EV2905-K-01A 1.2V, 10A, 300kHz, Hysteretic Synchronous Step-Down Controller Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV2905-K-01A is the evaluation board for the MP2905EK, a hysteretic synchronous stepdown controller. It offers a very compact solution to achieve 1.2V, 10A continuous output current from a 10.8V to 13.2V input voltage range over a wide operation input voltage. An adjustable soft-start prevents inrush current at turn-on. Hysteretic voltage control can provide fast transient without any loop compensation. Full protection features include OCP, output OVP, thermal shut down. APPLICATIONS The EV2905-K-01A frequency is approximately 300kHz (12V input). Peak Current limit is set at 15A. The efficiency is up to 90% (12V input) with the supplied components. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units VIN 10.8 - 13.2V V VOUT 1.2 V Input Voltage Output Voltage Load Current IOUT 10 (1) 10A Output Current,1.2V Output Voltage Programmable Soft-Start Hiccup Current Limit and Thermal Shutdown Monotonic Startup into Prebias Output Startup Overvoltage Protection Enable/Shutdown Motherboard Power Supplies AGP and PCI-Express Power Supplies Graphic-Card Power Supplies Set-Top Boxes Point-of-Load Power Supplies Notes: 1) Circuit can work up to about 10A over a wide input voltage range. This EVB shows the performance at 12V input. So the frequency and current limit are designed for the 12V application “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. A EV2905-K-01A EVALUATION BOARD Efficiency VIN=12V, VOUT=1.2V 100 90 80 70 60 50 40 30 20 (L x W x H) 2.5” x 2.5” x 0.63” (6.3cm x 6.3cm x 1.6cm) Board Number MPS IC Number EV2905-K-01A MP2905EK 10 0 0 2 4 6 8 10 IOUT(A) EV2905-K-01A Rev. 1.0 www.MonolithicPower.com 12/7/2017 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2017 MPS. All Rights Reserved. 1 EV2905-K-01A HYSTERETIC SYNCHRONOUS STEP-DOWN CONTROLLER EV BOARD EVALUATION BOARD SCHEMATIC z C13 NS C6 1uF C9 R13 C1D 0.1uF C11 NS 3K R8 0 R4 NS R5 NS R6 0 Q3 C10 4.7uF D2 0520 0.82uH R7 20K R11 C12 NS C2D 330uF 0.1uF R9 R10 0 R12 EV2905-K-01A Rev. 1.0 www.MonolithicPower.com 12/7/2017 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2017 MPS. All Rights Reserved. 2 EV2905-K-01A HYSTERETIC SYNCHRONOUS STEP-DOWN CONTROLLER EV BOARD EV2905-K-01A BILL OF MATERIALS Qty RefDes Value 2 C1A,C1B 22µF 2 C2A,C2B 22µF 1 C2C 330µF 2 C1D,C2D 0.1µF 2 C3,C5 10nF 1 C4 4.7µF 1 C6 1µF 1 C7 0.1µF 1 C8 3.9nF 1 C9 2.2nF 1 C10 2.2µF NS NS 1.05kΩ 1kΩ 3kΩ NS 1 2 1 1 C11 C12,C13 R1 R2 R3 R4,R5 R6,R8 R9,R11 R7 R10,R12 R13 D1 1 D2 1 L1 2 Q1,Q2 1 Q3 1 U1 1 1 1 4 0Ω 20kΩ 2Ω 52.3kΩ 0.82µH MP2905 Description Ceramic Cap, 25V Ceramic Cap, 16V Poscap, 6.3V Ceramic Cap, 25V Ceramic Cap, 50V Ceramic Cap, 6.3V Ceramic Cap, 25V Ceramic Cap, 50V Ceramic Cap, 50V Ceramic Cap, 50V Ceramic Cap, 10V Package Manufacturer 1210 muRata GRM32ER61E226KE15L 1210 muRata GRM32ER61C226KE20L Poscap Sanyo 0603 muRata GRM188R71E104KA01D 0603 muRata GRM188R71H103KA01D 0603 muRata GRM188R60J475KE19D 0603 muRata GRM188R71E105KA12D 0603 muRata GRM188R71H104KA93D 0603 muRata