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1 application note 1905 author: paul orfanu isl85410eval1z, isl85410aeval1z, ISL85418EVAL1Z wide v in 1a and 800ma synchronous buck regulators description the isl85410eval1z, isl85410aeval1z, ISL85418EVAL1Z kits are intended for use for point-of-load applications sourcing from 3v to 36v. the kits are used to demonstrate the performance of the isl85410, isl85410a, isl85418 wide v in low quiescent current high efficiency sync buck regulators with 1a (isl85410, isl85410a) and 800ma (ISL85418EVAL1Z) output current. the isl85410, isl85410a, isl85418 are offered in a 4mmx3mm 12 ld dfn package with 1mm maximum height. the converter occupies 1.516cm 2 area. key features ? wide input voltage range 3v to 36v ? synchronous operation for high efficiency ? no compensation required ? integrated high-side and low-side nmos devices ? selectable pfm or forced pwm mode at light loads ? internal fixed (500khz) or adjustable switching frequency 300khz to 2mhz ? continuous output current up to 800ma ?internal or external soft-start ? minimal external components required ? power-good and enable functions available recommended equipment the following materials are recommended to perform testing: ? 0v to 50v power supply with at least 2a source current capability ? electronic loads capable of sinking current up to 2a ? digital multimeters (dmms) ? 100mhz quad-trace oscilloscope ? signal generator quick setup guide 1. ensure that the circuit is correctly connected to the supply and loads prior to applying any power. 2. connect the bias supply to vin, the plus terminal to vin (p4) and the negative return to gnd (p5). 3. verify that the position is on for s1. 4. turn on the power supply. 5. verify the output voltage is 3.3v for v out. evaluating the other output voltage the isl85410eval1z, isl85410aeval1z, ISL85418EVAL1Z kit outputs are preset to 3.3v; however, output voltages can be adjusted from 0.6v to 15v. the output voltage programming resistor, r 3 , will depend on the desired output voltage of the regulator. the value for the feedback resistor is typically between 0 ? and 50k ? as shown in equation 1. if the output voltage desired is 0.6v, then r 1 is shorted. please note that if v out is less than 1.8v, the switching frequency and compensation must be changed for 300khz operation due to minimum on-time limitation. please refer to datasheets isl85410 and isl85418 ( fn8375 / fn8369 ) for further information. table 1 on page 2 shows the component selection that should be used for the respective v outs . r 2 r 1 0.6 v out 0.6 ? --------------------------- ?? ?? = (eq. 1) figure 1. front of evaluation board isl85410eval1z f igure 2. back of evaluation board isl85410eval1z i s l 8 5 4 1 0 e v a l 1 z i s l 8 5 4 1 0 e v a l 1 z november 26, 2013 an1905.0 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas llc 2013. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners. free datasheet http:///
application note 1905 2 an1905.0 november 26, 2013 frequency control the isl85410, isl85410a, isl85418 have an fs pin that controls the frequency of oper ation. programm able frequency allows for optimization betw een efficiency and external component size. it also allows low frequency operation for low v outs when minimum on time would limit the operation otherwise. default switching frequency is 500khz when fs is tied to v cc (r 10 = 0). by removing r 10 the switching frequency could be changed from 300khz (r 12 = 340k) to 2mhz (r 12 = 32.4k). please refer to datashee ts isl85410 and isl85418 ( fn8375 / fn8369 ) for calculating the value of r 10 . do not leave this pin floating. disabling/enabling function the isl85410, isl85410a, isl85418 evaluation boards contain an s1 switch that enables or disabl es the part, thus allowing low quiescent