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6V, 3A, Synchronous, Step-Down Switcher With I2C Interface EV8843-G-00A Rev.1.0 www.MonolithicPower.com 1 4/27/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. The Future of Analog IC Technology
DESCRIPTION
The EV8843-G-00A is used for demonstrating the performance of MP8843, a highly integrated, high frequency, synchronous, step-down switcher with I 2C 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 I 2C 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 Symbol Value Units Input Voltage V IN 2.5—6 V Output Voltage V OUT 0.6—1.1 V Output Current I OUT 3 A
FEATURES
Wide 2.5V to 6V Operating Input Range Up to 3A Output Current 55m Ω and 35mΩ Internal Power MOSFET High Speed I 2C Communication Interface up to 3.4MHz I 2C 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 I 2C-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 0.001 0.01 0.1 1 10 Board Number MPS IC Number EV8843-G-00A MP8843GG
EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C EV8843-G-00A Rev.1.0 www.MonolithicPower.com 2 4/27/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. EVALUATION BOARD SCHEMATIC Notes: 3) V IN<3.3V, may need more input capacitors. 4) V OUT default value is 0.9031V. EV8843-G-00A BILL OF MATERIALS Qty RefDes Value Description Package Manufacturer Manufacturer P/N
4 R1, R2,
R9, R10 100k Film Res, 1% SM0603 ROYAL RL0603FR-07100KL R3, R4, R5, R6, R7, R8 NS
0 Q1 NS
0 C1A NS
1 C1 22µF Ceramic Cap., 10V, X5R SM0805 Murata GRM21BR61A226ME51L
3 C2, C3,
C4 10µF Ceramic Cap., 10V, X5R SM0805 Murata GRM21BR61A106KE19L
1 L1 1 μH Inductor, DCR=22mΩ,
4.0x4.0mm, Isat=9A SMD Wurth 74437324010
1 U1 MP8843GG Synchronous Step-down
(2mmx2mm) MPS MP8843GG
EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C EV8843-G-00A Rev.1.0 www.MonolithicPower.com 3 4/27/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN=5V, VOUT=0.9V, L=1µH, TA=25oC, unless otherwise noted. CURRENT LIMT (A) VIN (V)VIN (V) IOUT (A) Load Regulation PWM Load Regulation PFM Current Limit vs. Input Voltage Ipeak Room Temp Thermal Rise vs. LoadLine Regulation PWM IOUT (A) OUTPUT CURRENT (A) IOUT (A) Efficiency vs. Load 100 VIN=6V PWM VIN=5V PWM VIN=2.5V PWM VIN=2.5V PFM VIN=6V PFM VIN=5V PFM -0.2 -0.15 -0.1 -0.05 0.05 0.1 0.15 0.2 VIN=6V PWM VIN=5V PWM VIN=2.5V PWM -0.2 -0.15 -0.1 -0.05 0.05 0.1 0.15 0.2 0.001 0.01 0.1 1 10 VIN=5V PFM VIN=6V PFM VIN=2.5V PFM -0.4 -0.2 0.2 0.4 234567 IOUT=0A PWM IOUT=3A PWM IOUT=2A PWM 0 0.5 1 1.5 2 2.5 3 3.5 4 VIN=3.3V VIN=5V
EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C EV8843-G-00A Rev.1.0 www.MonolithicPower.com 4 4/27/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. EVB TEST RESULTS (Continued) Performance waveforms are tested on the evaluation board. VIN=5V, VOUT=0.9V, L=1µH, TA=25oC, unless otherwise noted. VIN 5V/div. VSW 5V/div. VOUT AC Coupled 20mV/div. IL 500mA/div. VIN 5V/div. VSW 5V/div. VOUT AC Coupled 20mV/div. IL 2A/div. VIN 5V/div. VSW 5V/div. VOUT AC Coupled 20mV/div. IL 500mA/div. Steady State PWM IOUT=0A Steady State PWM IOUT=3A Steady State PFM IOUT=0A VOUT 500mV/div. VPG 5V/div. VSW 2V/div. IL 500mA/div. VOUT 500mV/div. VPG 2V/div. VSW 2V/div. IL 2A/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. IL 500mA/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. IL 2A/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. IL 500mA/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. IL 2A/div. Vin Startup PWM IOUT=0A Vin Startup PWM IOUT=3A Vin Shutdown PWM IOUT=0A Vin Shutdown PWM IOUT=3A EN Startup PWM IOUT=0A EN Startup PWM IOUT=3A
EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C EV8843-G-00A Rev.1.0 www.MonolithicPower.com 5 4/27/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 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 PWM IOUT=0A EN Shutdown PWM IOUT=3A VOUT 500mV/div. VPG 5V/div. VSW 2V/div. IL 5A/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. IL 500mA/div. VOUT 500mV/div. VPG 5V/div. VSW 5V/div. IL 2A/div. VOUT AC Coupled 50mV/div. VSW 5V/div. IL 2A/div. VOUT AC Coupled 50mV/div. VSW 5V/div. IL 2A/div. SCP PFM Load Transient PFM IOUT=0A to 3A Load Transient PWM IOUT=0A to 3A
EV8843-G-00A – 3A, 6V, SYNC STEP-DOWN SWITCHER WITH I2C NOTICE: The information in this document is subject to change wi thout notice. Please contact M PS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights ar e 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 7 4/27/2016 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 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.