EV4570-F-00A 3A, 55V, Frequency programmable Step-Down Converter The Future of Analog IC Technology DESCRIPTION The EV4570-F-00A is an evaluation board for the MP4570/MPQ4570, a frequency programmable step-down switching converter with integrated internal high-side and low side power MOSFETs. It can provide 3A continuous output current with peak current control for excellent transient response and efficiency performance. The wide 4.5V to 55V input voltage range accommodates a variety of step down applications, including those applications in industrial, PoE, automotive and printer with DC high voltage bus. The valley current detection is used to avoid current running way at over current protection. Also it has accurate and reliable over voltage protection, and auto recovery thermal protection. In addition, the optional external soft start is available. Enable and power good indication function can be used to power track easily. In order to increase the efficiency, MP4570/MPQ4570 will automatically scaling down the switching frequency when load is light. Meanwhile, the low side MOSFET will be turned off to reduce driver loss when zero inductor current is detected. Synchronous operation mode with integrated low side MOSFET is much helpful to reduce the conduction loss and also beneficial to reduce external components space and save the cost. FEATURES • • • • • • • • • • • • Wide Input Voltage Range: 4.5V to 55V Programmable Switching Frequency Stable Independent on Output Capacitors Optional External Soft Start Peak Current Mode Control OCP Protection with Valley Current Detection Support External SYNC Clock OVP Protection Current Limit Decreasing during Output Short for Better Thermal Performance Power Good Indication Thermal Shutdown Protection Fully Assembled and Tested APPLICATIONS • • • • • PoE Input Non-isolated Buck Industrial Power Systems Printers and Scanners Automotive Power Systems 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. The MP4570/MPQ4570 is available in a TSSOP20 EP with exposed pad package. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units VIN 4.5-55 V Output Voltage VOUT 3.3 V Output Current IOUT 3 A Input Voltage EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 EV4570-F-00A – 3A, 55V, SYNCHRONOUS STEP DOWN CONVERTER EV4570-F-00A EVALUATION BOARD 100 95 90 85 80 75 70 65 60 (L x W x H) 2.5” x 2.5” x 0.2” (6.4cm x 6.4cm x0.5cm) Board Number MPS IC Number EV4570-F-00A MPQ4570GF 55 50 10 EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1000 2 EV4570-F-00A – 3A, 55V, SYNCHRONOUS STEP DOWN CONVERTER EVALUATION BOARD SCHEMETIC D1 R8 VIN GND 0 5 C3 0.1uF BST U1 4.5V~55V 6,7,8 C1A C1B C1C 2.2uF 2.2uF 0.1uF VIN SW L1 4 FB EN 10uH BIAS 17 C9 NS R5 100k 20 R10 102k FREQ COMP GND 3 SS VDD 13,14,15 16 C7 1uF AGND PG 3.3V@3A C2B C2C 22uF 0.1uF R1 R2 4.32k 1% BIAS PG C2A 22uF 2 R4 NS 18 VOUT 10,11 MPQ4570 R3 1M EN NS R11 10 VOUT R6 10k 1% NS R7 10 VOUT GND C6 NS BIAS BIAS 19 C5 1uF 1 R9 10k C4 47nF C8 220pF EV4570-F-00A BILL OF MATERIALS Qty Ref Value 2 C1A, C1B 2.2μF 1 C1C 0.1μF 2 C2A,C2B 22μF 2 C2C,C3 0.1μF 1 C4 47nF 2 C5,C7 1μF 1 C8 220pF 2 2 1 1 NS 10k 4.32k 1M 1 C6,C9 R1,R9 R2 R3 R4,R6, D1 R5 2 R7,R11 2 Description Ceramic Capacitor; 100V;X7R Ceramic Capacitor; 100V;X7R Ceramic Capacitor; 16V;X7R Ceramic Capacitor; 16V;X7R Ceramic Capacitor; 50V;X7R Ceramic Capacitor; 16V;X7R Ceramic Capacitor; 50V;C0G Package Manufacture Part Number 1210 muRata GRM32ER72A225KA35L 0603 muRata GRM188R72A104KA35D 1210 muRata GRM32ER71C226KE18L 0603 muRata GRM188R71C104KA01D 0603 muRata