip, 392k, 1/16w, 1%, 0402 vishay, crcw0402392kfked 7 1 r4 resistor, chip, 499k, 1/16w, 1%, 0402 vishay, crcw0402499kfked 8 1 r6 resistor, chip, 40.2k, 1/16w, 1%, 0402 vishay, crcw040240k2fked 9 1 r10 resistor, chip, 100k, 1/16w, 1%, 0402 vishay, crcw0402100kfked 10 1 u1 ic, LTC3105EDD, 3mm 3mm dfn linear technology, LTC3105EDD additional circuit components 1 0 c2 tantalum, opt 2 1 c4 capacitor, x5r, 1f, 16v, 10%, 0805 avx, 0805yd105kat2a 3 1 c6 capacitor, npo, 33pf, 25v, 5%, 0402 avx, 04023a330jat2a 4 1 c7 capacitor, x5r, 4.7f, 16v, 10%, 0805 taiyo yuden, emk212bj475mg-t 5 1 c10 capacitor, x7r, 10nf, 50v, 10%, 0603 avx, 06035c103kat2a 6 1 r2 resistor, chip, 750k, 1/16w, 1%, 0402 vishay, crcw0402750kfked 7 1 r3 resistor, chip, 845k, 1/16w, 1%, 0402 vishay, crcw0402845kfked 8 1 r5 resistor, chip, 0, 0402 vishay, crcw04020000jked 9 1 r7 resistor, chip, 200k, 1/16w, 1%, 0402 vishay, crcw0402200kfked 10 1 r8 resistor, chip, 402k, 1/16w, 1%, 0402 vishay, crcw0402402kfked 11 1 r9 resistor, chip, 549k, 1/16w, 1%, 0402 vishay, crcw0402549kfked 12 1 r11 resistor, chip, 274k, 1/16w, 1%, 0402 vishay, crcw0402274kfked 13 1 r12 resistor, chip, 1.1m, 1/16w, 1%, 0402 vishay, crcw04021m10fked hardware 1 12 e1-e12 testpoint, turret, 0.095" mill-max, 2501-2-00-80-00-00-07-0 2 2 jp4 , jp5 0.079 single row header, 3-pin samtec, tmm-103-02-l-s 3 1 jp2 2mm double row header 4mm 2mm samtec, tmm-104-02-l-d 4 2 jp1 , jp3 2mm double row header 2mm 3mm samtec, tmm-103-02-l-d 5 5 jp1-jp5 shunt samtec, 2sn-bk-g
5 dc1587f demo manual dc1587 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a cdrh3d18np-100n mppc 0.4v 2v diode vpgood vldo pgood shdn on off 0805 boost 5v 1.8v 3.3v ldo 1.5v 2.2v 3v 1.8v / 3.3v / 5v 1.5v / 2.2v / 3v @6ma 0805 0805 0805 0.2v - 5v 4v 2. install shunts as shown. 1. all resistors are in 0402 all capacitors are in 0402 note: unless otherwise specified 3 5 2 ' 8 & 7 , 2 1 ) 5 $ 1 + 0603 0603 ldo ldo 6 , = ( ' $ 7 ( , & 1 2 5 ( 9 6 + ( ( 7 2 ) 7 , 7 / ( $ 3 3 5 2 9 $ / 6 3 & % ' ( 6 $ 3 3 ( 1 * technology ) d [ 0 l o s l w d v & $ 3 k r q h 0 f & d u w k \ % o y g / 7 & & r q i l g h q w l d o ) r u & x v w r p h u 8 v h 2 q o \ & 8 6 7 2 0 ( 5 1 2 7 , & ( / , 1 ( $ 5 7 ( & + 1 2 / 2 * < + $ 6 0 $ ' ( $ % ( 6 7 ( ) ) 2 5 7 7 2 ' ( 6 , * 1 $ & , 5 & 8 , 7 7 + $ 7 0 ( ( 7 6 & 8 6 7 2 0 ( 5 6 8 3 3 / , ( ' 6 3 ( & , ) , & $ 7 , 2 1 6 + 2 : ( 9 ( 5 , 7 5 ( 0 $ , 1 6 7 + ( & 8 6 7 2 0 ( 5
