Which wireless charger IC is good for charging LIR1220 batteries?

The LTC4123 output voltage is fixed at 1.51V, and is designed to charge NiMH-chemistry cells.  If you are looking to wirelessly charge a Li-ion cell to 4.2V, you should consider the LTC4120-4.2.

Is LTC4120-4.2 is good for charging LIR1220 since its  charge constant current

is about 1.6mA.

On Mon, Apr 16, 2018 at 9:53 PM, WATaylor <

For such a small charging current (1.6mA), the LTC4120-4.2 is not a good choice; the LTC4120 is designed to charge at 50-400mA.  Analog Devices is working on a lower-charging-current part for small lithium-ion cells which should become available very shortly.  What is the expected annual useage (EAU) for your application?

Our application now is for medical use BTLE Ring. If we consider other

market use coming year expectation can be around 1000pcs.

Is this new low power charger IC will be pin to pin compatible to LTC4120

or will it be with lower external parts as in LTC4123?

On Tue, Apr 17, 2018 at 10:55 PM, WATaylor <

Dede,

If you respond to this email with your contact information, I can see that preliminary datasheets for 2 new wireless receiver parts are sent to you.

Regards,

Bill Taylor

Senior Applications Engineer

Analog Devices