RK860-3

RK860 Datasheet Rev 1.6 Rockchip RK860 Datasheet Revision History Date Revision Description 2022-11-17 1.6 Update the Typical Application and layout information 2022-11-01 1.5 Update the ordering and layout information 2022-04-27 1.4 1，Modify layout recommendation description 2，Modify the dimension information 2022-02-22 1.3 1，Modify Package Thermal Characteristics description 2，Modify more description of the output current capability 2021-10-11 2021-06-23 2021-05-11 1.2 1.1 1.0 Update RK860-3 description Update Thermal Management information Initial release Copyright 2022 © Rockchip Electronics Co., Ltd. 1 RK860 Datasheet Rev 1.6 Table of Content Table of Content .................................................................................................. 2 Warranty Disclaimer ............................................................................................. 5 Chapter 1 Introduction ............................................................................... 6 1.1 1.2 1.3 1.4 1.5 Chapter 2 Overview ...................................................................................... 6 Feature ........................................................................................ 6 Typical Application Diagrams ........................................................... 6 Pin Assignment .............................................................................. 7 Pinout Number Order ..................................................................... 7 Electrical Characteristics .............................................................. 9 2.1 2.2 2.3 Chapter 3 Absolute Maximum Ratings (Note 1) ................................................. 9 Recommended Operating Conditions (Note 2) .................................... 9 Electrical Characteristics ................................................................. 9 Chip Version Description ............................................................ 11 Chapter 4 Register Description .................................................................. 11 Chapter 5 Typical Performance Characteristics ............................................ 14 Chapter 6 Package information ................................................................. 16 6.1 6.2 6.3 6.4 Chapter 7 Ordering information ..................................................................... 16 Top Marking ................................................................................. 16 Dimension ................................................................................... 16 Layout recommendation ................................................................ 17 Thermal Management ............................................................... 18 7.1 7.2 Overview ..................................................................................... 18 Package Thermal Characteristics ..................................................... 18 Copyright 2022 © Rockchip Electronics Co., Ltd. 2 RK860 Datasheet Rev 1.6 Figure Index Fig. Fig. Fig. Fig. Fig. Fig. 1-1 1-2 1-2 6-1 6-2 6-3 RK860 General Application ..................................................................... 6 RK860 Application In Particular Cases ...................................................... 7 Pin Assignment（Top view） ................................................................... 7 WLCSP20（Pitch is 0.4mm） ................................................................. 16 General PCB Layout Suggestion ............................................................ 17 PCB Layout Suggestion In Particular Cases ............................................. 17 Copyright 2022 © Rockchip Electronics Co., Ltd. 3 RK860 Datasheet Rev 1.6 Table Index Table Table Table Table 7-1 7-2 7-3 7-4 Thermal Resistance Characteristics ............................................................... 