08/18/03 IRDCIP1201-A, 300khz, dual 15a, 3.14v in to 5.5v in dual output synchronous buck converter using ip1201 overviewthe ip1201 is fully optimized solution for medium current synchro- nous buck applications requiring up to 15a or 30a. in this document, fig. 1, 2, 3 and 4 are provided to enable engineers to easily evaluate the ip1201 in an independent and parallel configuration that is capable of providing up to 15a per phase with double-sided heat sinking. fig. 6, 7 and 8 and the complete bill of materials in table 1 are provided as a reference design to enable engineers to very quickly and easily design a dual phase converter. in order to optimize this design to your specific requirements, refer to the ip1201 data sheet for guidelines on external component selection and user adjustable limits and specifications. custom designs may require layout modifi- cations. demoboard quick start guideinitial settings: the output1 is set to 1.5v and output2 is set to 2.5v for independent configuration. the output1 is set to 1.5v with r8, r10, r11 and r12 removed for parallel configuration. output can be adjusted from 0.8v to 3.3v as follow: 1. v out1 : r9=r13= r7 [(v out 1 / vref) C 1]. set r7=r14=1k,vref=0.8v 2. v out2 : r10=r11= r8 [(v out2 / vref) C 1]. set r8=r12=1k,vref=0.8v. the switching frequency is set to r3=30.9k for 300khz the input voltage range can be increased to allow operation between 3.14v in and 5.5v in . for paralleled single output operation see fig. 6 for configuration table in reference designschematic. procedure for connecting and powering up demoboard: 1. connected jp2 for v in < 3.5v. 2. disconnected jp2 for vin > 3.5v. 3. make sure jp3 is connected 4. apply input voltage (3.14v-5.5v) across v in and pgnd 5. apply load across vout1 pad and pgnd pad and vout2 pad and pgnd pad for independent configuration. 6. apply load across vout1 pad and pgnd pad and short r23 for parallel configuration. 7. adjust load accordingly. IRDCIP1201-A recommended operating conditions(refer to the ip1201 datasheet for maximum operating conditions) input voltage: 3.14 - 5.5v output voltage: can be set between 0.8v C 3.3v, up to 90% max duty cycle. output current: up to 15a (see recommended operating area fig. 1, 2 and 3). the maximum current should be limited to 11.5a if the pcb is the only heat sink. switching freq: 200khz to 400khz selectable. IRDCIP1201-A international rectifier ? 233 kansas street, el segundo, ca 90245 usa r eference d esign r eference d esign downloaded from: http:///
www.irf.com 2 IRDCIP1201-A fig. 1: recommended operating area 200khz fig. 2: recommended operating area 300khz fig. 3: recommended operating area 400khz 0 2 4 6 8 10 12 14 16 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 output voltage (v) load current (a) v in = 3.3v f sw = 200khz v in = 5 . 0 v 0 2 4 6 8 10 12 14 16 0. 8 1 1. 2 1. 4 1. 6 1. 8 2 2. 2 2. 4 2. 6 2. 8 3 3. 2 3. 4 output voltage (v) load current (a) v in = 3.3v v in = 5 . 0 v f sw = 300khz 0 2 4 6 8 10 12 14 16 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 output voltage (v) load current (a) f sw = 400khz v in = 3 . 3 v v in = 5 v fig. 4 : per channel switching frequency vs r t 200 220 240 260 280 300 320 340 360 380 400 20 25 30 35 40 45 50 r t in kohms switching frequency in khz downloaded from: http:///
