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
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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
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 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 |
|
