MP8666DN-LF

MP8865 High-Efficiency, 6A, 21V, Synchronous Step-Down Converter with I2C Interface DESCRIPTION FEATURES The MP8865 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with an I2C control interface. It offers a very compact solution to achieve a 6A continuous output current with excellent load and line regulation over a wide input supply range. The MP8865 has synchronous-mode operation for higher efficiency over the output load range.      The reference voltage level can be controlled on-the-fly through the 3.4Mbps I2C serial interface. The voltage range can be adjusted from 0.6V to 1.87V in 10mV steps. Also, the voltage slew rate, switching frequency, enable, and power-saving mode are selectable through the I2C interface.        Current-mode operation provides fast transient response and eases loop stabilization. Full protection features include over-current protection (OCP), over-voltage protection (OVP), and thermal shutdown (TSD). Wide 4.5V to 21V Operation Input Range 45mΩ/18mΩ Low RDS(ON) Internal Power MOSFETs 1% VOUT Accuracy I2C Programmable Reference Voltage Range from 0.6V to 1.87V in 10mV Steps with Slew Rate Control I2C Selectable Switching Frequency. Default 600kHz Switching Frequency. Programmable Output Voltage Power-Saving Mode, OTP, and OCP via I2C Power Good Indication 1-Bit I2C Address Set OCP Protection in Hiccup Mode External Soft Start Available in a QFN-15 3mm x 3mm Package APPLICATIONS    The MP8865 requires a minimal number of readily available, standard, external components and is available in a QFN-15 3mm x 3mm package. SoC and Media Processors General Consumers Distributed Power Systems All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION C4 R8 10Ω 0.1μF 4.5V-21V L1 1μH BST VIN 1.2V/6A SW VOUT C2 22μFX2 R9 100kΩ R1 34kΩ VOUT C5 47μF FB R3 33kΩ EN/SYNC VCC C1 0.22μF MP8865 SDA SCL ADD SS R4 100kΩ PG AGND MP8865 Rev. 1.03 1/18/2018 PGND R2 34kΩ SDA SCL C7 22nF www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 1 MP8865 – SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number MP8865GQ* EVKT-8865 Package QFN-15 (3mmx3mm) Evaluation Kit Top Marking See Below *For Tape & Reel, add suffix –Z (e.g. MP8865GQ–Z); TOP MARKING AGL: Product code of MP8865GQ Y: Year code LLL: Lot number EVALUATION KIT EVKT-8865 EVKT-8865 Kit contents: (Items can be ordered separately). # Part Number Item Quantity 1 EV8865-Q-00A 2 EVKT-USBI2C-02 3 Tdrive-8865 MP8865GQ evaluation board Includes one USB to I2C dongle, one USB cable, and one ribbon cable USB flash drive that stores the GUI installation file and supplemental documents 1 1 1 Order direct from MonolithicPower.com or our distributors Input Power Supply Input GUI USB Cable Ribbon Cable USB to I2C Dongle EV8865-Q-00A Output Load Figure 1: EVKT-8865 Evaluation Kit Set-Up MP8865 Rev. 1.03 1/18/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 2 MP8865 – SYNCHRONOUS STEP-DOWN CONVERTER PACKAGE REFERENCE TOP VIEW AGND VCC 15 VIN PGND 14 SS FB VOUT 13 12 11 10 BST 9 SW 8 PGND 1 2 3 4 EN/SYNC PG 5 6 7 SDA SCL ADD QFN-15 (3mmx3mm) ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance (6) VIN …………………………….. ........ -0.3V to 22V VSW……………………………………………………………………………… -0.3V (-5V for 65% VIN In these cases, add an external BST diode from VCC to BST (see Fig. 12). Figure 12. Optional External Bootstrap Diode to Enhance Efficiency The recommended external BST diode is IN4148, and the BST capacitor value is 0.1µF to 1μF. Top Layer PCB Layout Guidelines(11) Efficient PCB layout is critical to achieve stable operation, especially for VCC capacitor and input capacitor placement. For best results, refer to Fig. 13 and follow the guidelines below: 1) 2) 3) 4) 5) Use a large ground plane connected directly to GND. If bottom layer is ground plane, add vias near GND. Place as close as possible the VCC capacitor to VCC and GND. Make the trace length of VCC to the VCC capacitor anode to the VCC capacitor cathode chip to GND as short as possible. Place the ceramic input capacitor close to IN and GND. Keep the connection of the input capacitor and IN as short and wide as possible. Route SW and BST away from sensitive analog areas (such as FB). It is NOT recommended to route SW and BST traces under the chip’s bottom layer. Place the T-type feedback resistor R3 close to the chip to ensure the trace (which connects to FB) is as short as possible. Bottom Layer Figure 13. Recommended PCB Layout Notes: 11) The recommended layout is based on Fig. 15 in the “Typical Application Circuits” section on page 26. MP8865 Rev. 1.03 1/18/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 24 MP8865 – SYNCHRONOUS STEP-DOWN CONVERTER Design Example Below is a design example following the application guidelines for the specifications: TABLE 4. Design Example VIN VOUT IO 12V 1.2V 6A The detailed application schematics are shown in Fig. 16. The typical performance and circuit waveforms have been shown in the “Typical Performance Characteristics” section. For more device applications, please refer to the related evaluation board datasheets. MP8865 Rev. 1.03 1/18/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 25 MP8865 – SYNCHRONOUS STEP-DOWN CONVERTER TYPICAL APPLICATION CIRCUITS R8 10Ω C4 0.1uF 10 VIN 4.5V-21V C8 22uF 1 C2 22uF R7 C3 100kΩ 0.1uF SW 3 14 R6 NS L1 1uH BST VIN C1 0.22μF VCC VOUT PG 4 PG 5 SDA SCL ADD 7 SS 15 C5 22uF C6 22uF VOUT C12 NS R9 100kΩ FB AGND R5 10Ω 11 MP8865 SDA SCL 6 C11 22pF EN/SYNC R4 100kΩ 0.9V/6A 9 12 13 PGND 2,8 C7 22nF Figure 14. 12V Input-0.9V/6A Output R8 10Ω C4 0.1uF 10 VIN 4.5V-21V C8 22uF 1 C2 22uF C3 0.1uF L1 1uH BST VIN R7 100kΩ SW 3 R6 NS 14 C1 0.22μF VOUT R4 100kΩ PG 4 SDA SCL 5 6 7 C11 22pF EN/SYNC VCC C5 22uF C6 22uF VOUT C12 NS R9 100kΩ C9 R3 15pF 33kΩ PG FB SDA SCL ADD SS 15 R5 10Ω 11 MP8865 AGND 1V/6A 9 12 C10 10pF 13 R1 34kΩ R2 51kΩ PGND 2,8 C7 22nF Figure 15. 