EV2131-G-00A 4A, 5.5V, 1.2MHz Synchronous Step-Down Switcher Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV2131-G-00A is used for demonstrating the performance of MPS’s MP2131, a low voltage high switching frequency step-down switcher with built in power MOSFETs. MP2131 provides up to 4A highly efficient output with constant-on-time control for fast loop response. • • • • • • • • • • • MP2131 is ideal for powering portable equipment that runs from a single cell Lithiumion (Li+) Battery. The output voltage can be regulated as low as 0.6V. High power efficiency over a wide load range is achieved by scaling down the switching frequency at light load to reduce the switching related loss by constant on time control. Short circuit and thermal shutdown provides reliable, fault-tolerant operation. MP2131 is available in QFN12 (2x2mm) package. ELECTRICAL SPECIFICATION Parameter Input Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 2.7– 5.5 1.2 4 V V A • • Wide 2.7V to 5.5V Operating Input Range Up to 4A Output Current 19μA Quiescent Current 32mΩ and 17mΩ Internal Power MOSFET 1.2MHz CCM Switching Frequency EN and Power Good for Power Sequencing Cycle-by-Cycle Over Current Protection Auto Discharge at Power Off Short Circuit Protection with Hiccup Mode Thermal Shutdown Stable with Low ESR Ceramic Output Capacitors Internal Soft-Start Available in a QFN12 (2x2mm) Package APPLICATIONS • • • • Storage Drives Portable/Handheld Devices Wireless/Networking Cards Low Voltage I/O System Power 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. ADAM (Analog Digital Adaptive Modulation), AAM (….) areTrademarks of Monolithic Power Systems, Inc. The MP#### is covered by US Patents #,###,###, #,###,###, #,###,###. EV2131-G-00A EVALUATION BOARD I Board Number MPS IC Number EV2131-G-00A MP2131GG 100 95 90 85 80 75 70 65 60 55 50 45 40 0.01 VOUT=3.3V VOUT=1.2V 0.1 1 OUTPUT CURRENT (A) EV2130DG-01A Rev.1.0 www.MonolithicPower.com 11/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 10 1 EV2131-G-00A – 4A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER EVALUATION BOARD SCHEMATIC EV2131-G-00A BILL OF MATERIALS Qty RefDes 1 C1A,C2A, C3,C4 C1 22μF 1 C2 10μF 1 L1 R1 R2 R3 R4,R5 1.0μH NS 100k NS 200k 1 2 1 U1 Value Description Package Manufacturer Manufacturer P/N NS Ceramic Cap., 10V, 20%, X5R Ceramic Cap., 6.3V, 10%, X5R Inductor, IS= 9A, DCR=27mΩ 0805 Film Res., 5% Film Res., 5% Synchronous MP2131 switcher Step-Down Taiyo Yuden LMK212BJ226MG-T 0805 muRata SMD Wurth 74437324010 0603 Yageo RC0603JR-07100KL 0603 QFN122x2mm Yageo RC0603JR-07200KL MPS GRM21BR70J106KE76L MP2131GG EV2130DG-01A Rev.1.0 www.MonolithicPower.com 11/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 2 EV2131-G-00A – 4A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN = 5V, VOUT = 1.2V, L = 1.0µH, TA = 25ºC, unless otherwise noted. Start up through Input Voltage Shutdown through Input Voltage Start up through Input Voltage IOUT= 0A IOUT= 0A IOUT= 4A VOUT 500mV/div. VOUT 500mV/div. VOUT 500mV/div. VIN 2V/div. VSW 2V/div. VIN 2V/div. VSW 2V/div. VIN 2V/div. VSW 2V/div. IINDUCTOR 1A/div. IINDUCTOR 500mA/div. IINDUCTOR 5A/div. Shutdown through Input Voltage Start up through Enable Shutdown through Enable IOUT= 4A IOUT= 0A IOUT= 0A VOUT 500mV/div. VIN 2V/div. VSW 2V/div. IINDUCTOR 5A/div. VOUT 500mV/div. VEN 5V/div. VOUT 500mV/div. VEN 5V/div. VSW 2V/div. VSW 5V/div. IINDUCTOR 1A/div. IINDUCTOR 1A/div. Start up through Enable Shutdown through Enable IOUT= 4A IOUT= 4A VOUT 500mV/div. VEN 5V/div. VOUT 500mV/div. VEN 5V/div. VSW 2V/div. VSW 5V/div. IINDUCTOR 5A/div. IINDUCTOR 5A/div. Output Ripple IOUT= 0A VOUT/AC 50mV/div. VSW 2V/div. IINDUCTOR 1A/div. EV2130DG-01A Rev.1.0 www.MonolithicPower.com 11/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 3 EV2131-G-00A – 4A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 5V, VOUT = 1.2V, L = 1.0µH, TA = 25ºC, unless otherwise noted. Output Ripple Output Ripple Output Ripple IOUT= 4A VIN=3.6V, VOUT=3.3V, IOUT= 0A VIN=3.6V, VOUT=3.3V, IOUT= 0.1A VOUT/AC 10mV/div. VOUT/AC 100mV/div. VOUT/AC 100mV/div. VSW 2V/div. VSW 2V/div. VSW 2V/div. IINDUCTOR 500mA/div. IINDUCTOR 500mA/div. IINDUCTOR 2A/div. Short Circuit Steady State VOUT 1V/div. VSW 2V/div. IINDUCTOR 5A/div. Short Circuit Entry Short Circuit Recovery IOUT= 0A IOUT= 0A VOUT 1V/div. VOUT 1V/div. VSW 2V/div. VSW 2V/div. IINDUCTOR 5A/div. IINDUCTOR 5A/div. Short Circuit Entry Short Circuit Recovery IOUT= 4A IOUT= 4A VOUT 1V/div. VOUT 1V/div. VSW 2V/div. VSW 2V/div. IINDUCTOR 5A/div. IINDUCTOR 5A/div. VOUT/AC 50mV/div. IOUT 2A/div. EV2130DG-01A Rev.1.0 www.MonolithicPower.com 11/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 4 EV2131-G-00A – 4A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER 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 EV2130DG-01A Rev.1.0 www.MonolithicPower.com 11/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 5 EV2131-G-00A – 4A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER 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 between 2.7V and 5.5V, and then turn off the power supply. 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 board will automatically start up. 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 1.2V to turn on the regulator or less than 0.4V to turn it off. LAYOUT RECOMMENDATION OF MP2131 Proper layout of the switching power supplies is very important, and sometimes critical to make it work properly. Especially, for the high switching converter, if the layout is not carefully done, the regulator could show poor line or load regulation, stability issues. For MP2131, the high speed step-down regulator, the input capacitor should be placed as close as possible to the IC pins. As shown in Figure 6, the 0805 size ceramic capacitor is used, please make sure the two ends of the ceramic capacitor be directly connected to PIN1 (the Power Input Pin) and PIN 3 (the Power GND Pin). Figure 6— Two ends of Input decoupling Capacitor close to Pin 1 and Pin 3 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. EV2130DG-01A Rev.1.0 www.MonolithicPower.com 11/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 6