LT1513IR#PBF

LT®1513 is a 500KHz current mode switching regulator specially configured to create a constant- or programmable-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. This can also drive a CCFL Royer converter with high efficiency in floating or grounded mode. 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 charging of NiCd, NiMH, lead-acid or lithium rechargeable cells, precision current limited power supply, constant-voltage/constant-current supply, transducer excitation, universal input CCFL driver.

• Charger input voltage may be higher, equal to or lower than battery voltage
• Charges any number of cells up to 20V, battery can be directly grounded
• 1% voltage accuracy for rechargeable lithium batteries
• 100mV current sense voltage for high efficiency
• 500KHz switching frequency minimizes inductor size
• Charging current easily programmable or shut down
• FB input current is 300nA typical (VFB=VREF, VIN=5V, VC=0.6V, VFB=VREF, IFB=0V)
• IFB input current is –200 to 0nA (VIFB=VIREF, VIN=5V, VC=0.6V, VFB=VREF, IFB=0V)
• 7-lead plastic DD package

附註

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