07/04/03 irdcip1202-a, 300khz, dual 15a, 5.5v in to 13.2v in dual output synchronous buck converter using ip1202 overview the ip1202 is fully optimized solution for medium current synchro- nous buck applications requiring up to 15a or 30a. in this document, fig. 1 and 2 are provided to enable engineers to easily evaluate the ip1202 in an independent and parallel configuration that is capable of providing up to 15a per phase with double-sided heat sinking. fig. 4, 5 and 6 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 ip1202 data sheet for guidelines on external component selection and user adjustable limits and specifi- cations. custom designs may require layout modifications. demoboard quick start guide initial 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 r4, 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) ? 1]. set r7=r14=1k,vref=0.8v 2. v out2 : r10=r11= r8 [(v out2 / vref) ? 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 5.5v in and 13.2v in . ? for paralleled single output operation see fig. 6 for configuration table in reference design schematic. procedure for connecting and powering up demoboard: 1. apply input voltage (5.5v-13.2v) across v in and pgnd 2. apply load across vout1 pad and pgnd pad and vout2 pad and pgnd pad for independent configuration. 3. apply load across vout1 pad and pgnd pad and short r27 for parallel configuration. 4. adjust load accordingly. irdcip1202-a recommended operating conditions (refer to the ip1202 datasheet for maximum operating conditions) input voltage: 5.5 - 13.2v output voltage: can be set between 0.8v ? 3.3v 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. irdcip1202-a international rectifier ? 233 kansas street, el segundo, ca 90245 usa r eference d esign r eference d esign
www.irf.com 2 irdcip1202-a 200 220 240 260 280 300 320 340 360 380 400 20 25 30 35 40 45 50 r t in kohm s switching frequency in khz fig. 2 : per channel switching frequency vs r t fig. 1: nominal overcurrent threshold setting external resistor selection for v in = 12v 4 8 12 16 20 24 28 32 36 40 44 48 52 56 4 6 8 10 12 14 16 18 20 22 24 overload current (a) r oc-set (k : ) v in = 12v v out1 = v out2 = 1.5v f sw = 300khz l = 1 p h t blk = 125c
www.irf.com 3 irdcip1202-a v in = 12v, v out1 = 1.5v, v out2 = 2.5v 70% 72% 74% 76% 78% 80% 82% 84% 86% 88% 90% 92% 123456789101112 output current(a) efficiency 200khz 300khz 400khz fig. 3 - 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 rectifier?s ipowir technology bga packages this paper discusses the assembly considerations that need to be taken when mounting ipowir bga?s 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.
www.irf.com 4 irdcip1202-a vin ss1 vp- ref pgnd cc1 fb1 vsw1 hiccup fb1s vsw2 fb2 cc2 enable pgood ss2 rt sync vref fb2s oc1 oc2 ip1202 vin ss1 vp- ref pgnd cc1 fb1 vsw1 hiccup fb1s vsw2 fb2 cc2 enable pgood ss2 rt sync vref fb2s oc1 oc2 c4 33uf c3 33uf c2 33uf c1 33uf 16v 16v 16v 16v tp1 vin tp2 pgnd c8 0.1uf ss1 l1 1uh tp8 vsw1 c12 470uf c13 470uf c14 0.1uf tp12 pgnd 6.3v 6.3v r9 887 1% r7 1k 1% fb1 c9 0.018uf r5 2.49k cc1 r15 5mohm r16 0 c15 470uf c17 0.1uf l2 1uh r10 2.15k 1% r8 1k 1% tp10 vsw2 c16 470uf c11 0.012uf tp14 pgnd r6 3.32k 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 designat or independent mode(dual output) 2 phase mode(single output) r16 r17 r8 r10 removed removed installed installed installed installed removed removed output configuration r4 inst alled removed r15, r19 short 5mohm ? **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 for r9 (or r10 respectively). r9 = r7[(vou t1/vref) - 1]. for vout2: r10 = r8[(vout2/vref) - 1]. for parallel (single output) mode, check table on the left. ? ? ? ? ? ? ** ** r4 0 ? 