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1 description contents lt c4125eufd and lt c4120 eud wireless power transfer battery charger demonstration kit demonstration kit dc2386a is a kit of the dc2330a lt c ? 4125eufd demonstration board, the dc2445a-a/ dc2445a-b LTC4120EUD demonstration board, and an assortment of different length standoffs. the dc2330a can deliver up to 1.68w to the receive board with up to 12mm spacing between the transmit and receive coils. the 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. performance summary dc2330a transmitter supports foreign object detection via the ltc4125. design files for this circuit board are available at http: //www.linear.com/demo/dc2386a specifications are at t a = 25c figure 1. dc2330a picture figure 2. dc2445a-a/dc2445a-b picture symbol parameter conditions min typ max units v in dc2330 a voltage input i vin 2.5a 3 5.5 v i vin dc2330a v in current v in = 5v 2.0 a v bat dc2445 a-a bat pin voltage 4.15 4.2 4.25 v v bat dc2445 a-b bat pin voltage r9 = 1.40m, r10 = 1.05m 4.2 v i bat dc2445 a bat pin current v bat = 3.7v, dc2445a-a/dc2445a-b(r5) = 3.01k 370ma 385ma 400ma a air gap separation between lt x and lr x i bat = 400ma (figure 3) 8.25 mm 1 dc2330a (ltc4125eufd) demo board 1 dc2445a-a/dc2445a-b (LTC4120EUD) demo board (with 12.5mm (0.5") nylon standoffs, 8.25mm gap), see figure 3 4 6.25mm (0.25? ) nylon standoffs ( 2.0mm gap) 4 9.5mm (0.375? ) nylon standoffs ( 5.25mm gap) 4 15.9mm (0.625? ) nylon standoffs ( 11.65mm gap) kit build options kit number t x board ltc t x part number r x board ltc r x part number r x option dc2386a-a dc2330a ltc4125eufd dc2445a-a LTC4120EUD-4.2 fixed 4.2v float voltage dc2386a-b dc2330a ltc4125eufd dc2445a-b LTC4120EUD adjustable float voltage dc2386aabfa demo manual dc2386a-a/dc2386a-b
2 quick start procedure figure 3. as shipped demo kit air gap refer to figure 4 for the proper measurement equip - ment setup and jumper settings, dc2445a mounting on dc2330 a, and follow the procedure below. note. when measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. measure the input or output voltage ripple by touching the probe tip directly across the v cc or v in and gnd terminals. see figure 5 for proper scope probe technique. 1. place the dc 2445 a - a / dc 2445 a - b board atop the dc2330a board, by aligning: (see figure 4) dc2330a mounting hole dc2445a-a/b mh mh 3 => mh1 mh 2 => mh2 mh 4 => mh3 mh 6 => mh4 this should result in the transmit antenna being directly above the receive antenna, with the centers aligned. the standoffs on the dc 2445 a - a / dc 2445 a - b are 0.5"(12.5mm) when shipped. this results in an air gap of 8.25mm (see figure 3). the dc2386a kit ships with three additional standoff sizes. this allows the air gap to be varied from 0.083" (~2.0mm) to 0.46" (~11.6mm). 2. set ps1 = 3.7v, ps2 = 5 v, and enable the power sup- plies. the dc2330a should start sweeping the lt x cur - rent looking for a load. this is evinced by the blue leds lighting up sequentially. when a valid load is found the led sweeping will freeze until the next search period, 3.7s later. note that the last led, the red led, should not normally be lit. observe am1 and am2. am2 should have increased from 10ma rms, 250ma peak to about 600ma. am1 should be reading 380ma ?~?400ma of charge current into the battery emulator. all the charge leds on the dc2445a-x should now be lit. if the dc2445a-x board is receiving power, it will at- tempt to charge the battery . again this is evinced by the green leds lighting. if all the green leds are lit, the LTC4120EUD, on the dc2445a, is charging at the full programmed battery charge current. 