CXLB7370通过USB和AC适配器为单芯锂电池充电。它还包括电池输入电源切换，因此，系统可以直接由电源供电，而不是由电池供电。在最简单的应用中，CXLB7370不需要外部MOSFET或二极管，可接受高达6.5V的输入电压；然而，高达18V的直流输入过电压保护可添加一个SOT PFET。片上热限制简化了PC板布局，并允许最佳充电速率，而不受最坏情况下电池和输入电压的热限制。当达到CXLB7370热极限时，充电器不会关闭，而只是降低充电电流。可使用外部热敏电阻监测环境或蓄电池温度。当温度超出范围时，充电暂停。其他特性包括STAT 1和STAT 2输出，指示各种充电状态。直流电源正常（DCOK）、USB电源正常（UOK）和通电（PON）输出指示何时存在有效电源。这些输出驱动逻辑或功率选择mosfet，以断开充电源与负载的连接，并保护CXLB7370免受过电压的影响。CXLB7370不包含与USB主机通信的逻辑。它必须从本地微控制器接收指令
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产品概述 返回TOP
The CXLB7370 charges a single-cell Li+ battery from both USB and AC adapter sources. It also includes batteryto-input power switchover, therefore, the system can be powered directly from the power source rather than from the battery. In its simplest application, the CXLB7370 doesn’t need external MOSFET or diodes and accepts input voltages up to 6.5V; however, DC input over-voltage protection up to 18V can be added with a single SOT PFET. On-chip thermal limiting simplifies PC board layout and allows optimum charging rate without the thermal limits imposed by worst-case battery and input voltage. When the CXLB7370 thermal limit is reached, the charger does not shut down but simply reduces charging current. Ambient or battery temperature can be monitored with an external thermistor. When the temperature is out of range, charging pauses. Other features include STAT 1 and STAT 2 outputs indicating various charge status. DC power-OK (DCOK), USB power-OK (UOK), and poweron (PON) outputs indicate when valid power is present. These outputs drive logic or power-selection MOSFETs to disconnect the charging sources from the load and to protect the CXLB7370 from overvoltage. The CXLB7370 doesn’t contain logic for communication with the USB host. It must receive instructions from a local microcontroller. The CXLB7370is available in 16-pin 5mmx5mm QFN and 4mmx4mm TQFN packages and operates over the -40°C to +85°C temperature range.
产品特点 返回TOP
· Charge from USB or AC Adapter
· Accurate BATT Regulation Voltage
· Programmable DC Charging Current
· Selectable USB Charging Current (Either 100mA or 500mA)
· Thermal Regulation for Simplified Board Design
· Input Protection Up to 18V
· Soft-Start
· External Thermistor Monitoring
· Charge Shutdown Control
· Charge Status Outputs
· DC and USB Power-OK Indicators
· Small, High Power QFN5x5-16 and TQFN4x4-16 Packages
· Lead Free and Green Devices Available (RoHS Compliant)
应用范围 返回TOP
· Smart Phones and PDAs
· Wireless Appliances
· Digital Still Camera
· Internet Appliances
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产品封装图 返回TOP
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Battery Charger > Linear Charger |
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|
Part_No |
Package |
Input Voltage(V) |
Quiescent Current (uA) |
Charge Current (max)(A) |
Battery Charge Voltage |
VIN OVP |
USB Input |
Battery-Load Switch |
Charge State Output |
|
|
min |
max |
|||||||||
|
4.35 |
6 |
2000 |
1000 |
4.2 |
Y |
Y |
Y |
Y |
||
|
DFN3x3-10 |
4.35 |
6 |
2000 |
1000 |
4.2 |
N |
N |
N |
Y |
|
|
SOT-23-5 |
4.35 |
6 |
300 |
500 |
4.2 |
N |
N |
N |
Y |
|
|
DFN3x3-10 |
4.35 |
6.5 |
300 |
500 |
4.2 |
N |
N |
N |
Y |
|
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