Hi all,
I have an application using the LTC4011 battery charger IC from Linear Technologies. I will be using this IC to charge 3 NiMH from a 24V external input. The batteries power a wireless chip (3.6V max), motor and some other stuff.
The LTC4011 has "Power path control" (excuse me for using Linear's marketing terminology) which switches the power supply presented to the system load. If the external 24V is available the system will run off that whilst the batteries are charging. If the external 24V is not available then the batteries are used.
My question is this: What is the best way to regulate the power supply presented to the system load. The wireless can only take 3.6V max therefore putting 24V across it will fry it. As this is a battery powered device the solution must draw a minimal current.
Should I use a 3.6V linear regulator and allow it to drop out of regulation when the external power is removed? Will there be a power penalty for that?
Schematic below
Thanks in advance,
Tim
I have an application using the LTC4011 battery charger IC from Linear Technologies. I will be using this IC to charge 3 NiMH from a 24V external input. The batteries power a wireless chip (3.6V max), motor and some other stuff.
The LTC4011 has "Power path control" (excuse me for using Linear's marketing terminology) which switches the power supply presented to the system load. If the external 24V is available the system will run off that whilst the batteries are charging. If the external 24V is not available then the batteries are used.
My question is this: What is the best way to regulate the power supply presented to the system load. The wireless can only take 3.6V max therefore putting 24V across it will fry it. As this is a battery powered device the solution must draw a minimal current.
Should I use a 3.6V linear regulator and allow it to drop out of regulation when the external power is removed? Will there be a power penalty for that?
Schematic below
Thanks in advance,
Tim