current state. tabl e 2 details this function. sync control the isl85410, isl85410a, isl85418 evaluation boards have a sync pin that allows external synchronization frequency to be applied. default boar d configuration has r 6 = 200k to v cc , which defaults to pwm operation mode and also to the pre-selected switching frequency set by r 12 (see datasheet and previous section ?frequency control? for deta ils). if this pin is tied to gnd the ic will operate in pfm mode. the s2 switch allows forced pfm or pwm modes. soft-start/comp control r 15 selects between internal (r 15 = 0) and external soft-start. r 11 selects between internal (r 11 = 0) and external compensation. for applications where repetitive restarts of the ic are required, it is recommended to add a 350k ? resistor in parallel to css in order to allow it s fast discharge. please refer to pin description table of the isl85410 and isl85418 ( fn8375 / fn8369 ) datasheets. table 1. external component selection v out (v) l 1 (h) c out (f) r 2 (k ? ) r 3 (k ? ) c fb (pf) r fs (k ? ) r comp (k ? ) c comp (pf) 12 22 2x22 90.9 4.75 22 115 150 470 5 22 47f+22f 90.9 12.4 27 dnp (note 1) 100 470 3.3 22 47f+22f 90.9 20 27 dnp (note 1) 100 470 2.5 22 47f+22f 90.9 28.7 27 dnp (note 1) 100 470 1.8 12 47f+22f 90.9 45.5 27 dnp (note 1) 70 470 note: 1. connect fs to vcc table 2. switch settings s1 on/off control on enable v out off disable v out free datasheet http:///
application note 1905 3 an1905.0 november 26, 2013 isl85410eval1z schematic note: the input electrolytic capacitor c10 is optional and it is used to prevent transient voltages when the input test leads ha ve large parasitic inductance. it can be removed if the ic is used in a system application. u1 free datasheet http:///
application note 1905 4 an1905.0 november 26, 2013 bill of materials part number qty units reference designator description manufacturer manufacturer part isl85400eval1zrevapcb 1 ea see label-rename board pwb-pcb, isl85400eval1z, reva, rohs tbd isl85400eval1zrevapcb eee-fk1h151p-t 1 ea c10 cap, smd, 10.3mm, 150f, 50v, 20%, rohs, alum.elec. panasonic eee-fk1h151p h1045-00104-50v10-t 1 ea c3 cap, smd, 0603, 0.1f, 50v, 10%, x7r, rohs avx 06035c104kat2a h1045-00105-16v10-t 1 ea c9 cap, smd, 0603, 1f, 16v, 10%, x5r, rohs murata grm188r61c105ka12d h1045-00270-50v5-t 1 ea c4 cap, smd, 0603, 27pf, 50v, 5%, np0, rohs tdk c1608c0g1h270j h1045-00333-16v10-t 1 ea css cap, smd, 0603, 33000pf, 16v, 10%, x7r, rohs venkel c0603x7r160-333kne h1045-00471-50v5-t 1 ea c7 cap, smd, 0603, 470pf, 50v, 5%, np0, rohs panasonic ecj-1vc1h471j h1045-dnp 0 ea c8 cap, smd, 0603, dnp- place holder, rohs h1065-00106-50v10-t 2 ea c1, c2 cap, smd, 1206, 10f, 50v, 10%, x5r, rohs tdk c3216x5r1h106k h1065-00476-6r3v20-t c5 cap, smd, 1206, 47f, 6.3v, 20%, x5r, rohs murata grm31cr60j476me19l h1065-00226-6r3v20-t 2 ea c6 cap, smd, 1206, 22f, 6.3v, 20%, x5r, rohs panasonic ecj-dv50j226m dr73-220-r 1 ea l1 coil-pwr inductor, smd, 7.6mm, 22h, 20%, 1.62a, rohs cooper/coiltronics dr73-220-r 131-4353-00 2 ea j1, j2 conn-scope probe test pt, compact, pcb mnt, rohs tektronix 131-4353-00 1514-2 4 ea p4, p5, p7, p9 conn-turret, terminal post, th, rohs keystone 1514-2 5002 5 ea p1, p2, p6, p8, p10 conn-mini test point, vertical, white, rohs keystone 5002 ltst-c190kgkt-t 1 ea d1 led, smd, 0603, green clear, 2v, 20ma, 571nm, 35mcd, rohs liteon/vishay ltst-c190kgkt isl85410frz for isl85410eval1z, isl85410airz for isl85410aeval1z, isl85418frz for ISL85418EVAL1Z, 1 ea u1 ic-800ma buck regulator, 12p, dfn, 3x4, rohs intersil isl85410frz isl85410airz isl85418frz 2n7002lt1g-t 1 ea q1 transistor-mos, n-channel, smd, sot23, 60v, 115ma, rohs on semiconductor 2n7002lt1g h2511-00200-1/10w1-t 1 ea r4 res, smd, 0603, 20 ? , 1/10w, 1%, tf, rohs panasonic erj-3ekf20r0v h2511-00r00-1/10w-t 2 ea r10, r15 res, smd, 0603, 0 ? , 1/10w, tf, rohs venkel cr0603-10w-000t h2511-01003-1/10w1-t 1 ea r3 res, smd, 0603, 100k, 1/10w, 1%, tf, rohs venkel cr0603-10w-1003ft free datasheet http:///
