LT1512CN8#PBF

LT®1512 is a 500KHz current mode switching regulator specially configured to create a constant-current/constant voltage battery charger. In addition to the usual voltage feedback node, it has a current sense feedback circuit for accurately controlling output current of a flyback or SEPIC (single-ended primary inductance converter) topology charger. In addition, these topologies allow charging even when the input voltage is lower than the battery voltage. Maximum switch current on the LT1512 is 1.5A. This allows battery charging currents up to 1A for a single lithium-ion cell. Accuracy of 1% in constant-voltage mode is perfect for lithium battery applications. Charging current can be easily programmed for all battery types. Typical applications are battery charging of NiCd, NiMH, lead-acid or lithium rechargeable cells, precision current limited power supply, constant-voltage/constant-current supply, transducer excitation.

• Charger input voltage may be higher, equal to or lower than battery voltage
• 1% voltage accuracy for rechargeable lithium batteries
• 500KHz switching frequency minimizes inductor size
• 100mV current sense voltage for high efficiency, battery can be directly grounded
• Charging current easily programmable or shut down
• Error amplifier transconductance is 1500µmho typical (∆IC=±25µA)
• Switching frequency range from 450 to 550KHz (2.7V ≤ VIN ≤ 25V)
• Minimum input voltage is 2.4V typical, supply current is 4mA (2.7V ≤ VIN ≤ 25V, TA=25°C.)
• 8-lead PDIP package
• Temperature rating range from 0°C to 70°C

附註

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