EV8845-C-02A 5A High Efficient Synchronous Step-Down Switcher with I²C Interface The Future of Analog IC Technology DESCRIPTION FEATURES The EV8845-C-02A is used for demonstrating the performance of MPS’s MP8845. MP8845 is a highly integrated and high frequency synchronous step-down switcher with I2C control interface. It is optimized to support up to 5A load current over an input supply range from 2.7V to 6V with excellent load and line regulation. Constant frequency hysteretic control mode provides extremely fast transient response and high efficiency. The output voltage level can be controlled, on-the fly through a 3.4Mbps I2C serial interface. Voltage range can be adjusted from 0.6V to 1.1V in 3.9mV steps. Voltage slew rate, switching frequency and power savings mode are also selectable through the I2C interface. Fully protection features includes internal soft start, over current protection and over temperature protection. MP8845 is available in WLCSP20-1.6mmx2mm package. ELECTRICAL SPECIFICATION Parameter Input Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 2.7– 6 0.9 5 V V A Wide 2.7V to 6V Operating Input Range Up to 5A Load Current Internal 28mΩ High-Side, 17mΩ Low-Side Power MOSFETs Fixed Frequency Hysteretic Mode Control I2C Compatible Interface up to 3.4Mbps I2C Programmable Output Range from 0.6V to 1.1V in 3.9mV Steps Factory Adjustable Switching Frequency from 1MHz to 2.2MHz I2C Programmable Voltage Transition Slew Rate Power Saving Mode Selectable via I2C Internal Soft-Start Power Good Indicator Current Overload and Thermal Shutdown Protection Available in 20-ball WLCSP-1.6mmx2mm package APPLICATIONS Processor Core Supply Micro Converter All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. EV8845-C-02A EVALUATION BOARD Efficiency (PFM vs. PWM) 100 VIN=3.6V, VOUT=1.1V 90 PFM 80 70 60 50 PWM 40 30 20 10 Board Number MPS IC Number EV8845-C-02A MP8845GC 0 0.01 0.1 1 OUTPUT CURRENT (A) EV8845-C-02A Rev.1.0 www.MonolithicPower.com 12/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 10 1 EV8845-C-02A – 5A HIGH EFFICIENT SYNC. STEP DOWN SWITCHER WITH I2C VOUT VIN EVALUATION BOARD SCHEMATIC EV8845-C-02A BILL OF MATERIALS Qty RefDes 2 1 C1, C2, C3 C4 C5 C6 C7 C8 C9 R1 R2 R3 R4 R5 R6 R7 R8 6 3 0 0 Q1 1 L1 1 U1 Value Description Package Manufacturer Manufacturer P/N 22μF Ceramic Cap., 10V, X5R 0.1μF Ceramic Cap,16V,X7R SM0805 SM0603 muRata muRata GRM21BR61A226ME51L GRM188R71C104KA01D 22μF Ceramic Cap,6.3V,X5R SM0805 muRata GRM21BR60J226ME39L 100k Film Res.,5% SM0603 Any NS NS SM 4.0X2.0mm WLCSP20MP8845 Step Down Switcher With I2C 1.6mmx2mm 0.47μH Inductor IR=6.8A,Isat=14.5A Wurth 744 373 240 047 MPS MP8845GC EV8845-C-02A Rev.1.0 www.MonolithicPower.com 12/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 2 EV8845-C-02A – 5A HIGH EFFICIENT SYNC. STEP DOWN SWITCHER WITH I2C EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN = 5V, VOUT = 0.9V, L = 0.47µH, TA = 25°C, unless otherwise noted. SUPPLY CURRENT (mA) 0.3 Supply Current vs. Input Voltage Efficiency (PFM vs. PWM) 100 VIN=3.6V, VOUT=1.1V 90 0.25 0.2 0.05 0 2 3 4 5 6 INPUT VOLTAGE (V) PFM 70 70 50 40 30 30 20 20 10 10 7 Load Regulation 0.1 1 OUTPUT CURRENT (A) PFM 60 PWM 40 0 0.01 VIN=5V, VOUT=1.1V 90 80 50 0.1 100 80 60 0.15 Efficiency (PFM vs. PWM) 10 0 0.01 PWM 0.1 1 OUTPUT CURRENT (A) 10 Case Temprature Rise 0.5 40 0.4 30 0.3 VIN=3.3V 0.2 20 VIN=4.2V 0.1 VIN=5V VIN=5V 10 0.0 -0.1 VIN=3.3V 0 1 2 3 4 5 OUTPUT CURRENT (A) 6 0 0 1 2 3 4 5 OUTPUT CURRENT (A) 6 EV8845-C-02A Rev.1.0 www.MonolithicPower.com 12/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 3 EV8845-C-02A – 5A HIGH EFFICIENT SYNC. STEP DOWN SWITCHER WITH I2C EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 5V, VOUT = 0.9V, L = 0.47µH, TA = 25°C, unless otherwise noted. EV8845-C-02A Rev.1.0 www.MonolithicPower.com 12/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 4 EV8845-C-02A – 5A HIGH EFFICIENT SYNC. STEP DOWN SWITCHER WITH I2C PRINTED CIRCUIT BOARD LAYER Figure 1: Top Silk Layer Figure 2: Top Layer Figure 3: Inner 1 Layer Figure 4: Inner 2 Layer Figure 5: Bottom Layer EV8845-C-02A Rev.1.0 www.MonolithicPower.com 12/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 5 EV8845-C-02A – 5A, 5A HIGH EFFICIENT, 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 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. LAYOUT RECOMMENDATION OF MP8845 Proper layout of the switching power supplies is very important, and sometimes critical to make it work properly. Especially, for the high switching frequency converter, if the layout is not carefully done, the regulator could show poor line or load regulation, stability issues. 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. EV8845-C-02A Rev.1.0 www.MonolithicPower.com 12/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2016 MPS. All Rights Reserved. 6