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LM3647IM Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3647IM Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 17 page  ©2000 National Semiconductor Corporation www.national.com LM3647 Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries 1.0 General Description The LM3647 is a charge controller for Lithium-Ion (Li-Ion), Nickel-Metal Hydride (Ni-MH) and Nickel-Cadmium (Ni- Cd) batteries. The device can use either a pulsed-current charging or a constant-current charging technique. The device can also be configured to discharge before charg- ing. Throughout the charging sequence the LM3647 mon- itors voltage and/or temperature and time in order to terminate charging. s Negative delta voltage (- ∆V) s Maximum voltage s Optional: Delta temperature/delta time ( ∆T/∆t) s Optional: Maximum temperature s Backup: Maximum time If both voltage and temperature fail to trigger the termina- tion requirements, then the maximum time (configured by external hardware) steps in which terminates the charging. In Ni-Cd/Ni-MH mode, four different charging stages are used: s Soft-start charge s Fast charge s Topping charge s Maintenance charge In Li-Ion mode, four different charging stages are used: s Qualification s Fast Charge Phase 1, Constant Current s Fast Charge phase 2, Constant Voltage s Maintenance charge The charge current of the LM3647 is configured via exter- nal resistors, which in turn controls the duty cycle of the PWM switching control output. For cost-sensitive applica- tions, the LM3647 charge controller can be configured without a temperature sensor and to use an external cur- rent source. PRELIMINARY March 2000 When using an external current source, the current is con- trolled by the LM3647 which turns the current source on and off. The LM3647 automatically detects the presence of a battery and starts the charging procedure when the bat- tery is installed. Whenever an error occurs (e.g., short cir- cuit, temperature too high, temperature too low, bad battery, charge time over, etc.) the LM3647 will stay in error mode until the battery is removed or it gets within the al- lowed charging temperature range. The LM3647 is avail- able in a standard 20-lead SOIC surface mount package. Key Features s Auto-adaptive fast charge s High-resolution, accurate voltage monitoring prevents Li-Ion undercharge or overcharge s Fast charge, pre-charge and maintenance currents are provided. Different currents are selectable via external resistors. s Fast-charge termination by ∆ temperature/∆ time, maxi- mum voltage, maximum temperature, negative ∆ volt- age and maximum time s Dynamically detects battery insertion, removal, short circuit and bad battery without additional hardware s Supports charging of battery packs with 2-8 cells of Ni- Cd/Ni-MH or 1-4 cells of Li-Ion s Three LED indicators and Buzzer output indicate oper- ational modes s Ni-MH/Ni-Cd charge mode, Li-Ion charge mode or dis- charge mode can be selected manually s PWM switching controller Applications s Battery charging systems for: — Portable consumer electronics — Audio/video equipment — Communications equipment — Point of sale devices — Power tools — Personal convenience products |
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