www.irf.com 3 IRDCIP1201-A fig. 5 - typical efficiency vs. current refer to the following application notes for detailed guidelines and suggestions when implementing ipowir technology products: an-1028: recommended design, integration and rework guidelines for international rectifiers ipowir technology bga packages this paper discusses the assembly considerations that need to be taken when mounting ipowir bgas on printed circuit boards. this includes soldering, pick and place, reflow, inspection, cleaning and reworking recommendations. an-1029: optimizing a pcb layout for an ipowir technology design this paper describes how to optimize the pcb layout design for both thermal and electrical performance. this includes placement, routing, and via interconnect suggestions. an-1030: applying ipowir products in your thermal environment this paper explains how to use the power loss and soa curves in the data sheet to validate if the operating conditions and thermal environment are within the safe operating area of the ipowir product. an-1047: graphical solution to two branch heatsinking safe operating area this paper is a suppliment to an-1030 and explains how to use the double side power loss and soa curves in the data sheet to validate if the operating conditions and thermal environment are within the safe operating area of the ipowir product. v in = 5v, v out1 = 1.5v, v out2 = 2.5v 84% 85% 86% 87% 88% 89% 90% 91% 92% 93% 94% 95% 1234567891 01 11 21 31 41 5 output current(a) efficiency 200khz 300khz 400khz for output current greater than 11a per channel, pcb and device case temperature will need to remain within the soa of the ip1201. see ip1201 datasheet and an-1047. downloaded from: http:///
www.irf.com 4 IRDCIP1201-A vi n ss1 vp- ref pgnd cc1 fb1 vsw1 hiccup fb1s vsw2 fb2 cc2 enable pgood ss2 rt sync vref fb2s a vsw1s vsw2s b ip1201 vi n ss1 vp- ref pgnd cc1 fb1 vsw1 hiccup fb1s vsw2 fb2 cc2 enable pgood ss2 rt sync vref fb2s a vsw1s vsw2s b tp1 vin tp2 pgnd c8 0.1uf ss1 l1 1.0uh tp8 vsw1 c12 470uf c25 ni c14 0.1uf tp14 pgnd 6.3v r9 887 1% r7 1k 1% fb1 c9 0.01uf r5 4.75k cc1 r15 5mohm r16 0 c15 470uf c17 0.1uf l2 1.0uh r10 2.15k 1% r8 1k 1% tp10 vsw2 c16 470uf c11 6800pf tp12 pgnd r6 7.15k 6. 3v 6 . 3v vsw2 fb2 cc2 r19 5mohm r17 0 enable pgood tp6 sync vsw1 vin vp-ref c7 0.1uf ss2 r3 30.9k c10 100pf hiccup r1 100k r2 100k r13 887 1% r14 1k 1% r11 2.15k 1% r12 1k 1% 0.8v tp11 vout1 tp13 vout2 fb1s vref fb2s rt sync desi g nator independent m ode( dual o utput) 2 p hase mode(si ng le out p ut) r16 r17 r8 r10 removed removed installed installed installed installed removed removed output configuration r4 instal l ed removed r15, r1 9s h o r t 5 m ohm ? **for independent mode, output voltages are set by using the following equations: for vout1: set r7 (or r8) to 1k, vref to 0.8v, and vout to desired output, then solve f or r9 (or r10 respectively). r9 = r7[(vout1/vref) - 1]. for vout2: r10 = r8[(vout2/vref) - 1]. for parallel (single output) mode, check table on the left. ? ? ? ? ? ? ** ** r40 ? 2 1 jp1 hiccup 2 1 jp3 enable vin vin a tp28 vin tp29 pgnd tp15 vout1 tp16 pgnd tp17 vout2 tp18 pgnd jp1-1 shunt jp3-1 shunt vo ut1 vo ut2 tp20 vout1 tp22 pgnd tp3 vin tp4 pgnd r22 0 fb1s r11 r12 instal l ed removed r22 removed i nstal l ed c18 1uf (optional) b vsw2s c6 100uf c5 100uf c4 100uf c3 100uf c2 100uf c1 100uf 6.3v 6.3v 6.3v 6.3v 6.3v 6.3v 2 1 jp2 a/b jp2-1 shunt vsw1s c19 100pf c20 100pf r23 0 r23 removed i nstal l ed( short ed) r24 100k vin c13 470uf 6.3v c26 ni c22 ni r26 ni c21 ni r25 ni c23 ni r27 ni c24 ni r28 ni type iii compensation *for vin > 3.5v, remove jumper jp2. *for vin < 3.5v, short a & b through jp2 jumper. ?? * ? ? ? (1.5v) (2.5v) (short for independent 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 con4 input/output vins pgnds vsw1s vsw2s vou t1 vou t2 enable ? designator type ii configuration type iii configuration c21, c2 3 c22, c2 4 c9, c11 r5, r6 removed removed installed installed installed installed installed removed compensation configuration installed r2 5, r26, r27, r28 removed ?? output configuration) (short for independent output configuration) vin=3.14v-5.5v fig. 6 - reference design schematic downloaded from: http:///
www.irf.com 5 IRDCIP1201-A fig. 7 - component placement (top view) sidelayer fig. 8 - component placement (bottom view) downloaded from: http:///
