Maxim公司的MAX17320是38μA IQ單獨可用的電池側電量計量集成電路,具有保護器,電池內部自放電檢測和選擇SHA-256認證,用于2到4串接鋰電池/聚合物電池.器件檢測電壓,電流,溫度和電池狀態(tài), 采用外接高邊N-FET以提供對過壓/欠壓,過流,短路,超溫/低溫,過充和內部自放電條件的保護,并提供充電預描述以保證電池工作在安全條件,從而延長了電池壽命. MAX17320采用內部的FET來平衡電池.在預先通過鑒定的充電,器件采用CHGFET進行線性控制充電.電量計量采用該公司的ModelGaugeTM m5算法,組合了短期精度和庫侖計線性度,以及基于電壓的電量計量長期穩(wěn)定性,從而提供業(yè)界一流的電量計量精度. MAX17320能自動補償電池老化,溫度,放電速率,在各種工作狀態(tài)下能以毫安時(mAh)或百分比(%)提供精確的電荷狀態(tài)(SOC).器件提供可配置的常開的LDO,能給系統(tǒng)側的小型臨界負載供電,即使在故障情況下也不會對電池造成過載.動態(tài)功率功能提供瞬態(tài)最大電池輸出功率. MAX17320提供1-Wire®或2-wire I2C/SMBus接口,對數(shù)據(jù)和控制寄存器進行存取.器件采用無鉛2.4mm x 2.6mm 30凸0.4mm 間隔WLP封裝和4mm x 4mm 24引腳TQFN封裝.主要用在智能手機,平板電腦和2合1膝上型計算機,醫(yī)療設備,健康和健美監(jiān)視器,數(shù)碼相機,錄相機和動作攝像機,手持計算機,無線電和終端,電動工具,無線揚聲器和無人機,智能電池和備份電池.本文介紹了MAX17320主要優(yōu)勢和特性,框圖和典型應用電路圖,評估板MAX17320X/MAX17320G EVK主要特性,電路圖,材料清單和PCB設計圖.
The MAX17320 is a 38μA IQ stand-alone pack-side fuel gauge IC with protector, battery internal self-discharge detection, and optional SHA-256 authentication for 2 to 4 series lithium-ion/polymer batteries.
The IC monitors the voltage, current, temperature and state of the battery to provide protection against over/undervoltage, overcurrent, short-circuit, over/undertemperature, overcharge, and internal self-discharge conditions using external high-side N-FETs, and provides charging prescription to ensure that the battery operates under safe conditions, thereby prolonging the life of the battery. The IC balances the cells using internal FETs. During prequal charging, the IC uses the CHGFET to linearly control charging.
To prevent battery pack cloning, the IC integrates SHA-256 authentication with a 160-bit secret key. Each IC incorporates a unique 64-bit ID.
The fuel gauge uses Maxim ModelGaugeTM m5 algorithm that combines the short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based fuel gauge to provide industry-leading fuel gauge accuracy. The IC automatically compensates for cell aging, temperature, and discharge rate, and provides accurate state-of-charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions.
The IC provides a configurable always-on LDO that can power small critical loads on the system side without overloading the cells even under fault conditions. Dynamic power functionality provides the instantaneous maximum battery output power which can be delivered to the system without violating the minimum system input voltage.
A Maxim 1-Wire® or 2-wire I2C/SMBus interface provides access to data and control registers. The IC is available in a lead-free, 2.4mm x 2.6mm 30-bump 0.4mm pitch WLP and 4mm x 4mm 24-pin TQFN packages.
MAX17320主要優(yōu)勢和特性:
● Battery Health + Programmable Safety/Protection
• Overvoltage (Temperature Dependent)
• Overcharge/Overdischarge/Short-Circuit Current
• Over/Undertemperature
• Undervoltage + SmartEmpty
• Battery Internal Self-Discharge Detection
• Ideal Diode Discharge During Charge Fault
• Charging Prescriptions (JEITA)
• Prequal Charge Control with CHG FET
● ModelGauge m5 EZ Algorithm
• Percent, Capacity, Time-to-Empty/Full, Age
• Cycle+™ Age Forecast
● Precision Measurement Without Calibration
• Current, Voltage, Power, Time, Cycles
• Die Temperature, 4 Thermistors ±1˚C
● Cell Balancing with Internal FETs
● SHA-256 Authentication
● Nonvolatile Memory for Stand-Alone Operation
• History Logging, User Data (84 Bytes)
● Low Quiescent Current
• FETs Enabled: 38μA Active
● Pushbutton Wakeup—Eliminates System Consumption Until Button Press
● Always-On LDO
● Dynamic Power—Estimates Power Capability
● SBS 1.1 Compatible Register Set
MAX17320應用:
● Smartphones, Tablets, and 2-in-1 Laptops
● Medical Devices, Health and Fitness Monitors
● Digital Still, Video, and Action Cameras
● Handheld Computers, Radios, and Terminals
● Power Tools, Wireless Speakers, and Drones
● Smart Batteries and Battery Backup
圖1.MAX17320框圖
圖2.MAX17320典型應用電路圖
圖3.MAX17320 2S-4S電池組和系統(tǒng)實現(xiàn)圖
圖4.MAX17320帶保險絲的應用電路圖
評估板MAX17320X/MAX17320G EVK
The MAX17320X/MAX17320G evaluation kits (EV kits) are fully assembled and tested surface-mount PCBs that evaluate the stand-alone pack-side fuel gauge IC with protector and optional SHA-256 authentication for 2-4 cell lithium-ion/polymer batteries.
The MAX17320 EV kits include the IC evaluation board with integrated I2C/1-Wire® interface and USB micro-B cable. Windows® based graphical user interface (GUI) software is available for use with the EV kit and can be downloaded from https://www.maximintegrated.com/ products/MAX17320.html/ product page under “Design Resources” tab. Windows 7 or newer Windows operating system is required to use with the EV kit GUI software.
評估板MAX17320X/MAX17320G EVK主要特性:
ModelGauge m5 Algorithm
Monitors Multicell Packs
Full Protection Solution On-Board for Evaluation
Battery Pack Input Voltage Range of +2.3V to +4.9V/ Cell with Default Hardware
Default Current Range -10A to +10A with 5mΩ Sense Resistor, Higher Currents Can Be Supported by Changing to a Smaller Sense Resistor
Thermistor Measurement
On-Board I2C/1-Wire Communication Interface with Built-In MAXUSB Interface
Windows 7 or Newer Compatible Software
Proven PCB Layout
Fully Assembled and Tested
圖5.評估板MAX17320 EVK連接圖
圖6.評估板MAX17320X EVK外形圖
圖7.評估板MAX17320X EVK電路圖(1)
圖8.評估板MAX17320X EVK電路圖(2)
評估板MAX17320X EVK材料清單:
圖9.評估板MAX17320X EVK PCB設計圖:左:頂層絲印;右:頂層
圖10.評估板MAX17320X EVK PCB設計圖:左:層2;右:層3
圖11.評估板MAX17320X EVK PCB設計圖:左:底層;右:底層絲印
評估板MAX17320G EVK材料清單:
圖12.評估板MAX17320G EVK電路圖(1)
圖13.評估板MAX17320G EVK電路圖(2)
圖14.評估板MAX17320G EVK PCB設計圖(1):左:頂層絲印;右:頂層
圖15.評估板MAX17320G EVK PCB設計圖(2):左:層2;右:層3
圖16.評估板MAX17320G EVK PCB設計圖(3):左:底層;右:底層絲印 |