12V Input-1V/6A Output R8 10Ω C4 0.1uF 10 VIN 4.5V-21V C8 22uF 1 C2 22uF C3 0.1uF L1 1uH BST VIN R7 100kΩ SW 3 R6 NS 14 C1 0.22μF PG 4 SDA SCL 5 6 7 C11 22pF EN/SYNC VCC VOUT R4 100kΩ FB SS 15 C5 22uF C6 22uF VOUT C12 NS R9 100kΩ C9 R3 10pF 33kΩ PG AGND R5 10Ω 11 MP8865 SDA SCL ADD 1.2V/6A 9 12 C10 10pF 13 R1 34kΩ R2 34kΩ PGND 2,8 C7 22nF Figure 16. 12V Input-1.2V/6A Output Notes: 12) Except for Fig. 13, the other circuits are based on a 0.6V default reference voltage. 13) R5 is used for loop test purposes. It is NOT needed if the test loop has a small signal. MP8865 Rev. 1.03 1/18/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 26 MP8865 – SYNCHRONOUS STEP-DOWN CONVERTER R8 10Ω C4 0.1uF 10 VIN 4.5V-21V C8 22uF 1 C2 22uF C3 0.1uF L1 1.5uH BST VIN R7 100kΩ SW 3 R6 NS 14 C1 0.22μF VOUT R4 100kΩ PG 4 SDA SCL 5 6 7 C11 22pF EN/SYNC VCC C5 22uF C6 22uF VOUT C12 NS R9 100kΩ C9 R3 10pF 15kΩ PG FB SDA SCL ADD SS 15 R5 10Ω 11 MP8865 AGND 1.8V/6A 9 12 C10 15pF 13 R1 34kΩ R2 16.5kΩ PGND 2,8 C7 22nF Figure 17. 12V Input-1.8V/6A Output R8 10Ω C4 0.1uF 10 VIN 4.5V-21V C8 22uF 1 C2 22uF C3 0.1uF L1 1.8uH BST VIN R7 100kΩ SW 3 R6 NS 14 C1 0.22μF VOUT R4 100kΩ PG 4 SDA SCL 5 6 7 C11 22pF EN/SYNC VCC C5 22uF C6 22uF VOUT C12 NS R9 100kΩ C9 R3 15pF 15kΩ PG FB SDA SCL ADD SS 15 R5 10Ω 11 MP8865 AGND 2.5V/6A 9 12 C10 22pF 13 R1 34kΩ R2 10.7kΩ PGND 2,8 C7 22nF Figure 18. 12V Input-2.5V/6A Output R8 10Ω C4 0.1uF 10 VIN 4.5V-21V C8 22uF 1 C2 22uF C3 0.1uF R7 100kΩ SDA SCL SW 3 R6 NS PG L1 2.7uH BST VIN 14 C1 0.22μF VOUT R4 100kΩ 4 5 6 7 C11 22pF EN/SYNC VCC FB SS 15 C5 22uF C6 22uF VOUT C12 NS R9 100kΩ C9 R3 15pF 15kΩ PG AGND R5 10Ω 11 MP8865 SDA SCL ADD 3.3V/6A 9 12 C10 33pF 13 R1 34kΩ R2 7.5kΩ PGND 2,8 C7 22nF Figure 19. 12V Input-3.3V/6A Output MP8865 Rev. 1.03 1/18/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 27 MP8865 – SYNCHRONOUS STEP-DOWN CONVERTER R8 10Ω C4 0.1uF 10 VIN 7V-21V 1 C8 22uF C2 22uF C3 0.1uF R7 100kΩ SDA SCL SW 3 R6 NS PG L1 2.7uH BST VIN 14 C1 0.22μF VOUT R4 100kΩ PG 5 SDA SCL ADD 7 SS 15 C5 22uF C6 22uF VOUT C12 NS R9 100kΩ FB AGND R5 10Ω 11 MP8865 4 6 C11 22pF EN/SYNC VCC 5V/6A 9 12 13 C9 R3 15pF 7.5kΩ R1 34kΩ C10 47pF R2 4.64kΩ PGND 2,8 C7 22nF Figure 20. 12V Input-5V/6A Output MP8865 Rev. 1.03 1/18/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 28 MP8865 – SYNCHRONOUS STEP-DOWN CONVERTER PACKAGE INFORMATION QFN-15 (3mmX3mm) PIN 1 ID 0.10x45° TYP. PIN 1 ID MARKING PIN 1 ID INDEX AREA BOTTOM VIEW TOP VIEW SIDE VIEW NOTE: 0.10x45° 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETERS MAX. 4) JEDEC REFERENCE IS MO-220. 5) DRAWING IS NOT TO SCALE. RECOMMENDED LAND PATTERN 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. MP8865 Rev. 1.03 1/18/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 29