6 5 ( 6 3 2 1 6 , % , / , 7 < 7 2 9 ( 5 , ) < 3 5 2 3 ( 5 $ 1 ' 5 ( / , $ % / ( 2 3 ( 5 $ 7 , 2 1 , 1 7 + ( $ & 7 8 $ / $ 3 3 / , & $ 7 , 2 1 & 2 0 3 2 1 ( 1 7 6 8 % 6 7 , 7 8 7 , 2 1 $ 1 ' 3 5 , 1 7 ( ' & , 5 & 8 , 7 % 2 $ 5 ' / $ < 2 8 7 0 $ < 6 , * 1 , ) , & $ 1 7 / < $ ) ) ( & 7 & , 5 & 8 , 7 3 ( 5 ) 2 5 0 $ 1 & ( 2 5 5 ( / , $ % , / , 7 < & 2 1 7 $ & 7 / , 1 ( $ 5 7 ( & + 1 2 / 2 * < $ 3 3 / , & $ 7 , 2 1 6 ( 1 * , 1 ( ( 5 , 1 * ) 2 5 $ 6 6 , 6 7 $ 1 & ( 7 + , 6 & , 5 & 8 , 7 , 6 3 5 2 3 5 , ( 7 $ 5 < 7 2 / , 1 ( $ 5 7 ( & + 1 2 / 2 * < $ 1 ' 6 & + ( 0 $ 7 , & 6 8 3 3 / , ( ' ) 2 5 8 6 ( : , 7 + / , 1 ( $ 5 7 ( & + 1 2 / 2 * < 3 $ 5 7 6 6 & $ / ( 1 2 1 ( z z z o l q h d u f r p 7 x h v g d \ 1 r y h p e h u 9 ( 5 < / 2 : 9 , 1 6 7 ( 3 8 3 & 2 1 9 ( 5 7 ( 5 - : ) 5 $ 1 + 1 $ / 7 & ( ' ' ' ( 0 2 & , 5 & 8 , 7 $ : , 7 + 0 $ ; , 0 8 0 3 2 : ( 5 3 2 , 1 7 & 2 1 7 5 2 / $ 1 ' / ' 2 6 , = ( ' $ 7 ( , & 1 2 5 ( 9 6 + ( ( 7 2 ) 7 , 7 / ( $ 3 3 5 2 9 $ / 6 3 & % ' ( 6 $ 3 3 ( 1 * technology ) d [ 0 l o s l w d v & $ 3 k r q h 0 f & d u w k \ % o y g / 7 & & r q i l g h q w l d o ) r u & x v w r p h u 8 v h 2 q o \ & 8 6 7 2 0 ( 5 1 2 7 , & ( / , 1 ( $ 5 7 ( & + 1 2 / 2 * < + $ 6 0 $ ' ( $ % ( 6 7 ( ) ) 2 5 7 7 2 ' ( 6 , * 1 $ & , 5 & 8 , 7 7 + $ 7 0 ( ( 7 6 & 8 6 7 2 0 ( 5 6 8 3 3 / , ( ' 6 3 ( & , ) , & $ 7 , 2 1 6 + 2 : ( 9 ( 5 , 7 5 ( 0 $ , 1 6 7 + ( & 8 6 7 2 0 ( 5
6 5 ( 6 3 2 1 6 , % , / , 7 < 7 2 9 ( 5 , ) < 3 5 2 3 ( 5 $ 1 ' 5 ( / , $ % / ( 2 3 ( 5 $ 7 , 2 1 , 1 7 + ( $ & 7 8 $ / $ 3 3 / , & $ 7 , 2 1 & 2 0 3 2 1 ( 1 7 6 8 % 6 7 , 7 8 7 , 2 1 $ 1 ' 3 5 , 1 7 ( ' & , 5 & 8 , 7 % 2 $ 5 ' / $ < 2 8 7 0 $ < 6 , * 1 , ) , & $ 1 7 / < $ ) ) ( & 7 & , 5 & 8 , 7 3 ( 5 ) 2 5 0 $ 1 & ( 2 5 5 ( / , $ % , / , 7 < & 2 1 7 $ & 7 / , 1 ( $ 5 7 ( & + 1 2 / 2 * < $ 3 3 / , & $ 7 , 2 1 6 ( 1 * , 1 ( ( 5 , 1 * ) 2 5 $ 6 6 , 6 7 $ 1 & ( 7 + , 