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- Voltage detector IC  
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- 1-Cell Li+ Battery Charger IC
- 2-Cell Lithium Battery Charger IC
- Multi-Cell Li+ Battery Charger IC
- LA Battery Charger IC
- LiFePO4 Battery Charger IC
- Solar Panel-Powered Charger IC
- NIMH/NiZn Battery Charger IC
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- WLED Driver
 
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- N-channel MOSFET
- P-channel MOSFET
 
- Amplifiers
 
CN3601
PFM Step-down Single-cell NIZn Battery Charger IC
Product Profile
   Reference articles
 
General Description:
CN3601 is a fixed off-time PFM mode step-down battery charge management IC with operating voltage range between 2.7V to 6.5V. It is specially designed for single-cell NIZn battery charge management with fewer external components. CN3601 adopts constant current and maintenance mode to charge battery.
On power up, CN3601 enters constant current charging mode, the on-chip P-channel MOSFET is turned on, inductor current rises. When inductor current reaches upper threshold, the P-channel MOSFET is turned off, a low-side switch is turned on, inductor is discharged, then the P-channel MOSFET is turned on again after 1.5us off time. When battery voltage rises to 1.77V (Typ.), CN3601 enters maintenance mode, in which the inductor current’s upper threshold is reduced, in the meantime a timer is started. The charge process will not be terminated until the time out occurs or battery voltage reaches its highest value. In termination mode, the P-channel MOSFET is turned off, there is no current flowing into battery. When BAT pin voltage falls below recharge threshold, the CN3601 enters charge mode again. CN3601’s switching frequency can be up to 500KHz, which makes a small-profile inductor usable.
The other features include 2 open-drain status indications, chip over temperature protection, inductor current’s upper threshold selection, etc.
CN3601 is available in thermally-enhanced 8-pin eSOP package.
Applications:
Standalone NIZn Battery Charger Flashlight
Toys Car Models
Features:
Input Voltage Range:2.7V to 6.5V
Operating Current:320uA@VIN=5V
Suitable for Solar Panel-Powered Applications
Switching Frequency up to 500KHz
Maintenance Charge Mode to Guarantee Fully-charged Battery
Selectable Upper Threshold of Inductor Current
Charging terminated by Timer or Battery Voltage
Automatic Adaptability to Input Supply with Limited Driving Capability
Indicators for Charge and termination status
Maintenance Charge Mode(Timer Termination)
Automatic Recharge
Available in SOP8/PP Package
Pb-free, rohs compliant and Halogen free
 
Application Note:
 
 
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