3. the ltc4125eufd on the dc2330a, keeps the transmit power at slightly more than the load requires for 3.7s, then searches again. this is why the blue leds on the dc2330a go out and start ramping up again. 4. when the system is operating correctly, slide a piece of blank pcb*, or coin between the transmit and receive coils. the transmit current should immediately drop to 0a. this is the foreign object detection in operation, preventing a foreign object from getting hot. 5. please change the standoffs on the dc2445 a - a / dc2445a-b board to yield the air gap most appropriate for your project. *testing with a blank pcb of at least 10cm 2 (1.5 in 2 ) of copper. f01 412.5mm (0.5 inch) standoffs dc2445 pcb dc2330 pcb 4.25mm 8.25mm 12.5mm lt x lr x embedded in pcb dc2386aabfa demo manual dc2386a-a/dc2386a-b
3 quick start procedure figure 5. measuring input or output ripple am2 ps2 5v supply 1a + ? connecting the dc2445a-a/dc2445a-b connecting the dc2330a dc2445a-a/dc2445a-b mounted on top of dc2330a + ? am2 ps2 5v supply 1a + ? + ? am1 ps1 3.7v bipolar supply 1a + ? + ? am1 ps1 3.7v bipolar supply 1a + ? + ? note: all connections from equipment should be kelvin connected directly to the board pins which they are con - nected on this diagram and any input or output leads should be twisted pair. figure 4. equipment setup for dc2386aCa/dc2386aCb kit dc2386aabfa demo manual dc2386a-a/dc2386a-b
4 theory of operation the dc2386a kit demonstrates operation of a magneti - cally coupled resonant wireless power transfer (wpt) system. the ltc4125 eufd transmitter searches for a suitable load, and powers it until the next search period. the ltc4120 eud battery charger uses dhc to control its input power ensuring full power charging under a variety of operating conditions. dc2330a C wireless power transmitter board featuring the ltc4125eufd the dc2330 a wireless power transmitter is used to power a load wirelessly. in this kit, it is used in conjunction with the dc2445a-x wireless power receiver board to charge a li-ion battery. the ltc4125eufd implements an autoresonant drive of the series resonant tank composed of lt x (see lt x table?1 for a list of tested lt x coils) and ct x (see dc2330a sche- matic on page 12). the autoresonant drive uses a zero crossing detector to determine the resonant frequency of the series lc circuit. all subsequent duty cycles dis - cussed here use the resonant period determined by the autoresonant circuitry. the sw1 and sw2 pins each have a half bridge drive. at zero current crossing, whichever sw x pin has current flow - ing out of the pin, is set to v in for a duty cycle determined by the corresponding pth x pin (see figure 10). when the sw x pin is set to v in , it increases the current flowing in the transmitter series resonant lc circuit. the absolute value of the tank current is determined by the resonant tank components and also by the reflected load impedance. the ltc4125eufd sweeps the duty cycle by way of a 5 bit dac that sets the pth x voltage, and hence duty cycle. the fb pin is driven by the node forming the junction of the transmit coil, lt x , and the transmit capacitor, ct x . the voltage at this node is proportional to the circulating current in the transmitter resonant tank (see figure 8). the ltc4125eufd monitors the fb pin and when a valid exit condition is found, stops incrementing