www.irf.com 6 IRDCIP1201-A table 1 - reference design bill of materials ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: ++ 1 310 252 7105 technical assistance center (tac) fax : ++ 1 310 252 7903 use of this design for any application should be fully verified by the customer. international rectifier cannot guarantee suitability for your applications, and is not liable for any result of usage for such applications including, without limitation, personal or property damage or violation of third party intellectual property rights. IRDCIP1201-A (single, paralleled output configuration(for 1.5v output) IRDCIP1201-A (dual, independent output configurations(channel1 1.5v output, channel2 2.5v output) qty ref designator description size mfr part number 6 c1, c2, c3, c4, c5, c6 capacitor, ceramic, 100f, 6.3v, x5r, 20% 1812 tdk c4532x5r0j107 m 3 c10, c19,c20 capacitor, ceramic, 100pf, 50v, npo, 5% 0603 phycomp 0603cg101j9b20 1 c11 capacitor, ceramic, 6800pf, 50v, x7r, 10% 0603 koa x7r0603httd682k 4 c12, c13, c15, c16 capacitor, poscap, 470f, 6.3v, electrolytic 20% 7343 sanyo 6tpb470m 4 c14, c17, c7, c8 capacitor, ceramic, 0.1f, 16v, x7r, 10% 0603 murata grm188r71c104ka01d 1 c18 capacitor, ceramic, 1.00f, 16v, x7r, 10% 0805 murata grm40x7r105k016 14 c21, c22, c23, c24, c25, c26, r16, r17, r22, r23, r25, r26, r27, r28 not installed - - - 1 c9 capacitor, ceramic, 0.01f, 50v, x7r, 10% 0603 samsun g cl10b103kbnc 2 l1, l2 inductor, 1h, 19a, 20% 13.0mm x 12.9mm panasonic etqp1h1r0bf a 3r 1 , r 2 , r 2 4 resistor, thick film, 100k ? , 1/10w, 1% 0603 koa rk73h1j1003f 2r 1 0 , r 1 1 resistor, thick film, 2.15k ? , 1/10w, 1% 0603 koa rk73h1j2151f 4 r12, r14, r7, r8 resistor, thick film, 1.0k ? , 1/10w, 1% 0603 koa rk73h1j1001f 2r 1 3 , r 9 resistor, thick film, 887 ? , 1/10w, 1% 0603 koa rk73h1j8870f 2r 1 5 , r 1 9 resistor, man g anin-foil, 0 ? , 2w 2716 isotek corp smt-r000 1r 3 resistor, thick film, 30.9k ? , 1/10w, 1% 0603 koa rk73h1j3092f 1 r 4 resistor, thick film, 0 ? , 1/10w 0603 rohm mcr03ezhj000 1r 5 resistor, thick film, 4.75k ? , 1/10w, 1% 0603 koa rk73h1jltd4751f 1r 6 resistor, thick film, 7.15k ? , 1/10w, 1% 0603 koa rk73h1jltd7151f 1 u1 bga power block 9.25mm x 15.5mm ir ip1201 qty ref designator description size mfr part number 6 c1, c2, c3, c4, c5, c6 capacitor, ceramic, 100f, 6.3v, x5r, 20% 1812 tdk c4532x5r0j107m 3 c10, c19,c20 capacitor, ceramic, 100pf, 50v, npo, 5% 0603 phycomp 0603cg101j9b20 1 c11 capacitor, ceramic, 6800pf, 50v, x7r, 10% 0603 koa x7r0603httd682k 4 c12, c13, c15, c16 capacitor, poscap, 470f, 6.3v, electrolytic 20% 7343 sanyo 6tpb470m 4 c14, c17, c7, c8 capacitor, ceramic, 0.1f, 16v, x7r, 10% 0603 murata grm188r71c104ka01d 1 c18 capacitor, ceramic, 1.00f, 16v, x7r, 10% 0805 murata grm40x7r105k016 15 c21, c22, c23, c24, c25, c26, r10, r11, r12, r25, r26, r27, r28, r4, r8 not installed - - - 1 c9 capacitor, ceramic, 0.01f, 50v, x7r, 10% 0603 samsung cl10b103kbnc 2 l1, l2 inductor, 1h, 19a, 20% 13.0mm x 12.9mm panasonic etqp1h1r0bfa 3 r1, r2, r24 resistor, thick film, 100k ? , 1/10w, 1% 0603 koa rk73h1j1003f 2r 1 4 , r 7 resistor, thick film, 1.0k ? , 1/10w, 1% 0603 koa rk73h1j1001f 2r 1 3 , r 9 resistor, thick film, 887 ? , 1/10w, 1% 0603 ko a rk73h1j8870f 2r 1 5 , r 1 9 resistor, allo y metal, 5m ? , 1w, 1% 2512 panasonic erjm1wsf5m0u 1r 2 3 resistor, man g anin-foil, 0 ? , 2w 2716 isotek corp smt-r000 1r 3 resistor, thick film, 30.9k ? , 1/10w, 1% 0603 ko a rk73h1j3092f 3r 1 6 , r 1 7 , r 2 2 resistor, thick film, 0 ? , 1/10w 0603 rohm mcr03ezhj000 1r 5 resistor, thick film, 4.75k ? , 1/10w, 1% 0603 ko a rk73h1jltd4751f 1r 6 resistor, thick film, 7.15k ? , 1/10w, 1% 0603 koa rk73h1jltd7151f 1 u1 bga power block 9.25mm x 15.5mm ir ip1201 downloaded from: http:///
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