18 SnPb Eutectic Process-Classification Temperatures (TC) ................................... 18 Pb-Free Process-Classification Temperatures (TC) ........................................... 18 Classification Reflow Profiles ........................................................................ 19 Copyright 2022 © Rockchip Electronics Co., Ltd. 4 RK860 Datasheet Rev 1.6 Warranty Disclaimer Rockchip Electronics Co.,Ltd makes no warranty, representation or guarantee (expressed, implied, statutory, or otherwise) by or with respect to anything in this document, and shall not be liable for any implied warranties of non-infringement, merchantability or fitness for a particular purpose or for any indirect, special or consequential damages. Information furnished is believed to be accurate and reliable. However, Rockchip Electronics Co., Ltd assumes no responsibility for the consequences of use of such information or for any infringement of patents or other rights of third parties that may result from its use. Rockchip Electronics Co.,Ltd’s products are not designed, intended, or authorized for using as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Rockchip Electronics Co.,Ltd’s product could create a situation where personal injury or death may occur, should buyer purchase or use Rockchip Electronics Co.,Ltd’s products for any such unintended or unauthorized application, buyers shall indemnify and hold Rockchip Electronics Co.,Ltd and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, expenses, and reasonable attorney fees arising out of, either directly or indirectly, any claim of personal injury or death that may be associated with such unintended or unauthorized use, even if such claim alleges that Rockchip Electronics Co.,Ltd was negligent regarding the design or manufacture of the part. Copyright and Patent Right Information in this document is provided solely to enable system and software implementers to use Rockchip Electronics Co., Ltd ’s products. There are no expressed or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. Rockchip Electronics Co.,Ltd does not convey any license under its patent rights nor the rights of others. All copyright and patent rights referenced in this document belong to their respective owners and shall be subject to corresponding copyright and patent licensing requirements. Trademarks Rockchip and RockchipTM logo and the name of Rockchip Electronics Co.,Ltd’s products are trademarks of Rockchip Electronics Co.,Ltd. and are exclusively owned by Rockchip Electronics Co.,Ltd. References to other companies and their products use trademarks owned by the respective companies and are for reference purpose only. Confidentiality The information contained herein (including any attachments) is confidential. The recipient hereby acknowledges the confidentiality of this document, and except for the specific purpose, this document shall not be disclosed to any third party. Reverse engineering or disassembly is prohibited. ROCKCHIP ELECTRONICS CO.,LTD. RESERVES THE RIGHT TO MAKE CHANGES IN ITS PRODUCTS OR PRODUCT SPECIFICATIONS WITH THE INTENT TO IMPROVE FUNCTION OR DESIGN AT ANY TIME AND WITHOUT NOTICE AND IS NOT REQUIRED TO UNDATE THIS DOCUMENTATION TO REFLECT SUCH CHANGES. Copyright © 2022 Rockchip Electronics Co., Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electric or mechanical, by photocopying, recording, or otherwise, without the prior written consent of Rockchip Electronics Co.,Ltd. Copyright 2022 © Rockchip Electronics Co., Ltd. 5 RK860 Datasheet Rev 1.6 Chapter 1 Introduction 1.1 Overview The RK860 is a high efficiency 2.4MHz synchronous step down DC/DC regulator IC capable of delivering up to 7A output current. It can operate over a wide input voltage range from 2.7V to 5.5V. And, it integrates a main switch and a synchronous switch with both very low RDS (ON) to minimize the conduction loss. The output voltage can be programmed from 0.7125V to 1.5V with 12.5mV/step or 0. 