REFERENCE DESIGN IRDCiP1201-A International Rectifier • 233 Kansas Street, El Segundo, CA 90245 USA IRDCiP1201-A, 300kHz, Dual 15A, 3.14VIN to 5.5VIN Dual Output Synchronous Buck Converter using iP1201 Overview The iP1201 is fully optimized solution for medium current synchronous 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 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 R8, R10, R11 and R12 removed for parallel configuration. Output can be adjusted from 0.8V to 3.3V as follow: 1. VOUT1: R9=R13= R7 [(VOUT 1/ Vref) – 1]. Set R7=R14=1k,Vref=0.8V 2. VOUT2: R10=R11= R8 [(VOUT2 / 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 3.14VIN and 5.5VIN. For paralleled single output operation see Fig. 6 for configuration table in reference design schematic. Procedure for Connecting and Powering Up Demoboard: 1. 2. 3. 4. 5. 6. 7. Connected JP2 for VIN < 3.5V. Disconnected JP2 for VIN > 3.5V. Make sure JP3 is connected Apply input voltage (3.14V-5.5V) across VIN and PGND Apply load across VOUT1 pad and PGND pad and VOUT2 pad and PGND pad for independent configuration. Apply load across VOUT1 pad and PGND pad and short R23 for parallel configuration. Adjust load accordingly. IRDCiP1201-A Recommended Operating Conditions (refer to the iP1201 datasheet for maximum operating conditions) Input voltage: Output voltage: Output current: 3.14 - 5.5V Can be set between 0.8V – 3.3V, up to 90% max duty cycle. 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. 08/18/03 IRDCiP1201-A 16 16 14 14 VI N =5.0V 12 Load Current (A) Load Current (A) VI N =3.3V 10 8 6 4 12 10 VI N =3.3V VI N =5.0V 8 6 4 2 2 f SW =300k Hz f SW =200k Hz 0 0 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 0.8 3.4 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 ) Output V oltage (V ) Fig. 2: Recommended Operating Area 300kHz Fig. 1: Recommended Operating Area 200kHz 16 Load Current (A) 14 VI N =3.3V 12 VI N = 5V 10 8 6 4 2 f SW =400kHz 0 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 Output V oltage (V ) Fig. 3: Recommended Operating Area 400kHz Switching Frequency in KHz 400 380 360 340 320 300 280 260 240 220 200 20 25 30 35 40 45 50 R T in KOhms 2 Fig. 4 : Per Channel Switching Frequency vs RT www.irf.com IRDCiP1201-A V IN = 5V, V OUT1 = 1.5V, V OUT2 = 2.5V 95% 94% 93% 92% Efficiency 91% 90% 89% 88% 87% 86% 200kHz 300kHz 400kHz 85% 84% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Output Current(A) Fig. 5 - Typical Efficiency vs. Current 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. 