EV4423-Q-00A 3A, 36V, Synchronous Step Down Converter Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV4423-Q-00A is an evaluation board for the MP4423/MPQ4423, a high-frequency, synchronous, rectified, step-down, switch-mode converter with build-in power MOSFETs. It offers a very compact solution to achieve a 3A continuous output current with excellent load and line regulation over a wide input supply range. The MP4423/MPQ4423 has synchronous mode operation for higher efficiency over the output current load range. Current-mode operation provides fast transient response and eases loop stabilization. Full protection features include over-current protection and thermal shut down. The EV4423-Q-00A uses a minimal number of readily-available standard components, and is assembled and tested in space-saving QFN-8 (3mmx3mm) package. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol Wide 4V to 30V Continuous Operating Input Range 36V Input Transient Tolerance for Automotive Load Dump 85mΩ/55mΩ Low RDS(ON) Internal Power MOSFETs High-Efficiency Synchronous Mode Operation Default 410kHz Switching Frequency Synchronizes to a 200kHz to 2.2MHz External Clock High Duty Cycle for Automotive Cold-crank Power-Save Mode Internal Soft-Start Power Good OCP Protection and Hiccup Thermal Shutdown Output Adjustable from 0.8V Available in an QFN-8 (3mmx3mm) package Fully assembled and tested Value 4-30(Continuous)/ 36(Transient) Units V APPLICATIONS VOUT 3.3 V IOUT 3 A VIN Automotive Industrial Control System Distributed Power Systems All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. EV4423-Q-00A EVALUATION BOARD (L x W x H) 2.5” x 2.5” x 0.2” (6.35cm x 6.35cm x0.5cm) Board Number MPS IC Number EV4423-Q-00A MPQ4423GQ EV4423-Q-00A Rev.1.0 www.MonolithicPower.com 12/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 EV4423-Q-00A – 3A, 36V, SYNCHRONOUS STEP DOWN CONVERTER EVALUATION BOARD 5 GND 2 3 EVALUATION BOARD SCHEMETIC EV4423-Q-00A Rev.1.0 www.MonolithicPower.com 12/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 2 EV4423-Q-00A – 3A, 36V, SYNCHRONOUS STEP DOWN CONVERTER EVALUATION BOARD EV4423-Q-00A BILL OF MATERIALS Qty Ref Value 2 C1A,C1B 10μF 1 C1C 0.1μF 2 C2A,C2B 22μF 3 C2,C2C,C3 0.1μF 1 C4 33pF 1 1 1 CIN1,CIN2, CIN3,CIN4, CIN5,COUT1 D1 FB1 L1 NS NS NS 1 L2 10μH 1 2 1 1 1 1 1 1 1 2 R1 R3,R9 R4 R5 R6 R7 R8 R10 R12 R2,R11 1M 100k 20 51k 10 41.2k 13k 20k 1k NS 1 Q1 1 U1 6 5 5 VIN, VEMI, GND, VOUT, GND EN/SYNC, GND,PG, GND, CLK_OUT Description Ceramic Cap., 50V, X7R Ceramic Cap., 50V, X7R Ceramic Cap., 16V, X7R Ceramic Cap., 16V, X7R Ceramic Cap., 50V, C0G Package Manufacture Part Number 1210 muRata GRM32ER71H106KA12L 0603 muRata GRM188R71H104KA93D 1210 muRata GRM32ER71C226KE79 0603 muRata GRM188R71C104KA01D 0603 muRata GRM1885C1H330JA01D SMD Coilcraft XAL5050-103ME 0603 0603 0603 0603 0603 0603 0603 0603 0603 Yageo Yageo Yageo Yageo Yageo Yageo Yageo Yageo Yageo SOT-23 ON Semiconductor QFN3X3 -8 MPS NS Inductor, 40.9mOhm DCR, 4.9A Film Res., 5% Film Res., 1% Film Res., 1% Film Res., 1% Film Res., 1% Film Res., 1% Film Res., 1% Film Res., 1% Film Res., 1% Transistor, 40V, 0.2A Step-Down Regulator 2.0 Golden Pin HZ 1.0 Golden Pin HZ RC0603JR-071ML RC0603FR-07100KL RC0603FR-0720RL RC0603FR-0751KL RC0603FR-0710RL RC0603FR-0741K2L RC0603FR-0713KL RC0603FR-0720KL RC0603FR-071KL MMBT3904LT1 MPQ4423GQ EV4423-Q-00A Rev.1.0 www.MonolithicPower.com 12/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 3 EV4423-Q-00A – 