2 1 jp1 hiccup 2 1 jp3 enable vin vin roc1 51.1k 1% roc2 51.1k 1% oc1 oc2 tp28 vin tp29 pgnd tp15 vout1 tp16 pgnd tp17 vout2 tp18 pgnd (1.5v) (2.5v) vout1 vout2 vsw1s vsw2s tp20 vout1 tp22 pgnd tp3 vin tp4 pgnd r22 0 fb1s r11 r12 installed removed r22 removed installed c18 ni c19 ni c20 ni c21 ni r23 ni r24 ni r25 ni r26 ni c23 33uf c22 33uf 16v 16v c24 ni c25 ni c26 100pf c27 100pf type iii compensation *** *** *** *** *** *** *** *** *** ni: not installed r27 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 con4 input/output enable vins pgnds vsw1s vsw2s vout1 vout2 jp1-1 shunt jp3-1 shunt (short for independent output configuration) (short for independent output configuration) r27 0 ? ?? designator type ii configuration type iii configuration c18, c19 c20, c21 c9, c11 r5, r6 removed removed installed installed installed installed installed removed compensation configuration installed r23, r24, r25, r26 removed ?? fig. 4 - reference design schematic
www.irf.com 5 irdcip1202-a fig. 5 - component placement (top view) sidelayer fig. 6 - component placement (bottom view)
www.irf.com 6 irdcip1202-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. irdcip1202-a (single, paralleled output configuration(for 1.5v output) irdcip1202-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, c22, c23 capacitor, ceramic, 33f, 16v, x5r, 20% 1812 tdk c4532x5r1c336mt 4 c7, c8, c14, c17 ca p acitor, ceramic, 0.1 f, 50v, x7r, 10% 0603 tdk c1608x7r1h104k 1 c11 capacitor, ceramic, 0.012uf, 50v, x7r, 10% 0603 ph y comp 06032r123k8b20 4 c12, c13, c15, c16 capacitor, poscap, 470f, 6.3v, electrol y tic 20% 7343 san y o 6TPB470M 3 c10, c26, c27 ca p acitor, ceramic, 100 p f, 50v, npo, 5% 0603 ph y com p 0603cg101j9b20 1c9ca p acitor, ceramic, 0.018uf, 25v, x7r, 10% 0603 ph y com p 06032r183k8b20 2 l1, l2 inductor, 1h, 19a, 20% 13.0mm x 12.9mm panasonic etqp1h1r0bfa 2 r13, r9 resistor, thick film, 887 ? , 1/10w, 1% 0603 koa rk73h1j8870f 2 r10, r11 resistor, thick film, 2.15k ? , 1/10w, 1% 0603 koa rk73h1j2151f 4 r7, r8, r12, r14 resistor, thick film, 1.0k ? , 1/10w, 1% 0603 koa rk73h1j1001f 2roc1,roc2 resistor, thick film, 51.1k ? , 1/10w, 1% 0603 koa rk73h1j5112f 2 r15, r19 resistor, man g anin-foil, 0 ? , 2w 2716 isotek corp smt-r000 1 r4 resistor, thick film, 0 ? , 1/10w, 5% 0603 rohm mcr03ezhj000 14 c18, c19, c20, c21, c24, c25, r16, r17, r22, r23, r24, r25, r26, r27 not installed - - - 2r1, r2 resistor, thick film, 100k ? , 1/10w, 1% 0603 koa rk73h1j1003f 1r5 resistor, thick film, 2.49k ? , 1/10w, 1% 0603 koa rk73h1j2491f 1r6 resistor, thick film, 3.32k ? , 1/10w, 1% 0603 koa rk73h1jltd3321f 1r3 resistor, thick film, 30.9k ? , 1/10w, 1% 0603 koa rk73h1j3092f 1 u1 bga power block 9.25mm x 15.5mm ir ip1202 qty ref designator description size mfr part number 6 c1, c2, c3, c4, c22, c23 capacitor, ceramic, 33f, 16v, x5r, 20% 1812 tdk c4532x5r1c336mt 4 c7, c8, c14, c17 ca p acitor, ceramic, 0.1 f, 50v, x7r, 10% 0603 tdk c1608x7r1h104k 1 c11ca p acitor, ceramic, 0.012uf, 50v, x7r, 10% 0603 ph y com p 06032r123k8b20 4 c12, c13, c15, c16 ca p acitor, p osca p , 470 f, 6.3v, electrol y tic 20% 7343 san y o 6TPB470M 3 c10, c26, c27 capacitor, ceramic, 100pf, 50v, npo, 5% 0603 ph y comp 0603cg101j9b20 1 c9 capacitor, ceramic, 0.018uf, 25v, x7r, 10% 0603 ph y comp 06032r183k8b20 2 l1, l2 inductor, 1h, 19a, 20% 13.0mm x 12.9mm panasonic etqp1h1r0bfa 2r13, r9 resistor, thick film, 887 ? , 1/10w, 1% 0603 koa rk73h1j8870f 2r7, r14 resistor, thick film, 1.0k ? , 1/10w, 1% 0603 koa rk73h1j1001f 2 roc1,roc2 resistor, thick film, 51.1k ? , 1/10w, 1% 0603 koa rk73h1j5112f 2r15, r19 resistor, allo y metal, 5m ? , 1w, 1% 2512 panasonic erjm1wsf5m0u 1r27 resistor, man g anin-foil, 0 ? , 2w 2716 isotek corp smt-r000 3 r16, r17, r22 resistor, thick film, 0 ? , 1/16w 0603 rohm mcr03ezhj000 15 c18, c19, c20, c21, c24, c25, r10, r11, r12, r4, r8, r23, r24, r25, r26 not installed - - - 2r1, r2 resistor, thick film, 100k ? , 1/10w, 1% 0603 koa rk73h1j1003f 1r5 resistor, thick film, 2.49k ? , 1/10w, 1% 0603 koa rk73h1j2491f 1r6 resistor, thick film, 3.32k ? , 1/10w, 1% 0603 koa rk73h1jltd3321f 1r3 resistor, thick film, 30.9k ? , 1/10w, 1% 0603 koa rk73h1j3092f 1 u1 bga power block 9.25mm x 15.5mm ir ip1202
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