EVQ2451-G-00A 0.6A, 2MHz, 36V Step-Down Converter Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The EVQ2451-G-00A is an evaluation board for the MPQ2451, a fixed 2MHz frequency stepdown switching regulator with an integrated internal high-side high voltage power MOSFET. The IC provides 0.6A output with current mode control for fast loop response and easy compensation. • • • • High power conversion efficiency over a wide load range is achieved by scaling down the switching frequency at light load condition to reduce the switching and gate driving losses. The soft-start function helps prevent inductor current runaway during startup and thermal shutdown provides reliable, fault tolerant operation. By switching at 2MHz, smaller value inductor and input/output capacitor can be used to lower down cost and save board space. Wide Operating Input Range Fixed 2MHz Switching Frequency 0.6A Output Current Up to 90% Efficiency APPLICATIONS • • • • • High Voltage Power Conversion Automotive Systems Industrial Power Systems Distributed Power Systems Battery Powered Systems All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 8-36 5 0-0.6 V V A EVQ2451-G-00A EVALUATION BOARD Efficiency 95 VOUT=5V VIN=8V 90 EFFICIENCY (%) 85 VIN=24V 80 VV ININ =12V =12V 75 70 VIN=36V 65 60 55 (L x W x H) 1.8” x 1.8” x 0.4” 4.6cm x 4.6cm x 1.0cm Board Number MPS IC Number EVQ2451-G-00A MPQ2451-G 50 0.01 0.1 1 OUTPUT CURRENT(A) EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 4/1/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 EVQ2451-G-00A – 0.6A, 2MHz, 36V STEP-DOWN CONVERTER EVALUATION BOARD SCHEMATIC D3 U1 2 VIN 6 BST VIN MPQ2451 C3 100nF GND NS SW R5 100k 3 EN EN C4 NS R4 26.1k 1 D2 NS R6 0 C7 100nF D1 B140 FB 4 5 R1 23.7k R2 124k R3 0 C6 100nF VOUT GND C8 33pF EVQ2451-G-00A BILL OF MATERIALS Qty Ref Value 2 C1, C2 4.7μF Description Ceramic Cap., 50V, 10%, X7R Ceramic Cap., 50V, 10%, X7R Package Manufacturer Manufacturer P/N 1210 muRata GRM32ER71H475KA88L 0603 muRata GCJ188R71H104KA12D 1206 muRata GRM31CR71C106KAC7L SMA Diodes Inc B140-13-LF 2 C3,C6, C7 C4, C8 1 C5 10μF 1 D1 B140 2 D2, D3 NS 1 L1 3.3μH Inductor, Idc=2.15A, Rdc=30mohm SMD 5x5mm Wurth WE-744043003 1 R1 23.7KΩ Film Res., 1% 0603 Yageo RC0603FR-0723K7KL 1 R2 124KΩ Film Res., 1% 0603 Yageo RC0603FR-07124KL 1 R3 NS 1 R4 26.1KΩ Film Res., 1% 0603 Yageo RC0603FR-0726K1KL 1 R5 100KΩ Film Res., 1% 0603 Yageo RC0603FR-07100KL 1 R6 0 Film Res., 5% 0603 Yageo RC0603JR-070RL Power Led Driver QFN6L2X2mm MPS MPQ2451DQ Power Test Point 2.3mm HZ China market 3x2.54mm Test Point 3x2.54mm Sullins PCC03SAAN 3 1 4 1 U1 VIN, GND, VOUT, GND EN, GND 0.1μF NS MPQ2451DQ Ceramic Cap., 16V, 10%, X7R Schottky Rect., 40V,1A EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 4/1/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 EVQ2451-G-00A – 0.6A, 2MHz, 36V STEP-DOWN CONVERTER EVB TEST RESULTS Frequency vs. Junction Temperature Current Limit vs. Junction Temperature 1.5 2.20 1.4 2.15 D=30% Voltage Reference vs. Junction Temperature 0.810 0.805 2.10 1.3 0.800 2.05 1.2 2.00 1.1 0.795 1.95 1.0 0.790 1.90 0.9 0.785 1.85 0.8 -50 -25 0 25 50 75 100 125 1.80 -50 -25 0 25 50 75 100 125 0.780 -50 -25 0 25 50 75 100 125 Efficiency 95 VOUT=5V VIN=8V 90 EFFICIENCY (%) 85 VIN=24V 80 VV ININ =12V =12V 75 70 VIN=36V 65 60 55 50 0.01 0.1 1 OUTPUT CURRENT(A) EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 4/1/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 3 EVQ2451-G-00A – 0.6A, 2MHz, 36V STEP-DOWN CONVERTER PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 4/1/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 4 EVQ2451-G-00A – 0.6A, 2MHz, 36V STEP-DOWN CONVERTER QUICK START GUIDE 1. Connect the positive terminal of the load to VOUT pins, and the negative terminal of the load to GND pins. 2. Preset the power supply output to 12V and turn off the power supply. 3. Connect the positive terminal of the power supply output to the VIN pin and the negative terminal of the power supply output to the GND pin. 4. Turn on the power supply. The EVQ2451 will automatically start up. 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 1.6V to turn on the regulator or less than 1.2V to turn it off. Note that floating the EN pin will turn it off. 6. An input under-voltage lockout (UVLO) function is implemented by the addition of a resistor divider (R4 and R6). The EN threshold is 1.2V (falling edge), so the input UVLO threshold is: ⎛ ⎝ UVLO = 1.2V × ⎜ 1+ R6 ⎞ ⎟ R4 ⎠ The UVLO threshold is preset to 6V on this board. 7. To adjust the output voltage, change the values of R1 and R2. Generally, Choose R2 around 124kΩ for optimal transient response. For VFB=0.8V, R2=124kΩ, R1 can be determined by: R1 = 99.2kΩ VOUT -0.8V Please follow the application information on the MP2451 datasheet to recalculate/select compensation values, the inductor value and the output capacitor value if the output voltage needs to be reprogrammed. NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 4/1/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 5