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 3 † 16 15 INPUT/OUTPUT 14 12 10 8 6 4 2 13 11 9 7 5 3 1 CON4 TP29 PGND C1 100uF 6.3V ENABLE Installed Installed Installed C9, C11 R5, R6 ENABLE Installed Removed Removed R11 R12 R22 R23 Installed(Shorted) Installed Removed Removed SYNC Removed Installed Removed Installed R8 Installed Installed Removed R17 R4 30.9K Installed R10 R3 5mOHM Short TP6 JP3 ENABLE R24 100K VIN C7 0.1uF C8 0.1uF 100K R2 RT SYNC SS2 SS1 PGOOD HICCUP C6 100uF 6.3V VIN C18 1uF (Optional) 100K R1 Removed 2 phasemode(single output) VIN JP1 HICCUP VIN C5 100uF 6.3V R16 Independent mode(dual output) C4 100uF 6.3V R15, R19 Designator Output Configuration Installed Removed C22, C24 Removed Installed Installed Removed Removed Type III Configuration C21, C23 Type II Configuration R25, R26, R27, R28 Designator C3 100uF 6.3V SHUNT SYNC RT ENABLE SS2 SS1 PGOOD HICCUP VIN B 1 2 A iP1201 JP2 * A/B *For Vin > 3.5V, remove jumper JP2. FB2S CC2 FB2 VSW2 VSW2S VREF VP-REF FB1S CC1 FB1 VSW1 VSW1S *For Vin < 3.5V, short A & B through JP2 jumper. A B JP3-1 C2 100uF 6.3V SHUNT Compensation Configuration †† VOUT2 VOUT1 VSW2S VSW1S PGNDS VINS PGND TP4 PGND TP2 VIN VIN=3.14V-5.5V VIN TP1 TP28 VIN JP2-1 1 2 SHUNT 1 2 JP1-1 VSW1S 4 PGND TP3 C22 NI FB2S CC2 FB2 VSW2 C24 NI VSW2S VREF VP-REF FB1S CC1 FB1 VSW1 C20 100pF R22 † 0 887 1% R13 R12 † 1K 1% 0 C21 NI R19 † NI C23 NI 2.15k 1% R10 R23 † 0 C16 470uF 6.3V 6.3V 6.3V 6.3V C15 470uF C13 470uF C12 470uF For VOUT2: R10 = R8[(VOUT2/VREF) - 1]. (2.5V) C26 NI VOUT2 C25 NI VOUT1 (1.5V) C17 0.1uF C14 0.1uF For parallel (single output) mode, check table on the left. Set R7 (or R8) to 1K, VREF to 0.8V, and VOUT to desired output, then solve for R9 (or R10 respectively). For VOUT1: R9 = R7[(VOUT1/VREF) - 1]. **For independent mode, output voltages are set by using the following equations: R8 1k 1% † R27 † † R15 5mOHM (short for independent output configuration) 5mOHM R17 † (short for independent 0 output configuration) TYPE III †† Compensation R16† L2 1.0uH 2.15K 1% R11† R6 7.15k TP10 VSW2 C10 100pF R4 † 0 NI R25 887 1% R9** R7** 1K 1% 1.0uH L1 R5 4.75K R14 1K 1% C11 6800pF R28 NI FB1S 0.8V C19 100pF C9 0.01uF R26 NI TP8 VSW1 TP18 PGND TP17 VOUT2 TP16 PGND TP15 VOUT1 PGND TP12 VOUT2 TP13 PGND TP22 PGND TP14 VOUT1 TP20 VOUT1 TP11 IRDCiP1201-A Fig. 6 - Reference Design Schematic www.irf.com IRDCiP1201-A Fig. 7 - Component Placement (Top View) SideLayer Fig. 8 - Component Placement (Bottom View) www.irf.com 5 IRDCiP1201-A IRDCiP1201-A (Dual, Independent output configurations(Channel1 1.5V output, Channel2 2.5V output) QTY 6 3 1 REF DESIGNATOR C1, C2, C3, C4, C5, C6 C10, C19,C20 C11 4 C12, C13, C15, C16 4 1 C14, C17, C7, C8 C18 C21, C22, C23, C24, C25, C26, R16, R17, R22, R23, R25, R26, R27, R28 C9 L1, L2 R1, R2, R24 R10, R11 R12, R14, R7, R8 R13, R9 R15, R19 R3 R4 R5 R6 U1 14 1 2 3 2 4 2 2 1 1 1 1 1 DESCRIPTION Capacitor, ceramic, 100µF, 6.3V, X5R, 20% Capacitor, ceramic, 100pF, 50V, NPO, 5% Capacitor, ceramic, 6800pF, 