the pth vdac. the pth vdac is held at the detection level for the rest of the sweep cycle. some exit conditions are adjustable by the user, and some are proprietary and not adjustable. as load power requirements may change or foreign ob - jects may enter the wp t transfer field, the ltc4125eufd periodically repeats the sweep as described above. several of the components of the sweep period are adjustable, but the dc2330 a sets the overall sweep period to about 3.7s (see figure 9). the autoresonant detect circuity will shift the transmitter frequency for some fault conditions, particularly foreign object detection (fod). table 1. tested ltx coils vendor part number url wrth 760308100110 http: //www.we-online.com inter-technical l4000t02 http: //www.inter-technical.com/index.php?page=products# sunlord swa50n50h35c05b http: //www.sunlordinc.com/ dc2386aabfa demo manual dc2386a-a/dc2386a-b
5 theory of operation figure 6. coil side of transmit coil, lt x figure 7. backside of transmit coil, lt x figure 8. fb i(lt x ), lt. blue = ltc4125.fb, grn. = i(lt x ) figure 9. dk. blue = v(pth), lt. blue = ltc4125.fb, pk. = v(prog), grn. = ltc4120.in dc2386aabfa demo manual dc2386a-a/dc2386a-b
6 theory of operation the ltc4125 eufd also monitors the fb for fault conditions and terminates the sweep if one is detected. thermal shutdown the ltc4125 needs to produce a large magnetic field in lt x , in order to transfer as much power as possible. the magnetic field is proportional to the current flowing in lt x , and the rms value of the current flowing in lt x will dissipate any power not transferred to the load. the ltc4125 uses an ntc resistor to monitor the tem - perature of lt x and shut off the transmit power if the ntc reports a temperature higher than 42c. please see the applications section of the data sheet for more detailed information. transmit coils are often quite large and bulky, composed of the windings and a very usually a ferrite shield. it is undesirable to place the temperature monitoring ntc resistor on the windings. this is because the winding are radiating power, and the ntc resistor and wires form a loop. if this loop is immediately adjacent to the transmit coil windings, it will pick up significant voltage and apply it to the ltc4125 ntc pin. the ideal place for the ntc would be on the side of the transmit coil distal to the windings. therefore it is necessary to study the relationship between winding temperature and ferrite shield temperature, especially on the distal surface of the ferrite shield. figure 6 is a thermal image of the coil side of the wurth 760308100110 transmit coil at 42. 0c, and figure 7 is a thermal image of the backside of the same coil at 41.7c. figure 7 is was taken in free air, after heating the coil while in contact with the dc2330a pcb. the ntc is located in hole n, which is aligned with the ring of max temperature, on the backside of the transmit coil, lt x . these thermal images are very specific to the wurth 760308100110 transmit coil and pcb mount. this study should be repeated for any application circuit, using a different transmit coil to ensure proper ntc placement. dc2445a-a/dc2445a-b C wireless power receiver board featuring the LTC4120EUD the dc2445 a-a/dc2445 a-b demo board implements a series resonant lc circuit. the ac waveform on the resonant circuit is rectified and applied to the in pin of the LTC4120EUD wireless power receiver ic. the undervoltage current limit (uvcl) of the LTC4120EUD is at 12v. so, when v in exceeds the uvcl threshold, the ltc4120 eud tries to charge a battery on its bat pin. the LTC4120EUD also has dynamic harmonization control (dhc), which can be used to tune or detune the figure 10. dk. blue = ltc4125.sw1, lt. blue = ltc4125.sw2, grn. = i(lt x ) figure 11. dk. blue = ltc4120.in, grn. = i(bat) dc2386aabfa demo manual dc2386a-a/dc2386a-b