5V to 1.5V with 6.25mV/step through I2C interface. The RK860 is in a space saving, low profile WLCSP 1.65mm*2.05mm-20 package. 1.2 Feature  Input voltage range：2.7V-5.5V         2.4MHz switching frequency minimizes the external components Typical 70uA quiescent current when VIN=3.8V and Temp=25℃ Low RDs(ON) for internal switches(PFET/NFET):24mohm/16ohm @ VIN=3.8V Programmable output voltage:0.7125V to 1.5V with 12.5mV/step or 0.5V to 1.5V with 6.25mV/step 7A continuous output current capability Capable for 0.24uH inductor and 22uF*2 ceramic capacitor Hic-cup mode protection for hard short condition Integrate inner protection：Cycle by cycle OCP and VIN-OVP/UVLO/DIE-TSD   RoHS compliant and Halogen free Compact package: WLCSP 1.65*2.05-20 1.3 Typical Application Diagrams LOUT VIN 2.7V-5.5V 0.24uH VIN LX VOUT （0.7125V-1.5V） (0.5V-1.5V) CIN 10uF*2 VOUT EN SDA SCL VSEL RK860 COUT 22uF*2 GND AGND Fig. 1-1 RK860 General Application Copyright 2022 © Rockchip Electronics Co., Ltd. 6 RK860 Datasheet Rev 1.6 2.7V-5.5V VOUT LOUT VIN （0.7125V-1.5V） (0.5V-1.5V) 0.24uH VIN LX CIN COUT C1 10uF*2 22uF*2 1uF RK860 PCB Routing AP CAP VOUT EN SDA SCL VSEL GND AGND Fig. 1-2 RK860 Application In Particular Cases 1.4 Pin Assignment 1 2 3 4 A VSEL EN SCL VOUT B SDA GND GND AGND AGND C GND GND GND GND D VIN VIN LX LX LX E VIN VIN LX LX LX Fig. 1-3 Pin Assignment（Top view） 1.5 Pinout Number Order Number Name D1,D2,E1,E2 VIN Function Power input pins. These pins must be decoupled to ground by 2 10uF ceramic capacitor as input filter at least.The input Copyright 2022 © Rockchip Electronics Co., Ltd. I/O Power 7 RK860 Datasheet Rev 1.6 Number Name D3,D4,E3,E4 LX B2,B3,C1,C2,C3,C4 B4 GND AGND A1 VSEL A2 EN A3 SCL B1 SDA A4 VOUT Function capacitor should be placed as close as possible between VIN and GND pins. Switching node pin. Connect these pins to switching node of inductor. Power ground pins. Analog ground pin. Voltage select pin. When this pin is low, VOUT is set by the VSEL0 register. When this pin is high, VOUT is set by the VSEL1 register. Enable control pin. Active high. Do not leave it floating. I2C interface clock line. I2C interface Bi-directional Data line. (Open darin) Sense pin for output. Connect to the output capacitor side Copyright 2022 © Rockchip Electronics Co., Ltd. I/O Output Ground Input Input Input I/O Output 8 RK860 Datasheet Rev 1.6 Chapter 2 Electrical Characteristics Note 1.Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2: The device is not guaranteed to function outside its operating conditions. 2.1 Absolute Maximum Ratings (Note 1) Parameter Voltage range on pins VIN： Voltage range on other pins Continuous power dissipation, PD @ TA=25'C,WCSP4*5-20 Junction temperature range, TJ Value 6.0 VIN+0.6 Units V V 0.5 W -40~150 ℃ 260 ℃ -65~150 ℃ 2000 1000 V V Lead Temperature(soldering 10 sec),TSOLDER Storage temperature range, TS ESD Susceptibility ESD HBM ESD CDM 2.2 Recommended Operating Conditions Parameter (Note 2) Symbol value Units Supply Input Voltage Output Voltage Inductor Input Capacitor Output Capacitor Junction temperature range VIN VOUT L CIN COUT Tj 2.7~5.5 0.5~1.5 0.22~0.47 >10 44~88 -40~125 V V uH uF uF Ambient temperature range Ta -40~85 ℃ ℃ 2.3 Electrical Characteristics (With typical application circuit shown in below part, VIN=3.8V, VOUT=1.0V, L=0.24uH, COUT=22uF*2, TA=25℃ unless otherwise specified.) PARAMETERS SYMBOL Note MIN TYP MAX UNIT The UVLO threshold voltage of VIN The UVLO Hysteresis voltage of VIN The