6 & , 5 & 8 , 7 , 6 3 5 2 3 5 , ( 7 $ 5 < 7 2 / , 1 ( $ 5 7 ( & + 1 2 / 2 * < $ 1 ' 6 & + ( 0 $ 7 , & 6 8 3 3 / , ( ' ) 2 5 8 6 ( : , 7 + / , 1 ( $ 5 7 ( & + 1 2 / 2 * < 3 $ 5 7 6 6 & $ / ( 1 2 1 ( z z z o l q h d u f r p 7 x h v g d \ 1 r y h p e h u 9 ( 5 < / 2 : 9 , 1 6 7 ( 3 8 3 & 2 1 9 ( 5 7 ( 5 - : ) 5 $ 1 + 1 $ / 7 & ( ' ' ' ( 0 2 & , 5 & 8 , 7 $ : , 7 + 0 $ ; , 0 8 0 3 2 : ( 5 3 2 , 1 7 & 2 1 7 5 2 / $ 1 ' / ' 2 6 , = ( ' $ 7 ( , & 1 2 5 ( 9 6 + ( ( 7 2 ) 7 , 7 / ( $ 3 3 5 2 9 $ / 6 3 & % ' ( 6 $ 3 3 ( 1 * technology ) d [ 0 l o s l w d v & $ 3 k r q h 0 f & d u w k \ % o y g / 7 & & r q i l g h q w l d o ) r u & x v w r p h u 8 v h 2 q o \ & 8 6 7 2 0 ( 5 1 2 7 , & ( / , 1 ( $ 5 7 ( & + 1 2 / 2 * < + $ 6 0 $ ' ( $ % ( 6 7 ( ) ) 2 5 7 7 2 ' ( 6 , * 1 $ & , 5 & 8 , 7 7 + $ 7 0 ( ( 7 6 & 8 6 7 2 0 ( 5 6 8 3 3 / , ( ' 6 3 ( & , ) , & $ 7 , 2 1 6 + 2 : ( 9 ( 5 , 7 5 ( 0 $ , 1 6 7 + ( & 8 6 7 2 0 ( 5
6 5 ( 6 3 2 1 6 , % , / , 7 < 7 2 9 ( 5 , ) < 3 5 2 3 ( 5 $ 1 ' 5 ( / , $ % / ( 2 3 ( 5 $ 7 , 2 1 , 1 7 + ( $ & 7 8 $ / $ 3 3 / , & $ 7 , 2 1 & 2 0 3 2 1 ( 1 7 6 8 % 6 7 , 7 8 7 , 2 1 $ 1 ' 3 5 , 1 7 ( ' & , 5 & 8 , 7 % 2 $ 5 ' / $ < 2 8 7 0 $ < 6 , * 1 , ) , & $ 1 7 / < $ ) ) ( & 7 & , 5 & 8 , 7 3 ( 5 ) 2 5 0 $ 1 & ( 2 5 5 ( / , $ % , / , 7 < & 2 1 7 $ & 7 / , 1 ( $ 5 7 ( & + 1 2 / 2 * < $ 3 3 / , & $ 7 , 2 1 6 ( 1 * , 1 ( ( 5 , 1 * ) 2 5 $ 6 6 , 6 7 $ 1 & ( 7 + , 6 & , 5 & 8 , 7 , 6 3 5 2 3 5 , ( 7 $ 5 < 7 2 / , 1 ( $ 5 7 ( & + 1 2 / 2 * < $ 1 ' 6 & + ( 0 $ 7 , & 6 8 3 3 / , ( ' ) 2 5 8 6 ( : , 7 + / , 1 ( $ 5 7 ( & + 1 2 / 2 * < 3 $ 5 7 6 6 & $ / ( 1 2 1 ( z z z o l q h d u f r p 7 x h v g d \ 1 r y h p e h u 9 ( 5 < / 2 : 9 , 1 6 7 ( 3 8 3 & 2 1 9 ( 5 7 ( 5 - : ) 5 $ 1 + 1 $ / 7 & ( ' ' ' ( 0 2 & , 5 & 8 , 7 $ : , 7 + 0 $ ; , 0 8 0 3 2 : ( 5 3 2 , 1 7 & 2 1 7 5 2 / $ 1 ' / ' 2 5 ( 9 , 6 , 2 1 + , 6 7 2 5 < ' ( 6 & 5 , 3 7 , 2 1 ' $ 7 ( $ 3 3 5 2 9 ( ' ( & 2 5 ( 9 5 ( 9 , 6 , 2 1 + , 6 7 2 5 < ' ( 6 & 5 , 3 7 , 2 1 ' $ 7 ( $ 3 3 5 2 9 ( ' ( & 2 5 ( 9 5 ( 9 , 6 , 2 1 + , 6 7 2 5 < ' ( 6 & 5 , 3 7 , 2 1 ' $ 7 ( $ 3 3 5 2 9 ( ' ( & 2 5 ( 9 e8 pgood e8 pgood e12 gnd e12 gnd c4 1uf 16v c4 1uf 16v r7 200k 