7 theory of operation figure 12. power transfer vs axial distance and misalignment dc2386aabfa demo manual dc2386a-a/dc2386a-b
8 theory of operation receive circuit to receive more or less power as needed. the dc2445a-x is designed to work with the dc2330a wireless power transmitter board. the ltc4125eufd on the dc2330 a is already searching for an appropriate load so the dhc loop has been repurposed on the dc2445a demo board to provide presence detect. dhc because the lt c4125 eufd on the dc2330 a wireless power transmitter already searches for an appropriate load, the dhc loop on the dc2445a has been repurposed. when v in is above 14v, the dhc pin is high impedance, and when it is below 14v it is grounded through a mosfet. the receive tank is tuned to a fixed 127khz, and on the dc2445 a-x the dhc does not change this frequency. on the dc2445 a-x the dhc pin is used to activate a 15v clamp. the assertion of this clamp signals the ltc4125 , on the dc2330 a board, that it is transmitting sufficient power. the battery charger the battery charger is a current mode buck regulator from in to bat. the current in the switching inductor ( l1) is monitored by an on die current sense resistor between the chgsns and bat pins. this current is used for cycle by cycle pwm duty cycle determination, and averaged to indicate battery charge current. the charger is a full featured cc-cv charger, with low bat - tery trickle charge (see figure 11). the charge voltage is fixed at 4.2v for the ltc4120 eud-4.2, and programmable on the LTC4120EUD. the charge current is programmed by the resistor on the prog pin, r5 on the dc2445a-x. summary the dc2386 a wireless power transfer battery char - ger demonstration kit allows full exploration of the lt c4125 eufd wireless power transmitter and ltc4120 eud wireless power battery charger. the dc2386a makes it possible to determine how the ltc4125eufd identifies a valid load or foreign object. dc2386aabfa demo manual dc2386a-a/dc2386a-b
9 parts list item qty reference part description manufacturer/part number dc2330a required circuit components 1 1 ct x cap, chip, c0g, 0.1f, 5%, 100v, 1206 tdk, c3216c0g2a104j160ac 2 2 c4, c5 cap, chip, x7r, 0.01f, 10%, 50v, 0402 tdk, c1005x7r1h103k050bb 3 1 c6 cap, chip, x7r, 4700pf, 10%, 50v, 0402 murata, gr m155r71h472ka01 4 1 c7 cap, chip, c0g, 470pf, 10%, 50v, 0402 kemet, c0402c471k5gactu 5 1 c8 cap, chip, x5r, 0.1f, 10%, 25v, 0402 tdk, c1005x5r1e104k050bc 6 1 c9 cap, chip, x7r, 0.1f, 10%, 100v, 0603 murata, gr m188r72a104ka35d 7 1 c10 cap, chip, x5r, 1f, 10%, 16v, 0402 tdk, c1005x5r1c105k050bc 8 2 c11, c12 cap, chip, x5r, 47f, 20%, 6.3v, 0805 tdk, c2012x5r0j476m125ac 9 1 d3 diode, smt, schottky, 30v, 200ma , 0.6mm 1.0mm dfn2 diodes inc., bat54lp 10 1 d4 diode, smt, 100v, 250ma, 50ns, sod523 diodes inc., bas521-7 11 1 lt x transmit antenna, 24h, 10%, 6a, 0.1, round, 50mm diameter wurth, 760308100110 12 1 ntc assembly ntc resistor assembly, 10k at 25c, 1% murata, ft n55xh103fd4b 13 1 r2 res, chip, 4 terminal, 22m, 1%, 1w, 3216t4 susumu, krl3216t4-m-r022-f 14 1 r3 res, chip, 12.4k, 1%, 1/16w, 040+d20:d262 vishay, crcw040212 k4fked 15 0 r4 -opt, r7 -opt, r11 -opt