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MAX8895X PDF预览

MAX8895X

更新时间: 2024-11-06 02:52:03
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
45页 4176K
描述
Li-Ion Chargers with Smart Power Selector, Adapter Type Detection, and USB Enumeration

MAX8895X 数据手册

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EVALUATION KIT AVAILABLE  
MAX8895V/MAX8895W/  
MAX8895X/MAX8895Y  
Li-Ion Chargers with Smart Power Selector,  
Adapter Type Detection, and USB Enumeration  
General Description  
Features  
The MAX8895_ USB-compliant linear battery chargers  
operate from either a USB port or dedicated charger with  
automatic detection of adapter type and USB enumera-  
tion capability. The MAX8895_ integrate the battery dis-  
connect switch, current-sense circuit, MOSFET pass ele-  
ments, and thermal regulation circuitry, and eliminate the  
external reverse-blocking Schottky diode to create the  
simplest and smallest stand-alone charging solutions.  
S Enables Charging from a USB Port*  
S Automatic Detection of Adapter Type  
S Enumeration Capability Without Processor  
Intervention  
S USB Low-Speed Operation Without External  
Crystal (MAX8895V/MAX8895W/MAX8895X)  
S USB Full-Speed Operation Using an External  
Crystal (MAX8895Y)  
The MAX8895_ includes an automated detection of  
charge adapter type, making it possible to distinguish  
between USB 2.0 device, USB charger, and dedicated  
charger devices. Furthermore, the MAX8895_ include a  
USB enumeration function that automatically negotiates  
with a USB host, making it possible to achieve the highest  
current available from a USB 2.0 device or USB charger  
without processor intervention. The adapter type detec-  
tion is compliant with USB 2.0 specification as well as USB  
charging Revision 1.1.  
S Compliant with USB 2.0 Specification  
S Compliant with USB Charging Specification  
(Revision 1.1)  
S Adaptive Input Current Limit for Dedicated  
Charger  
S Input Overvoltage Protection to 16V  
S Automatic Current Sharing Between Battery  
Charging and System  
The MAX8895_ controls the charging sequence for single-  
cell Li+ batteries from initial power-OK indication, through  
prequalification, fast-charge, top-off, and finally charge  
termination. Charging is controlled using constant cur-  
rent, constant voltage, and constant die-temperature  
(CCCVCTj) regulation for safe operation under all condi-  
tions. The maximum charging current is adaptively con-  
trolled by subtracting the system current from the input  
current limit, ensuring that the charging current is always  
maximized for any given operating condition.  
S Smart Power SelectorK Allows Operation with  
Discharged or No Battery  
S NTC Monitoring of Battery Temperature  
S No External MOSFETs Required  
S Thermal Regulation Prevents Overheating  
S 2µA Shutdown Current  
S Tiny 2.36mm x 2.36mm, 25-Bump, 0.4mm Pitch  
WLP Package  
The MAX8895_ features optimized smart power control  
to make the best use of limited USB or adapter power.  
Battery charge current is set independently of the  
SYS_ input current limit. Power not used by the system  
charges the battery. Automatic input selection switches  
the system from battery to external power. This allows  
the application to operate without a battery, discharged  
battery, or dead battery.  
Applications  
®
Bluetooth Headsets  
Charging Cradles  
Portable Devices  
Other features include undervoltage lockout (UVLO),  
overvoltage protection (OVP), charge status flag, charge  
fault flag, power-OK monitor, battery thermistor monitor,  
charge timer, and a 3.3V output.  
Ordering Information and Typical Operating Circuit appear  
at end of data sheet.  
The MAX8895_ operates from a +4.0V to +6.6V sup-  
ply and include overvoltage protection up to +16V. The  
MAX8895_ is specified over the extended temperature  
range (-40NC to +85NC) and are available in a compact  
2.36mm x 2.36mm, 25-bump WLP package (0.4mm pitch).  
Bluetooth is a registered trademark of Bluetooth SIG.  
Smart Power Selector is a trademark of Maxim Integrated  
Products, Inc.  
*Protected by US Patent #6,507,172.  
For pricing, delivery, and ordering information, please contact Maxim Direct  
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.  
19-5205; Rev 4 9/12  

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