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Product Information
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PFM Step-down Single-cell NIMH Battery Charger IC
Product Profile
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General Description£º
CN3600 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 NIMH battery charge management with fewer external components. CN3600 adopts constant current and maintenance mode to charge battery.
On power up, CN3600 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 2us off time. When battery voltage rises to 1.36V (Typ.), CN3600 enters maintenance mode, in which the inductor current¡¯s upper theshold 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 CN3600 enters charge mode again. CN3600¡¯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.
CN3600 is available in thermally-enhanced 8-pin eSOP package.
Standalone NIMH Battery Charger Flashlight
Toys Car Models
Input Voltage Range£º2.7V to 6.5V
Operating Current£º320uA@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£º
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