res, chip, tbd, 1%, 1/16w, 0402 tbd 16 2 r5, r6 res, chip, 100k, 1%, 1/16w, 0402 vishay, crcw0402100kfked 17 1 r8 res, chip, 0 jumper, 1/16w, 0402 vishay, crcw04020000z0ed 18 1 r9 res, chip, 3.83k, 1%, 1/16w , 0402 vishay, crcw04023 k83fked 19 1 r10 res, chip, 59.0k, 1%, 1/16w, 0402 vishay, crcw040259 k0fked 20 1 r14 res, chip, 348k, 1%, 1/16w, 0402 vishay, crcw0402348kfked 21 1 r15 res, chip, 5.23k, 1%, 1/16w, 0402 vishay, crcw04025 k23fked 22 1 r16 res, chip, 100k, 1%, 1/8w, 350v, 0603 rohm, ktr03ezpf1003 23 1 r18 res, chip, 10k, 1%, 1/16w, 0402 vishay, crcw040210 k0fked 24 1 u1 ic, autoresonant wireless power transmitter, 4mm 5mm qfn20 linear tech., ltc4125eufd#pbf additional demo board circuit components 1 3 c1, c2, c3 cap, chip, x5r, 100f, 20%, 6.3v, 1206 murata, gr m31cr60j107me39l 2 3 c13, c15, c16 cap, chip, x7r, 0.01f, 10%, 50v, 0402 tdk, c1005x7r1h103k050bb 3 2 c14, c17 cap, chip, x5r, 1f, 10%, 16v, 0402 tdk, c1005x5r1c105k050bc 4 2 d1, d13 led, red, smt, 0603 lumex, sml-lx0603siw-tr 5 0 d2 -opt diode, smt, schottky, 30v, 200ma, 0.6mm 1.0mm dfn2 diodes inc., bat54lp 6 1 d5 led, green, smt, 0603 lumex, sml-lx0603sugw-tr 7 7 d6 ~ d12 led, blue, smt, 0603 lite-on, ltst- c193 tbkt-5a 8 3 r1, r17, r41 res, chip, 2.2k, 5%, 1/16w, 0402 vishay, crcw04022 k20jned 9 8 r12, r24 ~ r30 res, chip, 102k, 1%, 1/16w, 0402 vishay, crcw0402102kfked 10 1 r13 res, chip, 0 jumper, 1/16w, 0402 vishay, crcw04020000z0ed 11 1 r19 res, chip, 10k, 5%, 1/16w, 0402 vishay, crcw040210 k0jned 12 2 r20, r33 res, chip, 432, 1%, 1/16w, 0402 vishay, crcw0402432rfked 13 1 r21 res, chip, 15.4k, 1%, 1/16w, 0402 vishay, crcw040215 k4fked 14 1 r22 res, chip, 27.4k, 1%, 1/16w, 0402 vishay, crcw040227 k4fked 15 1 r23 res, chip, 340k, 1%, 1/16w, 0402 vishay, crcw0402340kfked dc2386aabfa demo manual dc2386a-a/dc2386a-b
10 item qty reference part description manufacturer/part number 16 1 r31 res, chip, 11.3k, 1%, 1/16w, 0402 vishay, crcw040211 k3fked 17 1 r32 res, chip, 787k, 1%, 1/16w, 0402 vishay, crcw0402787kfked 18 7 r34 ~ r40 res, chip, 6.20k, 5%, 1/16w, 0402 vishay, crcw04026 k20jned 19 1 r42 -opt, r43 res, chip, 1, 5%, 1/10w, 0603 vishay, crcw06031 r00jned 20 2 u2, u3 ic, ultralow power quad comparators with reference, 3mm 3mm dfn8 linear tech., ltc1445cdhd#pbf hardware: for demo board only 1 3 e1, e4, e5 turret, 0.09" dia mill-max, 2501-2-00-80-00-00-07-0 2 2 e2, e3 vertical nana jack, 575-4 keystone, 575-4 3 1 j1 micro-usb receptacle wurth, 629105136821 4 1 j2 jsc connector for ntc assembly murata, m m5829-2700rj4 5 3 jp1, jp2, jp3 3 pin jumper, 2mm wurth, 62000311121 6 3 jp1, jp2, jp3 shunt, 2mm samtec, 2sn-kb-g 7 4 stand - off, nylon, 0.375" tall (snap on) keystone, 8832 (snap on) 8 0.01 scotch, removable poster tape w/dispenser, 0. 75in.x 150in. 3m, mmm109 9 0.0004 heat cure thermal epoxy, 30cc tube ellsworth adh. 3-6752 tc adhesive 75g dc2445a-a/dc2445a-b required circuit components 1 1 c2s1 cap, chip, c0g, 0.033f, 5%, 50v, 1206/0805 tdk, c2012c0g1h333j125aa 2 1 c1 cap, chip, x5r. 4.7f, 10%, 25v, 0805 tdk, c2012x5r1e475k 3 1 c2 cap, chip, x5r, 47f, 10%, 16v, 1210 murata, gr m32er61c476ke15l 4 1 c3 cap, chip, x7r, 0.01f, 10%, 50v, 0402 tdk, c1005x7r1h103r050bb 5 1 c4 cap, chip, x5r, 2.2f, 20%, 6.3v, 0402 murata, gr m155r60j225me15d 6 1 c5 cap, chip, x7s, 10f, 20%, 50v, 1210 tdk, c3225x7s1h106m 7 1 c11 cap, chip, x5r, 47f, 20%, 6.3v, 0805 tdk, c2012x5r0j476m 8 2 d1, d2 diode, schottky, 40v, 2a, powerdi123 diodes, dfls240l 9 1 d3 diode, zener, 13v, 5%, 150mw, sod-523 diodes, bzt52c13 t- 7 10 1 