3A, 36V, SYNCHRONOUS STEP DOWN CONVERTER EVALUATION BOARD EVB TEST RESULTS VIN = 12V, VOUT =3.3V, COUT = 2x22µF, L = 10µH, TA = +25C, unless otherwise noted. EV4423-Q-00A Rev.1.0 www.MonolithicPower.com 12/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 4 EV4423-Q-00A – 3A, 36V, SYNCHRONOUS STEP DOWN CONVERTER EVALUATION BOARD EVB TEST RESULTS (continued) VIN = 12V, VOUT =3.3V, COUT = 2x22µF, L = 10µH, TA = +25C, unless otherwise noted. EV4423-Q-00A Rev.1.0 www.MonolithicPower.com 12/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 5 EV4423-Q-00A – 3A, 36V, SYNCHRONOUS STEP DOWN CONVERTER EVALUATION BOARD EVB TEST RESULTS (continued) VIN = 12V, VOUT =3.3V, COUT = 2x22µF, L = 10µH, TA = +25C, unless otherwise noted. VIN 5V/div. VIN 5V/div. VOUT 2V/div. IL 2A/div. VOUT 2V/div. IL 2A/div. VSW 10V/div. VSW 10V/div. VEN 2VA/div. VPG 5V/div. VOUT 2V/div. VSW 5V/div. VEN 2VA/div. VPG 5V/div. VOUT 2V/div. VSW 5V/div. VSW 5V/div. VCLK_OUT 2V/div. EV4423-Q-00A Rev.1.0 www.MonolithicPower.com 12/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 6 EV4423-Q-00A – 3A, 36V, SYNCHRONOUS STEP DOWN CONVERTER EVALUATION BOARD PRINTED CIRCUIT LAYOUT Figure1 – Top Silk Layer Figure 2 – Top Layer Figure3 – Inner Layer 1 Figure 4 – Inner Layer 2 Figure5 – Bottom Layer Figure 6 – Bottom Silk Layer EV4423-Q-00A Rev.1.0 www.MonolithicPower.com 12/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 7 EV4423-Q-00A – 3A, 36V, SYNCHRONOUS STEP DOWN CONVERTER EVALUATION BOARD QUICK START GUIDE 1. Connect the positive and negative terminals of the load to the VOUT and GND pins respectively. 2. Preset the power supply output to between 4V to 30V and then turn it off. 3. Connect the positive and negative terminals of the power supply output to the VIN and GND pins respectively. 4. Turn the power supply on. The MP4423/MPQ4423 will automatically startup. 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 1.65V to turn on the regulator, drive EN less than 1.05V to turn it off. 6. Connect the EN input pin through a pull-up resistor to any voltage connected to the VIN pin. Make sure the pull-up resistor big enough to limit the EN input current to less than 150μA. For example, with 12V connected to VIN, RPULLUP ≥ (12V – 6.5V) ÷ 150μA = 36.7kΩ. 7. Connect the EN pin directly to a voltage source without any pull-up resistor requires limiting voltage amplitude to ≤6V to prevent damage to the Zener diode. 8. Connect the EN input pin with an external clock with a range of 200kHz to 2.2MHz after output voltage is set to synchronize the internal clock rising edge to the external clock rising edge. The pulse width of external clock signal should be less than 1.7μs. 9. Use R7 and R8 to set the output voltage with VFB=0.792V. For R7=41.2kΩ, R8 can be determined by: R8 0.792*41.2 kΩ VOUT 0.792 Follow the Application Information section in the device datasheet to recalculate the compensation, inductor and output capacitor values when output voltage is changed. 10. CLK_OUT is a signal inverted to SW and can be used as other buck’s sync signal to get 180 degree out of phase. The high voltage of CLK_OUT is equal to the output voltage of the board, so make sure it is safe for the synchronized part when the output voltage setting value is high. NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. 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. EV4423-Q-00A Rev.1.0 www.MonolithicPower.com 12/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 8