LMG1210: Current and voltage requirements-LDO Bypassed

Hi Sai,

thanks for reaching out about LMG1210!

1)     When the LDO or VIN pin is bypassed the VIN pin can be tied to VDD. VDD will need decoupling caps so it can source the high peak source and sink current. The frequency times the gate charge will determine the average gate current which is what will be drawn from the VDD pin along with the VDD and HB dynamic current which also depends on switching frequency. There is also VDD and HB quiescent current when the part is not switching. Check out the following app note for more details on how to calculate the current drawn from LMG1210 to help with driver power loss. Please let me know if you have any question on this.

http://www.ti.com/lit/an/slua942/slua942.pdf

2)     The voltage range that can be applied to the EN pin is the same as HI because they are the same pin in their respective PWM and Independent Input modes. The range can be found in section 6.1 or 6.3 of the datasheet and is 0-10V.

3)     The amount of current needed to bias the EN pin will be the EN voltage divided by the 200kohm input resistance which is 50uA max. This is all the current required to keep the voltage steady however the input can handle a higher peak current for faster input edges.

Let me know if this helps answer your question or you have any more questions.

Thanks,