d4 diode, zener, 39v, 5%, 1w, powerdi123 diodes, dflz39 11 1 fd1 25mm ferrite disc elna magnetics, b67410-a0223-x195 12 0 lrx ind, embedded, 47h , 43 turns embedded 13 1 l1 ind, smt, 15h, 260m, 20%, 0.86a, 4mm 4mm lps4018-153ml 14 1 m1 mosfet, smt, 60v, 72m , powerpak1212-8 vishay, s i7308dn-t1-ge3 15 1 m2 mosfet, smt, 30v, 75m, sot23 vishay, s i2343cds-t1-ge3 16 1 q1 npn, smt, 40v, sot23 diodes inc, mmbt3904-7-f 17 1 r1 res, chip, 1.40m, 1%, 1/16w, 0402 vishay, crcw04021 m40fked 18 1 r2 res, chip, 412k, 1%, 1/16w, 0402 vishay, crcw0402412kfked 19 2 r3, r7 res, chip, 10k , 1%, 1/16w, 0402 vishay, crcw040210 k0fked 20 1 r5 res, chip, 3.01k, 1, 1/16w, 0402 vishay, crcw04023 k01fked 21 2 r6, r8 res, chip, 0 jumper, 1/16w, 0402 vishay, crcw04020000z0ed 26 1 r12 res, chip, 5.1k, 5%, 1/16w, 0402 vishay, crcw04025 k10jned 22 1 r36 res, chip, 1k, 5%, 1/16w, 0402 vishay, crcw04021 k00jned 23 1 r37 res, chip, 24.9k, 1%, 1/16w, 0402 vishay, crcw040224 k9fked parts list dc2386aabfa demo manual dc2386a-a/dc2386a-b
11 schematic diagram item qty reference part description manufacturer/part number 24 1 r38 res, chip, 470k, 5%, 1/16w, 0402 vishay, crcw0402470kjned 25 1 r39 res, chip, 51k, 5%, 1/16w, 0402 vishay, crcw040251 k0jned additional demo board circuit components 1 1 c2s2 -opt cap, chip, c0g,tbd, 5%, 50v, 0603 tbd 2 2 c7, c10 cap, chip, x5r, 1f, 10%, 16v, 0402 tdk, c1005x5r1c105k 3 3 c6, c8, c9 cap, chip, x7r, 0.01f, 10%, 25v, 0402 tdk, c1005x7r1e103k 4 8 d5 ~ d12 diode, led, green, 0603 lite-on, ltst- c193 kgkt-5a 5 1 r4 res, chip, 2k, 5%, 1/16w, 0402 vishay, crcw04022 k00jned 6 1 r11 res, chip, 100k, 5%, 1/16w, 0402 vishay, crcw0402100kjned 7 1 r13 res, chip, 10k, 5%, 1/16w, 0402 vishay, crcw040210 k0jned 8 2 r14, r35 res, chip, 432, 1%, 1/16w, 0402 vishay, crcw0402432rfked 9 2 r15, r33 res, chip, 22.6k, 1%, 1/16w, 0402 vishay, crcw040222 k6fked 10 1 r16 res, chip, 34.8k, 1%, 1/16w, 0402 vishay, crcw040234 k8fked 11 7 r17 ~ r23 res, chip, 100k, 1%, 1/16w, 0402 vishay, crcw0402100kfked 12 1 r24 res, chip, 49.9k, 1%, 1/16w, 0402 vishay, crcw040249 k9fked 13 8 r25 ~ r32 res, chip, 1k, 5%, 1/16w, 0402 vishay, crcw04021 k00jned 14 1 r34 res, chip, 787k, 1%, 1/16w, 0402 vishay, crcw0402787kfked 15 2 u2, u3 ultralow power quad comparators with reference, 5mm 4mm dfn16 linear tech., ltc1445cdhd hardware: for demo board only 1 6 e1, e2, e5, e6, e9, e10 turret, 0.091" mill-max, 2501-2-00-80-00-00-07-0 2 4 e3, e4, e7, e8 turret, 0.061" mill-max, 2308-2-00-80-00-00-07-0 3 0 j1 -opt conn, 3 pin polarized hirose, df3-3p-2dsa 4 4 jp1, jp3-jp5 header, 3 pin jumper, 2mm samtec, tmm-103-02-l-s 5 1 jp2 header, 4 pin jumper, 2mm samtec, tmm-104-02-l-s 6 5 jp1-jp5 shunt, 2mm samtec, 2sn-bk-g 7 4 clear 0.085" 0.335" bumper keystone, 784-c 8 0.005 scotch, removable poster tape w/dispenser, 0. 75in. 0.75in. 3m, mmm109 9 4 stand-off, nylon, 0.375" keystone, 8832 dc2445a-a required circuit components 1 0 r9 no load. smd 0402 2 1 r10 res, chip, 0 jumper, 1/16w, 0402 vishay, crcw04020000z0ed 3 1 u1 400ma wireless synchronous buck battery charger, 3mm 3mm qfn16 linear tech., LTC4120EUD-4.2 dc2445a-b required circuit components 1 1 r9 res, chip, 1.40m, 1%, 1/16w, 0402 vishay, crcw04021 m40fked 2 1 r10 res, chip, 1.05m, 1%, 1/16w, 0402 vishay, crcw04021 m05fked 3 1 u1 400ma wireless synchronous buck battery charger, 3mm 3mm qfn16 linear tech., LTC4120EUD dc2386aabfa demo manual dc2386a-a/dc2386a-b