GRM188R71H392KA01D 0603 muRata GRM1885R71H222A01D 0603 muRata GRM188R71A225KE15D Film Res, 1% Film Res, 1% Film Res, 1% 0603 0603 0603 ROYAL ROYAL ROYAL RL0603FR-071K05L RL0603FR-071KL RL0603FR-03KL Film Res, 1% 0603 Yageo RC0603FR-070RL 0603 0603 0603 SOD123 ROYAL Yageo ROYAL Diodes RL0603FR-0720KL RL0603FR-072RL RL0603FR-0752K3L B0540W SOD323 Diodes B0520LW-7-F SMT Wruth 744355182 PowerPAK SO-8 Analog Power AM7432N SOT-23 Diodes MSOP10 MPS X5R, X5R, X7R, X7R, X5R, X7R, X7R, X7R, X7R, X7R, Film Res, 1% Film Res, 1% Film Res, 1% B0540W,40V,0.5A B0520LW-7F,20V,0.5A Inductor,Rated current=27A,Saturation current=35A,DCR=0.9 mΩ AM7432N,30V,27A,Rd s_on=4.9mΩ@4.5Vgs, Qg=25nC,tr=13ns,tf=43 [email protected] 2N7002(60V,115mA) Synchronous Step-Down Controller Manufacturer P/N 6TPE330MIL 2N7002(60V,115mA) MP2905EK EV2905-K-01A Rev. 1.0 www.MonolithicPower.com 12/7/2017 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2017 MPS. All Rights Reserved. 3 EV2905-K-01A HYSTERETIC SYNCHRONOUS STEP-DOWN CONTROLLER EV BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Inner 1 Layer Figure 4—Inner 2 Layer Figure 5—Bottom Layer EV2905-K-01A Rev. 1.0 www.MonolithicPower.com 12/7/2017 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2017 MPS. All Rights Reserved. 4 EV2905-K-01A HYSTERETIC SYNCHRONOUS STEP-DOWN CONTROLLER EV BOARD QUICK START GUIDE 1. Stuff multi-strand wire in VOUT, VOUT_GND pad and single strand wire in VIN, VIN_GND pad. 2. Connect the positive terminal of the load to VOUT multi-strand wire, and the negative terminal of the load to GND multi-strand wire. 3. Preset the power supply output to 12V and turn it off. 4. Connect the positive terminal of the power supply output to the VIN wire and the negative terminal of the power supply output to the GND wire. 5. Connect the EN pin to GND. 6. Turn the power supply on. The MP2905EK will automatically startup. 7. To use the Enable function, drive EN higher than 4V to turn on the MOS Q3, then SS is pulled down, part shuts down. Drive EN less than 0.5V to turn off the MOS Q3, then SS is released, part turns on. Do not float EN pin. 8. The output voltage VOUT can be programmed by R1 and R2. Calculate the new value using the formula: R1 R2 ( VOUT 1) VFB Where VFB=0.59V. In order to get good transient, R1 and R2 should be small enough. Always set R2=1kΩ or smaller, and R1 is not higher than 3 kΩ. 9. The frequency is set by C9 and R13. C9 should not be small enough to get good transient response, 2.2nF is recommended , then R13 is used to program the frequency by formula below: Vout ( VIN VOUT ) VIN (90ns VIN 20ns VOUT ) f R13 VIN C 9 VHY Where VHY is output regulation hysteresis, typical value is 22mV. 10. The EV board is designed for 12V input, 1.2Vout application. So, for other application, some parameters such as current limit and frequency need to be redesigned. Please refer to AN023 to set related parameters. 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. EV2905-K-01A Rev. 1.0 www.MonolithicPower.com 12/7/2017 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2017 MPS. All Rights Reserved. 5