application note 1905 5 an1905.0 november 26, 2013 h2511-02001-1/10w1-t 1 ea r5 res, smd, 0603, 2k, 1/10w, 1%, tf, rohs koa rk73h1jttd2001f h2511-02002-1/10w1-t 0 ea r2 res, smd, 0603, 20k, 1/10w, 1%, tf, rohs venkel cr0603-10w-2002ft h2511-02003-1/10w1-t 2 ea r6, r7 res, smd, 0603, 200k, 1/10w, 1%, tf, rohs venkel cr0603-10w-2003ft h2511-09092-1/10w1-t 1 ea r1 res, smd, 0603, 90.9k, 1/10w, 1%, tf, rohs panasonic erj-3ekf9092v h2511-dnp 0 ea r8, r9, r11, r12, r14 res, smd, 0603, dnp- place holder, rohs gt11mscbe-t 2 ea sw1, sw2 switch-toggle, smd, 6pin, spdt, 2pos, on-on, rohs itt industries/c&k division gt11mscbe 5x8-static-bag 1 ea place assy in bag bag, static, 5x8, ziploc, rohs intersil 212403-013 dnp 0 ea p3 (3vh30/1jn5) do not populate or purchase label-date code 1 ea label-date code_bom rev#_serial# label on zil & quel intersil label-date code label-rename board 1 ea rename pcb to: isl85410eval1z label, to rename board i ntersil label-rename board bill of materials (continued) part number qty units reference designator description manufacturer manufacturer part free datasheet http:///
application note 1905 6 an1905.0 november 26, 2013 isl85410eval1z board layout figure 3. silk screen top figure 4. silkscreen bottom free datasheet http:///
application note 1905 7 an1905.0 november 26, 2013 isl85410 efficiency curves f sw = 500khz, t a = +25c figure 5. efficiency vs load, pfm, v out = 12v figure 6. efficiency vs load, pwm, v out = 12v figure 7. efficiency vs load, pfm, v out = 5v, l1 = 30h figure 8. efficiency vs load, pwm, v out = 5v, l1 = 30h figure 9. efficiency vs load, pfm, v out = 3.3v figure 10. efficiency vs load, pwm, v out = 3.3v 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 v in = 15v v in = 24v v in = 33v output load (a) efficiency (%) 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 v in = 15v v in = 24v v in = 33v output load (a) efficiency (%) 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 output load (a) efficiency (%) v in = 6v v in = 15v v in = 24v v in = 12v 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 output load (a) efficiency (%) v in = 6v v in = 15v v in = 24v v in = 12v 50 55 60 65 70 75 80 85 90 95 100 v in = 5v v in = 15v v in = 24v v in = 12v v in = 33v output load (a) efficiency (%) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 output load (a) efficiency (%) v in = 5v v in = 15v v in = 24v v in = 12v v in = 33v free datasheet http:///
application note 1905 8 an1905.0 november 26, 2013 figure 11. efficiency vs load, pfm, v out = 1.8v figure 12. efficiency vs load, pwm, v out = 1.8v figure 13. efficiency vs load, pwm, v out = 5v, l1 = 30h figure 14. v out regulation vs load, pfm, v out = 5v, l1 = 30h figure 15. v out regulation vs load, pwm, v out = 3.3v figure 16. v out regulation vs load, pfm, v out = 3.3v isl85410 efficiency curves f sw = 500khz, t a = +25c (continued) 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 v in = 5v v in = 15v v in = 24v v in = 12v v in = 33v output load (a) efficiency (%) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 50 55 60 65 70 75 80 85 90 95 100 v in = 5v v in = 15v v in = 24v v in = 12v v in = 33v output load (a) efficiency (%) 4.993 4.994 4.995 4.996 4.997 4.998 4.999 5.000 5.001 5.002 5.003 5.004 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 output load (a) output voltage (v) v in = 6v v in = 15v v in = 24v v in = 12v 4.990 4.995 5.000 5.005 5.010 5.015 5.020 5.025 5.030 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 output load (a) output voltage (v) v in = 6v v in = 15v v in = 24v v in = 12v 3.316 3.317 3.318 3.319 3.320 3.321 3.322 3.323 3.324 3.325 3.326 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 output load (a) output voltage (v) v in = 5v v in = 15v v in = 12v v in = 33v v in = 24v 3.315 3.320 3.325 3.330 3.335 3.340 3.345 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 output load (a) output voltage (v) v in = 5v v in = 15v v in = 24v v in = 12v v in = 33v free datasheet http:///