12 schematic diagram 4 4 3 3 2 2 1 1 4 4 3 3 2 2 1 1 unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v 3 - 5.5v pwr status disable ntc enable disable enable en opt ith = 1.29a ilim = 1.93a 2a opt vin imon size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 1 2 auto resonant wireless transmitter n/a demo circuit 2330a nc gb 9 - 23 - 15 ltc4125eufd size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 1 2 auto resonant wireless transmitter n/a demo circuit 2330a nc gb 9 - 23 - 15 ltc4125eufd size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 1 2 auto resonant wireless transmitter n/a demo circuit 2330a nc gb 9 - 23 - 15 ltc4125eufd revision history description date approved eco rev gb production fab 51 - 32 -9 2 - revision history description date approved eco rev gb production fab 51 - 32 -9 2 - revision history description date approved eco rev gb production fab 51 - 32 -9 2 - e4 r1 2.2k 5% r12 102k r18 10k c4 0.01f r3 12.4k u1 ltc4125eufd in 1 gnd 16 pgnd 21 in1 20 in2 17 sw1 19 sw2 18 is- 3 is+ 4 fb 13 ntc 6 iimon 5 cts 2 en 15 ctd 14 stat 8 pthm 12 pth1 11 pth2 10 dth 7 fth 9 c9 0.1f 100v 0603 r8 0 r15 5.23k r10 59.0k c8 0.1f e3 gnd jp2 c11 47f 10v 0805 r6 100k r9 3.83k r7 opt c7 470pf c5 0.01f r4 opt d1 ctx 0.1f 1206 100v r13 0 d4 bas521 2 1 r43 1 0603 e5 c1 100f 6.3v 1206 r5 100k c2 100f 6.3v 1206 r16 100k 0603 c3 100f 6.3v 1206 c6 4700pf r14 348k d5 r11 opt e1 c10 1uf 16v r2 22mohm 1% d3 bat54lp r17 2.2k 5% jp1 e2 vin ltx 24h t jsc connector ntc 10k@25c r42 1 0603 j1 usb micro b receptacle wurth, 629105136821 vbus 1 d- 2 d+ 3 id 4 gnd 5 gnd 6 gnd 7 gnd 9 gnd 8 d2 c12 47f 10v 0805 dc2386aabfa demo manual dc2386a-a/dc2386a-b
13 schematic diagram 4 4 3 3 2 2 1 1 4 4 3 3 2 2 1 1 input current 1.221v disable monitor u3.3 u2.3 1.186v 1.186v enable imon vin size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 ltc4125eufd 2 2 bar graph for auto resonant n/a nc gb wireless transmitter 9 - 23 - 15 demo circuit 2330a size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 ltc4125eufd 2 2 bar graph for auto resonant n/a nc gb wireless transmitter 9 - 23 - 15 demo circuit 2330a size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 ltc4125eufd 2 2 bar graph for auto resonant n/a nc gb wireless transmitter 9 - 23 - 15 demo circuit 2330a r38 6.20k 5% u2e ltc1445cdhd ref 8 v- 9 r22 27.4k c13 0.01f c17 1f 16v r19 10k 5% u2a ltc1445cdhd 5 4 14 9 2 3 17 u3e ltc1445cdhd ref 8 v- 9 r20 432 u2d ltc1445cdhd 13 12 14 9 15 3 17 d7 29% 1 2 r27 102k jp3 r25 102k d10 71% 1 2 u3b ltc1445cdhd 7 6 14 9 1 3 17 c14 1f 16v r31 11.3k d8 43% 1 2 r23 340k r32 787k r41 2.2k 5% d12 100% 1 2 r24 102k u3a ltc1445cdhd 5 4 14 9 2 3 17 r39 6.20k 5% r28 102k r36 6.20k 5% u3c ltc1445cdhd 11 10 14 9 16 3 17 r34 6.20k 5% u2c ltc1445cdhd 11 10 14 9 16 3 17 d11 86% 1 2 r35 6.20k 5% c15 0.01f u3d ltc1445cdhd 13 12 14 9 15 3 17 r26 102k r29 102k d9 57% 1 2 c16 0.01f r40 6.20k 5% r37 6.20k 5% d6 14% 1 2 u2b ltc1445cdhd 7 6 14 9 1 3 17 d13 150% 1 2 r33 432 r21 15.4k r30 102k dc2386aabfa demo manual dc2386a-a/dc2386a-b
14 schematic diagram 4 4 3 3 2 2 1 1 4 4 3 3 2 2 1 1 unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v opt 400ma 2.7 v - 11v 1210 12 - 40v presence detect -b assy * -a 1.40meg 0 ohm open r10 r9 1.05meg ltc4120 - 4.2eud LTC4120EUD u1 opt disconnected connected embedded inductor freq 1.5 mhz 750 khz off run vin > 11v on ext ntc int intvcc intvcc intvcc vbar vprog size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2445a - a / b 1 2 400ma wireless synchronous buck battery charger n/a LTC4120EUD - 4.2 / LTC4120EUD nc george b. 9 - 25 - 15 