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LT1510/LT1511/LT1512 Battery charger IC

1. Can we create a PV based battery charger using LT1510/LT1511/LT1513? The input voltage will be connected to a PV panel of appropriate spec. Is there any additional thing to be taken cared of?

LT1510 is a current mode PWM step- down switcher where the internal switch is capable of handling 1.5A current. 2. If we need higher current capability is there any way to interface an external switch? 

The switch inside IC is an NPN transistor although the switching frequency is 500kHz.We studied usually for high switching frequencies we prefer MOSFET, 3. Is there any reason for using BJT for 500kHz switching?

Additional questions
[edited by: divyaks at 7:52 AM (GMT 0) on 28 Jan 2019]