EV8843-G-00A 6V, 3A, Synchronous, Step-Down Switcher With I2C Interface The Future of Analog IC Technology DESCRIPTION FEATURES The EV8843-G-00A is used for demonstrating the performance of MP8843, a highly integrated, high frequency, synchronous, step-down switcher with I2C control interface. MP8843 supports up to 3A current from a wide input supply range of 2.5V to 6V with excellent load and line regulation. Constant-on-time (COT) control provides fast transient response, high light-load efficiency and easy loop stabilization. The I2C interface allows for communication interface speed up to 3.4Mbps. It controls the output voltage on the fly from 0.6V to 1.1V with 3.9mV voltage steps and it also controls the output voltage transition slew rate. The interface also allows for the selection of power-save mode to meet different application requirements. Protection features include internal soft-start, over-current protection, and over-temperature protection. MP8843 is available in 2mmx2mm 12-pin QFN package. ELECTRICAL SPECIFICATION Parameter Input Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 2.5—6 0.6—1.1 3 V V A Wide 2.5V to 6V Operating Input Range Up to 3A Output Current 55mΩ and 35mΩ Internal Power MOSFET High Speed I2C Communication Interface up to 3.4MHz I2C Selectable Power Saving Mode Programmable Output Voltage from 0.6V to 1.1V with 3.9mV Steps Programmable Switching Frequency 1MHz to 2.5MHz Programmable Voltage Transition Slew Rate External and I2C-Controlled Power Good Indicator Short Circuit Protection with Latch-off Thermal Shutdown Internal Soft-Start Time Available in QFN-12 (2mmx2mm) Package APPLICATIONS Small/Handheld Devices Storage Drives Portable Instruments Battery-Powered Devices 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. Notes: 1) VIN<3.3V, may need more input capacitors. 2) VOUT default value is 0.9031V. EV8843-G-00A EVALUATION BOARD 100 90 80 70 60 50 40 30 20 10 Board Number MPS IC Number EV8843-G-00A MP8843GG 0 0.001 0.01 0.1 1 EV8843-G-00A Rev.1.0 www.MonolithicPower.com 4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 10 1 EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C EVALUATION BOARD SCHEMATIC Notes: 3) VIN<3.3V, may need more input capacitors. 4) 3) VOUT default value is 0.9031V. EV8843-G-00A BILL OF MATERIALS Qty 4 0 0 0 1 3 RefDes R1, R2, R9, R10 R3, R4, R5, R6, R7, R8 Q1 C1A C1 C2, C3, C4 1 L1 1 U1 Value Description Package Manufacturer Manufacturer P/N 100k Film Res, 1% SM0603 NS NS 22µF Ceramic Cap., 10V, X5R SM0805 Murata GRM21BR61A226ME51L 10µF Ceramic Cap., 10V, X5R SM0805 Murata GRM21BR61A106KE19L Wurth 74437324010 MPS MP8843GG ROYAL RL0603FR-07100KL NS Inductor, DCR=22mΩ, SMD 4.0x4.0mm, Isat=9A QFN12 Synchronous Step-down MP8843GG Converter (2mmx2mm) 1μH EV8843-G-00A Rev.1.0 www.MonolithicPower.com 4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 2 EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN=5V, VOUT=0.9V, L=1µH, TA=25oC, unless otherwise noted. Efficiency vs. Load Load Regulation 100 0.2 VIN=2.5V PFM 90 Load Regulation PWM PFM 0.2 0.15 80 0.15 0.1 70 VIN=5V PFM 60 50 VIN=6V PFM 40 VIN=2.5V PWM 30 0.05 0 0.001 0.01 0.1 IOUT (A) 0 -0.05 -0.15 -0.2 0.001 10 Line Regulation 0.01 0.1 IOUT (A) 1 10 -0.2 0.001 Current Limit vs. Input Voltage PWM 0.4 6 VIN=6V PFM -0.1 VIN=5V PWM -0.15 1 -0.05 VIN=6V PWM -0.1 VIN=6V PWM 10 VIN=5V PFM 0.05 0 VIN=5V PWM 20 0.1 VIN=2.5V PWM Ipeak Room Temp VIN=2.5V PFM 0.01 0.1 IOUT (A) 1 10 Thermal