OVP threshold voltage of VIN The OVP Hysteresis voltage of VIN VIN_UVLO Vin rising 2.55 VIN_UVLO_HYS Vin falling 150 mV VIN_OV Vin rising 6 V VIN_OV_HYS Vin falling 200 mV 70 uA 0.1 25 uA uA 260 uS Quiescent Current Iq Shutdown current Software shutdown current Isd Isd_soft Internal soft-start time Tss No switching, vfb=105%Vref. EN=L EN=H, BUCK_EN=L Vout=1.0V， from BUCK_EN rising edge to Vout>92%. Copyright 2022 © Rockchip Electronics Co., Ltd. 2.65 V 9 RK860 Datasheet PARAMETERS Rev 1.6 SYMBOL Note MIN Oscillator Frequency Fclk PWM mode or FPWM mode 2.2 Discharge resistance Rdisc VIH VIL VIH VIL Input logic high threshold of signal (EN/VSEL) Input logic high threshold of signal (SDA/SCL) TYP MAX UNIT 2.4 2.6 MHz Ω 150 EN=L/BUCK_EN=0 1.1 0.54 V V V V -0.6 +0.6 % -1.5 1.5 % 0.4 1.26 VREG1(The Vout Accuracy when FPWM output Voltage error) Forced PWM, VOUT=1.0V VREG2(The Vout Accuracy when PFM PMOS RDS(ON) output Voltage error) RDS(ON)P NMOS RDS(ON) RDS(ON)N Maximum current of PMOS Maximum current of NMOS Thermal shutdown temperature Thermal shutdown Hysteresis Ipeak Ivalley TSD TSD_HYS Copyright 2022 © Rockchip Electronics Co., Ltd. Auto PFM, VOUT=1.0V VIN PIN to LX PIN,VIN=3.8V LX PIN to GND PIN,VIN=3.8V 24 16 8.5 7.0 Rising TSD threshold 150 25 mΩ mΩ A A ℃ ℃ 10 RK860 Datasheet Rev 1.6 Chapter 3 Chip Version Description DIE-ID I2C-ADDR Vout Default STEP/ DIE_ID (7-bit) Range/V Vout/V mV RK860-0 40H 0.7125-1.5 1.0 12.5 0X8 RK860-1 41H 0.7125-1.5 1.0 12.5 0X8 RK860-2 42H 0.5-1.5 0.8 6.25 0XA RK860-3 43H 0.5-1.5 0.8 6.25 0XA Chapter 4 Register Description VSEL0_A Address: (0x00) Bit Attr Reset Value Description 7 RW 0x1 BUCK_EN0: Software buck enable. 1:enable BUCK work; 0:shut off BUCK (When external EN pin is low. The regulator is off. When external EN pin is high, BUCK_EN bit takes precedent.) 6 RW 0x0 MODE0: 0=Allow auto-PFM mode during light load 1=Forced PWM mode 0x17 NSEL0 : 12.5mV/step (just for DIE_ID=0X8) 000000=0.7125V; 000001=0.7250V; 000010=0.7375V; ...... 010111=1.0000V; ...... 111111=1.5V; 5:0 RW VSEL1_A Address: (0x01) Bit 7 6 Attr RW RW Reset Value Description 0x1 BUCK_EN1: Software buck enable. 1:enable BUCK-LOOP work; 0:shut off BUCK-LOOP (When external EN pin is low. The regulator is off. When external EN pin is high, BUCK_EN bit takes precedent.) 0x0 MODE1: 0=Allow auto-PFM mode during light load 1=Forced PWM mode Copyright 2022 © Rockchip Electronics Co., Ltd. 11 RK860 Datasheet Bit Attr 5:0 RW Rev 1.6 Reset Value 0x17 Description NSEL1 : 12.5mV/step (just for DIE_ID=0X8) 000000=0.7125V; 000001=0.7250V; 000010=0.7375V; ...... 010111=1.0000V; ...... 111111=1.5V; Control_Register Address: (0x02) Bit 7 Attr RW Reset Value Description 0x1 Output Discharge: 0=discharge resistor is disabled. 1=discharge resistor is enabled. 6:4 RW 0x0 Slew Rate: Set the slew rate for positive voltage transitions. 000 = 10mV/0.15us 001 = 10mV/0.3us 010 = 10mV/0.6us 011 = 10mV/1.2us 100 = 10mV/2.4us 101 = 10mV/4.8us 110 = 10mV/9.6us 111 = 10mV/19.2us 3:0 RW 0x0 Always reads back 0. RESET：Setting to 1 resets all registers to default values. ID1 Register Address: (0x03) Bit Attr 7:5 R 0x4 VENDOR: IC vendor Rockchip code. 4 R 0x0 Reserved: Always reads back 0. 0x8/0xA DIE_ID: 0x8: Output Voltage from 0.7125V to 1.5V with 12.5mV/step 0xA: Output Voltage from 0.5V to 1.5V with 6.25mV/step 3:0 R Reset Value Description ID2 Register Address: (0x04) Copyright 2022 © Rockchip Electronics Co., Ltd. 12 RK860 Datasheet Rev 1.6 Bit Attr Reset Value Description 7:4 R 0x0 Reserved: Always reads back 0. 3:0 R NA NA PGOOD Register Address: (0x05) Bit 7 6 Attr R R Reset Value Description 0x0 PGOOD: 1:Buck is enabled and soft-start is completed. （Vout>92% normal set-value） 0：Vout is abnormal 0x0 TSD: thermal shut down BUCK. 1: Tdie>150'C，0: Tdie