size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2445a - a / b 1 2 400ma wireless synchronous buck battery charger n/a LTC4120EUD - 4.2 / LTC4120EUD nc george b. 9 - 25 - 15 size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2445a - a / b 1 2 400ma wireless synchronous buck battery charger n/a LTC4120EUD - 4.2 / LTC4120EUD nc george b. 9 - 25 - 15 revision history description date approved eco rev george b. production 51 - 52 - 9 1 - revision history description date approved eco rev george b. production 51 - 52 - 9 1 - revision history description date approved eco rev george b. production 51 - 52 - 9 1 - d1 dfls240l e9 gnd c5 10f 50v e7 chrg c3 0.01f jp4 l1 15.0h q1 mmbt3904lt1 r4 2.0k 5% c2s2 tbd 50v 0805 e6 bat r39 51k 5% c1 4.7f 25v 0805 r6 0 m2 si2343cds r10 * u1 LTC4120EUD-4.2 / LTC4120EUD run 16 prog 13 intvcc 1 gnd 5 ntc 12 gnd 17 bat 9 in 3 dhc 6 batsns/fb 10 freq 7 boost 2 sw 4 chgsns 8 fault 15 chrg 14 nc/fbg 11 r9 * e4 prog r8 0 r12 5.1k 5% e8 fault r5 3.01k e2 gnd r2 412k e10 in r37 24.9k r38 470k 5% r36 1k 5% r11 100k 5% e1 cx d2 dfls240l r1 1.40meg e3 ntc c2s1 0.033f 5% 50v 1206/0805 c11 47f 6.3v 0805 embedded inductor 43t lrx 47h e5 gnd r7 10k m1 si7308dn jp3 c2 47f 16v 1210 13v d3 bzt52c15 c4 2.2f 6.3v r3 10k jp1 jp2 j1 df3-3p-2dsa bat 1 gnd 2 entc 3 39v d4 dflz39 dc2386aabfa demo manual dc2386a-a/dc2386a-b
15 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 representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. schematic diagram unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v 1.221v u2.3 u3.3 1.186v 1.186v charge current disable monitor enable vprog vbar size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2445a - a / b 2 2 bar graph for 400ma wireless synchronous n/a LTC4120EUD - 4.2 / LTC4120EUD nc george b. buck battery charger 9 - 25 - 15 size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2445a - a / b 2 2 bar graph for 400ma wireless synchronous n/a LTC4120EUD - 4.2 / LTC4120EUD nc george b. buck battery charger 9 - 25 - 15 size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2445a - a / b 2 2 bar graph for 400ma wireless synchronous n/a LTC4120EUD - 4.2 / LTC4120EUD nc george b. buck battery charger 9 - 25 - 15 d12 94% 1 2 r21 100k c8 0.01f r14 432 u2e ltc1445cdhd ref 8 v- 9 r25 1k 5% r32 1k 5% r16 34.8k jp5 d6 19% 1 2 r19 100k u3d ltc1445cdhd 13 12 14 9 15 3 17 r20 100k u2c ltc1445cdhd 11 10 14 9 16 3 17 r26 1k 5% c9 0.01f u3b ltc1445cdhd 7 6 14 9 1 3 17 r17 100k r24 49.9k c6 0.01f r23 100k u2d ltc1445cdhd 13 12 14 9 15 3 17 r18 100k r30 1k 5% r35 432 r33 22.6k c7 1f 10v r28 1k 5% u3e ltc1445cdhd ref 8 v- 9 d10 69% 1 2 r29 1k 5% r34 787k c10 1f 10v d9 56% 1 2 d11 81% 1 2 d8 44% 1 2 r13 10k 5% d5 6% 1 2 d7 31% 1 2 u3c ltc1445cdhd 11 10 14 9 16 3 17 r31 1k 5% r22 100k r27 1k 5% r15 22.6k u2b ltc1445cdhd 7 6 14 9 1 3 17 u2a ltc1445cdhd 5 4 14 9 2 3 17 u3a ltc1445cdhd 5 4 14 9 2 3 17 dc2386aabfa demo manual dc2386a-a/dc2386a-b
16 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2016 lt 0316 rev a ? 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 european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. 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 from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory compliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoeve r . 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 application engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc2386aabfa demo manual dc2386a-a/dc2386a-b

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