Rise vs. Load 20 18 5 CURRENT LIMT (A) 0.2 IOUT=0A PWM 0 IOUT=2A PWM -0.2 2 3 4 5 VIN (V) 4 6 7 VIN=3.3V 12 10 3 8 2 6 4 1 IOUT=3A PWM -0.4 16 14 0 2 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 VIN (V) 0 VIN=5V 0 0.5 1 1.5 2 2.5 3 3.5 4 OUTPUT CURRENT (A) EV8843-G-00A Rev.1.0 www.MonolithicPower.com 4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 3 EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C EVB TEST RESULTS (Continued) Performance waveforms are tested on the evaluation board. VIN=5V, VOUT=0.9V, L=1µH, TA=25oC, unless otherwise noted. Steady State Steady State Steady State PWM IOUT=0A PWM IOUT=3A PFM IOUT=0A VOUT AC Coupled 20mV/div. VIN 5V/div. VSW 5V/div. IL 500mA/div. VOUT AC Coupled 20mV/div. VOUT AC Coupled 20mV/div. VIN 5V/div. VSW 5V/div. VIN 5V/div. VSW 5V/div. Vin Startup Vin Startup Vin Shutdown PWM IOUT=0A PWM IOUT=3A PWM IOUT=0A VOUT 500mV/div. VPG 5V/div. VOUT 500mV/div. VPG 2V/div. VSW 2V/div. VSW 2V/div. IL 500mA/div. IL 2A/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. IL 2A/div. IL 500mA/div. IL 2A/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. IL 500mA/div. Vin Shutdown EN Startup EN Startup PWM IOUT=3A PWM IOUT=0A PWM IOUT=3A VOUT 500mV/div. VPG 5V/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. VSW 5V/div. IL 500mA/div. IL 2A/div. EV8843-G-00A Rev.1.0 www.MonolithicPower.com 4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 4 EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C EVB TEST RESULTS (Continued) Performance waveforms are tested on the evaluation board. VIN=5V, VOUT=0.9V, L=1µH, TA=25oC, unless otherwise noted. EN Shutdown EN Shutdown PWM IOUT=0A PWM IOUT=3A SCP PFM VOUT 500mV/div. VPG 5V/div. VOUT 500mV/div. VPG 5V/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. VSW 5V/div. VSW 2V/div. IL 500mA/div. IL 2A/div. IL 5A/div. VOUT AC Coupled 50mV/div. VSW 5V/div. IL 2A/div. Load Transient Load Transient PFM IOUT=0A to 3A PWM IOUT=0A to 3A VOUT AC Coupled 50mV/div. VSW 5V/div. IL 2A/div. EV8843-G-00A Rev.1.0 www.MonolithicPower.com 4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 5 EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 3 — Inner Layer1 Figure 2—Top Layer Figure 4 — Inner Layer2 Figure 5 — Bottom Layer EV8843-G-00A Rev.1.0 www.MonolithicPower.com 4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 6 EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C 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 2.5V and 6V, 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 MP8843 Proper layout of the switching power supplies is very important, and sometimes critical for proper function. Poor layout design can result in poor line or load regulation and stability issues. Please follow these guidelines and take page 6 as reference: 1. The high current paths (GND, VIN and SW) should be placed very close to the device with short, direct and wide traces. 2. The input capacitor needs to be as close as possible to the VIN and GND pins. 3. The Mode/Frequency circuit should be placed closed to the part. 4. The external feedback resistors should be placed next to the FB pin. 5. Keep the switching node SW short and away from the feedback network. In order to have better performances, it is better to use four layer boards. The inner 1 and 2 layers are Ground. 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. EV8843-J-00A Rev.1.0 www.MonolithicPower.com 4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 7