1% r7 200k 1% e9 vpgood e9 vpgood r9 549k 1% r9 549k 1% e10 shdn e10 shdn jp2 jp2 1 2 3 4 5 6 8 7 c7 4.7uf 16v c7 4.7uf 16v r6 40.2k 1% r6 40.2k 1% r4 499k 1% r4 499k 1% l1 10uh l1 10uh r12 1.1m 1% r12 1.1m 1% r10 100k r10 100k r8 402k 1% r8 402k 1% jp4 jp4 1 2 3 c10 10nf c10 10nf c6 33pf c6 33pf r11 274k 1% r11 274k 1% r2 750k 1% r2 750k 1% r3 845k 1% r3 845k 1% e7 gnd e7 gnd e1 +vin e1 +vin e2 gnd e2 gnd jp1 jp1 1 2 3 4 5 6 jp5 jp5 1 2 3 c8 1uf 16v c8 1uf 16v e3 boost output e3 boost output c5 33pf c5 33pf exposed pad solder side u1 LTC3105EDD exposed pad solder side u1 LTC3105EDD fb 1 sw 7 pgood 8 vin 6 gnd 11 aux 10 shdn 4 fbldo 3 vout 9 ldo 2 mppc 5 r5 0 r5 0 e11 diode e11 diode + tant c2 (opt.) + tant c2 (opt.) r1 392k 1% r1 392k 1% jp3 jp3 1 2 3 4 5 6 e5 gnd e5 gnd c1 10uf 6.3v c1 10uf 6.3v c3 10uf 16v c3 10uf 16v e4 mppc e4 mppc e6 ldo output e6 ldo output
6 dc1587f demo manual dc1587 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2010 lt 1210 ? printed in usa demonstration board important notice linear technology corporation (ltc) provides the enclosed product(s) under the following as is conditions: this demonstration board (demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by ltc for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the europ ean union direc- tive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other r egulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither party shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases ltc fro m all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory co mpliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoever. ltc assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind . ltc currently services a variety of customers for products around the world, and therefore this transaction is not exclusive . please read the demo board manual prior to handling the product . persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged . this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a ltc applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation
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