application note 1905 9 an1905.0 november 26, 2013 figure 17. v out regulation vs load, pwm, v out = 1.8v figure 18. v out regulation vs load, pfm, v out = 1.8v isl85410 efficiency curves f sw = 500khz, t a = +25c (continued) 1.800 1.801 1.802 1.803 1.804 1.805 1.806 1.807 1.808 1.809 1.810 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 v in = 5v v in = 15v v in = 24v v in = 33v v in = 12v output load (a) output voltage (v) 1.800 1.802 1.804 1.806 1.808 1.810 1.812 1.814 1.816 1.818 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 output load (a) output voltage (v) v in = 5v v in = 15v v in = 24v v in = 33v v in = 12v isl85410 typical performance curves f sw = 500khz, v in = 24v, v out = 3.3v, t a = +25c figure 19. start-up at no load, pfm figure 20. start-up at 1a, pwm figure 21. figure 22. figure 23. shutdown at 1a, pwm figure 24. jitter at 1a load, pwm lx 20v/div v out 2v/div en 20v/div pg 2v/div 5ms/div lx 20v/div v out 2v/div i l 500ma/div pg 2v/div 5ms/div lx 20v/div v out 2v/div i l 500ma/div pg 2v/div 200s/div lx 5v/div 5ns/div free datasheet http:///
application note 1905 10 an1905.0 november 26, 2013 figure 25. steady state at no load, pfm figure 26. steady state at no load, pwm figure 27. steady state at 1a, pwm figure 28. light load operation at 20ma, pfm figure 29. load transient, pfm f igure 30. load transient, pwm isl85410 typical performance curves f sw = 500khz, v in = 24v, v out = 3.3v, t a = +25c (continued) lx 20v/div v out 20mv/div i l 20ma/div 10ms/div lx 20v/div v out 20mv/div i l 20ma/div 1s/div lx 20v/div i l 1a/div 1s/div v out 20mv/div lx 20v/div i l 200ma/div 10s/div v out 50mv/div i l 1a/div 200s/div v out 100mv/div i l 1a/div 200s/div v out 100mv/div free datasheet http:///
application note 1905 11 an1905.0 november 26, 2013 figure 31. pfm to pwm transition figure 32. overcurrent protection, pwm figure 33. overcurrent protection hiccup, pwm figure 34. sync at 1a load, pwm figure 35. negative current limit, pwm isl85410 typical performance curves f sw = 500khz, v in = 24v, v out = 3.3v, t a = +25c (continued) lx 20v/div i l 1a/div v out 20mv/div 10s/div lx 20v/div v out 2v/div i l 1a/div pg 2v/div 50s/div lx 20v/div v out 2v/div i l 1a/div pg 2v/div 10ms/div lx 20v/div sync 2v/div 200ns/div lx 20v/div v out 5v/div i l 1a/div pg 2v/div 20s/div free datasheet http:///
application note 1905 12 intersil corporation reserves the right to make changes in circuit design, software and/or specifications at any time without n otice. accordingly, the reader is cautioned to verify that the application note or technical brief is current before proceeding. for information regarding intersil corporation and its products, see www.intersil.com an1905.0 november 26, 2013 figure 36. negative current limit recovery, pwm figure 37. over-temperature protection, pwm isl85410 typical performance curves f sw = 500khz, v in = 24v, v out = 3.3v, t a = +25c (continued) lx 20v/div v out 5v/div i l 500ma/div pg 2v/div 200s/div v out 2v/div pg 2v/div 500s/div isl85410a only typical performance curves f sw = 500khz, v in = 24v, v out = 3.3v, t a = +25c figure 38. pgood delay, pwm, i out = 1a, ss = v cc figure 39. pgood delay, pwm, i out = 0a, ss = v cc figure 40. pgood low with v in = 0v, pwm, i _sink_pg = 1ma en 10v/div v out 2v/div pg 2v/div 2ms/div en 10v/div v out 2v/div pg 2v/div 2ms/div v in 10v/div pg 2v/div 10ms/div free datasheet http:///

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