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参数资料
| 型号： | MAX8845ZETC+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR LI+ 28V 12TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 0 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFQFN 裸露焊盘 |
| 供应商设备封装： | 12-TQFN 裸露焊盘（3x3） |
| 包装： | 管件 |
28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
Capacitor Selection
Connect a ceramic capacitor from BATT to GND for
proper stability. Use a 2.2μF ceramic capacitor for most
applications. Connect a 1μF ceramic capacitor from IN
to GND. A larger input capacitor can be used for high
charging current to reduce input voltage ripple.
Connect a 1μF ceramic capacitor from SAFEOUT to
GND. A larger bypass capacitor for SAFEOUT can be
used for optimum noise immunity. Ceramic capacitors
with X5R or X7R dielectric are highly recommended
due to their small size, low ESR, and small temperature
coefficients.
Thermal Considerations
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W are
available in thermally enhanced Thin QFN packages
with exposed pads. Connect the exposed pad to a
large copper ground plane to provide a thermal contact
between the device and the circuit board for increased
power dissipation. The exposed pad transfers heat
away from the device, allowing the IC to charge the
battery with maximum current, while minimizing the
increase in die temperature.
DC Input Sources
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W
operate from well-regulated DC sources. The full charg-
ing input voltage range is 4.25V (4.4V for MAX8845W
only) to 7.5V (8V for MAX8845X only). The device can
withstand up to 28V on the input without damage to the
IC. If V IN is greater than 7.5V (8V for MAX8845X only),
the internal overvoltage-protection circuitry disables
charging until the input falls below 7.5V (8V for
MAX8845X only). An appropriate power supply must
provide at least 4.25V at the desired peak charging
current and stay below 7V when unloaded.
Typical Application Circuits
AC Adapter Application
Figure 3 shows the MAX8845Z as a Li+ battery charger
with an AC adapter. The MAX8845Z detects the presence
of an input supply and DETBET, resulting in POK pulled
low. Once POK is pulled low, the autobooting assistant
drives ABO high (MAX8845Z) and enables the power
supplies of the system to boot up. The MAX8845Z begins
charging the battery when EN is low or unconnected. By
monitoring CHG , the system can detect the top-off thresh-
old and terminate the charge through EN . The
MAX8845Z/MAX8845Y/MAX8845X/MAX8845W also pro-
vide an overvoltage-protected SAFEOUT to the system.
Factory System Interface Connector Application
Figure 4 shows the MAX8845Z as an autoboot assistor
with the factory system interface connector. The
MAX8845Z detects the ABI input even though there is no
input voltage available and generates an ABO signal to
turn on power supplies to boot up the system. The con-
figuration in Figure 4 is used for system development,
testing, and calibrations in production or design stage.
USB-Powered Li-Ion Charger
The universal serial bus (USB) provides a high-speed
serial communication port as well as power for the
remote device. The MAX8845Z/MAX8845Y/MAX8845X/
MAX8845W can be configured to charge batteries at the
highest current possible from the host port. Figure 5
shows the MAX8845Z as a USB battery charger. To
make the circuit compatible with either 100mA or
500mA USB ports, the circuit initializes at 100mA charg-
ing current. The microprocessor then enumerates the
host to determine its current capability. If the host port is
capable, the charging current is increased to 450mA to
avoid exceeding the 500mA USB specification through
GPIO control. The MAX8845Z/MAX8845Y/MAX8845X/
MAX8845W also provide an overvoltage-protected
SAFEOUT to the system.
Recommended PCB Layout and Routing
Place all bypass capacitors for IN, BATT, and
SAFEOUT as close as possible to the device. Connect
the battery to BATT as close as possible to the device
to provide accurate battery voltage sensing. Provide a
large copper ground plane to allow the exposed pad to
sink heat away from the device. Make all high-current
traces short and wide to minimize voltage drops. A
sample layout is available in the MAX8845Z Evaluation
Kit to speed designs.
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8845ZETC+ | 功能描述:电池管理 28V Linear Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX8845ZETC+T | 功能描述:电池管理 28V Linear Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX8845ZEVKIT+ | 功能描述:电源管理IC开发工具 MAX8845Y/Z Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8847ZETE+ | 制造商:Maxim Integrated Products 功能描述:NEGATIVE CHARGE PUMP FOR 6 WLEDS - Rail/Tube |
| MAX8848YETE+ | 制造商:Maxim Integrated Products 功能描述:NEGATIVE CHARGE PUMP FOR 7 WLEDS - Rail/Tube |
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