GRM188R71H473KA61D 0603 muRata GRM188R71C105KA12D 0603 muRata GRM1885C1H221JA01D Film Resistor;1%; Film Resistor;1%; Film Resistor;5%; 0603 0603 0603 Yageo Yageo Yageo RC0603FR-0710KL RC0603FR-074K32L RC0603JR-071ML 100k Film Resistor;1%; 0603 Yageo RC0603FR-07100KL 10 Film Resistor;1%; 0603 Yageo RC0603FR-0710RL NS EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 3 EV4570-F-00A – 3A, 55V, SYNCHRONOUS STEP DOWN CONVERTER EV4570-F-00A BILL OF MATERIALS (continued) Qty. Ref Value Description 1 1 R8 R10 0 102k 1 L1 10μH Film Resistor;5%; Film Resistor;1%; Inductor;5.8A; 25.4mohm DCR Inductor;5.2A; 30mohm DCR Step-Down Converter 1 4 11 U1 VIN, GND, GND, VOUT PG,GND, EN,GND, BIAS Package Manufacture 0603 0603 Yageo Yageo SMD ABC SMD Wurth 74437368100 TSSOP20-EP MPS MPQ4570GF 2.0 Golden Pin HZ 2.0mm Test Pin Any Part Number RC0603JR-070RL RC0603FR-07102KL CU1048100YEB EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 4 EV4570-F-00A – 3A, 55V, SYNCHRONOUS STEP DOWN CONVERTER EVB TEST RESULTS VIN = 48V, VOUT =3.3V, COUT = 2x22µF, L = 10µH, fSW=500kHz, TA = +25°C, unless otherwise noted. EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 5 EV4570-F-00A – 3A, 55V, SYNCHRONOUS STEP DOWN CONVERTER EVB TEST RESULTS VIN = 48V, VOUT =3.3V, COUT = 2x22µF, L = 10µH, fSW=500kHz, TA = +25°C, unless otherwise noted. EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 6 EV4570-F-00A – 3A, 55V, SYNCHRONOUS STEP DOWN CONVERTER EVB TEST RESULTS (continued) VIN = 48V, VOUT =3.3V, COUT = 2x22µF, L = 10µH, fSW=500kHz, TA = +25°C, unless otherwise noted. VIN 5V/div. VIN 5V/div. VOUT 1V/div. IL 1A/div. VSW 10V/div. VOUT 2V/div. IL 1A/div. VSW 10V/div. EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 7 EV4570-F-00A – 3A, 55V, SYNCHRONOUS STEP DOWN CONVERTER PRINTED CIRCUIT LAYOUT Figure1 – Top Silk Layer Figure 2 – Top Layer Figure3 – Inner Layer 1 Figure 4 – Inner Layer 2 Figure5 – Bottom Layer EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 8 EV4570-F-00A – 3A, 55V, SYNCHRONOUS STEP DOWN CONVERTER 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 4.5V to 55V, 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 MP4570/MPQ4570GF will automatically startup. 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, drive EN less than 1.3V to turn it off. There is no internal pull-up or pull-down circuit, so do not float this pin. 6. Connection the EN pin directly to a voltage source without any pull-up resistors requires limiting voltage amplitude to ≤6V to prevent damage to the internal zener diode between EN and GND; EN pin can also be connected to higher voltage (e.g. VIN) through pull-up resistor, but need to make sure the pull-up reisistor is high enough to make sure the sink current into EN pin less than 150μA to avoid damaging the zener diode. For example, when connecting EN to VIN=12V, Rpull-up≥ (12V – 6.5V) ÷ 150µA = 37kΩ. 7. Use R10 to re-program switching frequency if needed. The recommended RFREQ values for various fsw please see Table 1. Table 1 — fSW vs. RFREQ fSW (kHz) RFREQ (kΩ) 1000 900 800 700 600 500 400 300 200 100 47.5 56 63.4 73.2 84.5 102 133 178 261 523 8. Use R1 and R2 to set the output voltage with VFB=1V. For R1=10kΩ, R2 can be determined by: R2 = 10 VOUT − 1 kΩ Follow the Application Information section in the device datasheet to recalculate the compensation, inductor and output capacitor values when output voltage is changed. 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. EV4570-F-00A Rev.1.0 www.MonolithicPower.com 8/8/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 9