50V, X7R, 10% Capacitor, poscap, 470µF, 6.3V, electrolytic 20% Capacitor, ceramic, 0.1µF, 16V, X7R, 10% Capacitor, ceramic, 1.00µF, 16V, X7R, 10% SIZE 1812 0603 0603 MFR TDK Phycomp KOA PART NUMBER C4532X5R0J107M 0603CG101J9B20 X7R0603HTTD682K 7343 Sanyo 6TPB470M 0603 0805 Murata Murata GRM188R71C104KA01D GRM40X7R105K016 Not installed - - - Capacitor, ceramic, 0.01µF, 50V, X7R, 10% Inductor, 1µH, 19A, 20% Resistor, thick film, 100kΩ, 1/10W, 1% Resistor, thick film, 2.15kΩ, 1/10W, 1% Resistor, thick film, 1.0kΩ, 1/10W, 1% Resistor, thick film, 887Ω, 1/10W, 1% Resistor, manganin-foil, 0Ω, 2W Resistor, thick film, 30.9kΩ, 1/10W, 1% Resistor, thick film, 0Ω, 1/10W Resistor, thick film, 4.75kΩ, 1/10W, 1% Resistor, thick film, 7.15kΩ, 1/10W, 1% BGA Power Block 0603 13.0mm X 12.9mm 0603 0603 0603 0603 2716 0603 0603 0603 0603 9.25mm X 15.5mm Samsung Panasonic KOA KOA KOA KOA Isotek Corp KOA ROHM KOA KOA IR CL10B103KBNC ETQP1H1R0BFA RK73H1J1003F RK73H1J2151F RK73H1J1001F RK73H1J8870F SMT-R000 RK73H1J3092F MCR03EZHJ000 RK73H1JLTD4751F RK73H1JLTD7151F iP1201 MFR TDK Phycomp KOA PART NUMBER C4532X5R0J107M 0603CG101J9B20 X7R0603HTTD682K IRDCiP1201-A (Single, paralleled output configuration(for 1.5V output) QTY 6 3 1 REF DESIGNATOR C1, C2, C3, C4, C5, C6 C10, C19,C20 C11 4 C12, C13, C15, C16 4 1 C14, C17, C7, C8 C18 C21, C22, C23, C24, C25, C26, R10, R11, R12, R25, R26, R27, R28, R4, R8 C9 L1, L2 R1, R2, R24 R14, R7 R13, R9 R15, R19 R23 R3 R16, R17, R22 R5 R6 U1 15 1 2 3 2 2 2 1 1 3 1 1 1 DESCRIPTION Capacitor, ceramic, 100µF, 6.3V, X5R, 20% Capacitor, ceramic, 100pF, 50V, NPO, 5% Capacitor, ceramic, 6800pF, 50V, X7R, 10% Capacitor, poscap, 470µF, 6.3V, electrolytic 20% Capacitor, ceramic, 0.1µF, 16V, X7R, 10% Capacitor, ceramic, 1.00µF, 16V, X7R, 10% SIZE 1812 0603 0603 7343 Sanyo 6TPB470M 0603 0805 Murata Murata GRM188R71C104KA01D GRM40X7R105K016 Not installed - - - Capacitor, ceramic, 0.01µF, 50V, X7R, 10% Inductor, 1µH, 19A, 20% Resistor, thick film, 100kΩ, 1/10W, 1% Resistor, thick film, 1.0kΩ, 1/10W, 1% Resistor, thick film, 887Ω, 1/10W, 1% Resistor, alloy metal, 5mΩ, 1W, 1% Resistor, manganin-foil, 0Ω, 2W Resistor, thick film, 30.9kΩ, 1/10W, 1% Resistor, thick film, 0Ω, 1/10W Resistor, thick film, 4.75kΩ, 1/10W, 1% Resistor, thick film, 7.15kΩ, 1/10W, 1% BGA Power Block 0603 13.0mm X 12.9mm 0603 0603 0603 2512 2716 0603 0603 0603 0603 9.25mm X 15.5mm Samsung Panasonic KOA KOA KOA Panasonic Isotek Corp KOA ROHM KOA KOA IR CL10B103KBNC ETQP1H1R0BFA RK73H1J1003F RK73H1J1001F RK73H1J8870F ERJM1WSF5M0U SMT-R000 RK73H1J3092F MCR03EZHJ000 RK73H1JLTD4751F RK73H1JLTD7151F iP1201 Table 1 - Reference Design Bill of Materials 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. 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 6 www.irf.com