TPS61169: Recommended device

Hi Zeming,

May I know how many LEDs in one string? I need to decide whether it's a buck or boost topology.

BR

Patrick

Hi Patrick,

Sorry, 6pcs of white LED in series per ch. I think it should be buck.

But the customer prefers simple solution, the current is also not very large (60mA), thus do we have any linear device for this case?

Best,
Zeming

Hi Zeming,

Is the LED Vf = 3V? I'm afraid using linear drivers will leave too much voltage on IC pins which will influence the system efficiency.

And will customer consider using single channel LED drivers which will be simple and have more choices?

BR

Patrick

Hi Patrick,

Yes, VF is about 3V. Multichannel is better considering the size and cost. We need a simple system thus efficiency can be lower prioritized.

I am thinking if TPS92638-Q1 is good, please let me know if you have other suited solution, both linear and SW will be helpful.

Best,
Zeming

Hi Zeming,

Let me search our devices and give you feedback later.

BR

Patrick

Hi Patrick,

Any update?

I also found TPS61199 as buck topology option. So I plan to propose TPS61169 and TPS92638-Q1.

Hi Zeming,

Sorry for the late. Will customer also consider the automotive devices?

BR

Patrick

Yes, automotive is acceptable.

And sorry TPS61169 is boost device, it is not suitable. 

Hi Patrick,

Thank you, I have talked to the customer, he thinks he can add resistors to drop down the voltage to reduce the heat in TPS92638-Q1.

We can close the thread, I will email you and your team if I need more support.

Best,
Zeming