EV4570-F-01A 3A, 55V, Frequency Programmable Step-Down Converter DESCRIPTION FEATURES The EV4570-F-01A 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. N O • • • • • • F 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. S P M C T O The MP4570/MPQ4570 is available in a TSSOP20 EP with exposed pad package. • • • T 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 N E D I • • • L A I The Future of Analog IC Technology T APPLICATIONS • • • • • R U B I PoE Input Non-isolated Buck Industrial Power Systems Printers and Scanners Automotive Power Systems Distributed Power Systems S I T All MPS parts are lead-free, halogen 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. D ELECTRICAL SPECIFICATIONS Parameter Input Voltage N Symbol Value Units VIN 4.5-55 V O Output Voltage VOUT 3.3 Output Current IOUT 3 D E V A EV4570-F-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 1 EV4570-F-01A – 3A, 55V, SYNCHRONOUS STEP-DOWN CONVERTER L EV4570-F-01A EVALUATION BOARD S P M N O F E C O D T O 90 N D I (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-01A MPQ4570GF 85 80 75 70 65 60 55 50 10 1000 R T S I D A I T 100 95 E T U B I N EV4570-F-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 2 EV4570-F-01A – 3A, 55V, SYNCHRONOUS STEP-DOWN CONVERTER L EVALUATION BOARD SCHEMETIC D1 0 VIN C1A C1B C1C 2.2uF 2.2uF 0.1uF GND BST 6,7,8 VIN 4 SW MP4570 R3 1M EN C3 0.1uF 5 U1 4.5V-55V FB EN BIAS 20 R2 4.32k 1% 17 N O E R11 10 D I COMP F GND R10 102k FREQ AGND 3 SS VDD 13,14,15 16 C7 1uF C2A 22uF 19 1 R9 5.1k C4 1nF C2B C2C 22uF 0.1uF N 2 C9 NS R5 100k PG VOUT 10uH BIAS PG T L1 10,11 R4 NS 18 A I NS R8 VOUT R1 R6 10k 1% 0 Value 2 C1A, C1B 2.2μF 1 C1C S P M 2 C2A,C2B 22μF 2 C2C,C3 0.1μF 1 C4 1nF 2 C5,C7 1μF 1 C6 330pF 1 C8 220pF 1 1 1 1 1 1 2 C9 R1 R2 R3 R4 R5 R6,R8 NS 10k 4.32k 1M NS 100k 0 C6 BIAS T C5 1uF C8 220pF U B I GRM32ER71C226KE18L muRata GRM188R71C104KA01D muRata GRM188R71H102KA01D 0603 muRata GRM188R71C105KA12D 0603 muRata GRM1885C1H331JA01D 0603 muRata GRM1885C1H221JA01D Film Resistor;1%; Film Resistor;1%; Film Resistor;5%; 0603 0603 0603 Yageo Yageo Yageo RC0603FR-0710KL RC0603FR-074K32L RC0603JR-071ML Film Resistor;1%; Film Resistor;5%; 0603 0603 Yageo Yageo RC0603FR-07100KL RC0603JR-070RL Package Manufacturer 1210 muRata T O N 1210 D 0603 0603 T S I 0603 E BIAS muRata O D GND muRata 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 Ceramic Capacitor;50V;C0G 0.1μF VOUT R C Ref R7 10 330pF EV4570-F-01A BILL OF MATERIALS Qty 3.3V@3A Part Number GRM32ER72A225KA35L GRM188R72A104KA35D EV4570-F-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 3 EV4570-F-01A – 3A, 55V, SYNCHRONOUS STEP-DOWN CONVERTER L EV4570-F-00A BILL OF MATERIALS (continued) Qty Ref Value Description 2 1 1 1 R7,R11 R9 R10 D1 10 5.1k 102k NS Film Resistor;1%; Film Resistor;1%; Film Resistor;1%; 1 1 4 11 L1 10μH Inductor;5.8A;25.4mohm DCR Inductor;5.2A;30mohm DCR Synchronous Step-Down Converter U1 VIN, GND, GND, VOUT PG,GND, EN,GND, BIAS S P M N O Manufacturer 0603 0603 0603 Yageo Yageo Yageo SMD E TSSOP20 F C O D T O T ABC RC0603FR-0710RL RC0603FR-075K1L RC0603FR-07102KL CU1048100YEB Wurth 74437368100 MPS MPQ4570GF HZ E T Any R T S I D Part Number A I N SMD D I 2.0 Golden Pin 2.54mm Test Pin Package U B I N EV4570-F-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 4 EV4570-F-01A – 3A, 55V, SYNCHRONOUS STEP-DOWN CONVERTER L EVB TEST RESULTS A I VIN = 48V, VOUT =3.3V, COUT = 2x22µF, L = 10µH, fSW=500kHz, TA = +25°C, unless otherwise noted. S P M N O N E D I F C O D T O T T R T S I D E U B I N EV4570-F-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 5 EV4570-F-01A – 3A, 55V, SYNCHRONOUS STEP-DOWN CONVERTER L EVB TEST RESULTS A I VIN = 48V, VOUT =3.3V, COUT = 2x22µF, L = 10µH, fSW=500kHz, TA = +25°C, unless otherwise noted. EN 2V/div. EN 2V/div. VOUT 2V/div. IL 1A/div. VOUT 2V/div. IL 2A/div. N O VOUT 2V/div. IL 2A/div. SW 20V/div. P M S C VOUT 2V/div. E D I SW 20V/div. VOUT 1V/div. N F T VOUT 2V/div. IL 1A/div. SW 20V/div. R T S I IL 500mA/div. SW 20V/div. T O T VOUT 2V/div. IL 1A/div. D E U B I VOUT/AC 100mV/div. IL 2A/div. O SW 20V/div. D N IOUT 1A/div. EV4570-F-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 6 EV4570-F-01A – 3A, 55V, SYNCHRONOUS STEP-DOWN CONVERTER L 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. S P M N O E C O D T O T N D I F A I T R T S I D E U B I N EV4570-F-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 7 EV4570-F-01A – 3A, 55V, SYNCHRONOUS STEP-DOWN CONVERTER L PRINTED CIRCUIT LAYOUT S P M N O F E C D T R E T Figure 2 – Top Layer S I Figure3 – Inner Layer 1 O T N D I Figure1 – Top Silk Layer A I U B I Figure 4 – Inner Layer 2 T O D N Figure5 – Bottom Layer EV4570-F-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 8 EV4570-F-01A – 3A, 55V, SYNCHRONOUS STEP-DOWN CONVERTER L QUICK START GUIDE 1. Connect the positive and negative terminals of the load to the VOUT and GND pins respectively. A I 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. T 4. Turn the power supply on. The MP4570/MPQ4570GF will automatically startup. N 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. E 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. D I F T U B I 7. Use R10 to re-program switching frequency if needed. The recommended RFREQ values for various fsw please see Table 1. N O Table 1 — fSW vs. RFREQ S P M 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 C T O R T S I D 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 N Follow the Application Information section in the device datasheet to recalculate the compensation, inductor and output capacitor values when output voltage is changed. O D E 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-01A Rev.1.0 www.MonolithicPower.com 4/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 9