TPS2549-Q1: CTL Pin Related Queries

Kenichiro

Part Number: TPS2549-Q1

[ TPS2549-Q1 ] Pin Related Queries

Hi,

Can you help to support this query from my customer?

<CTL Input Voltage>:

Since the input threshold of CTLx pins are somewhere around 1.3V, so my customer ties these pins to 3.3V power rail.
Is it mandatory to conect these to IN?

Thanks,
Ken

over 7 years ago

0 Aramis P. Alvarez over 7 years ago

TI__Genius 10370 points

Hi Kenichiro,

Welcome to e2e! Our engineering experts are currently on a holiday and will be back on Monday, Oct. 9th, and respond to your question then :-)

0 Yongqiang Sun over 7 years ago

TI__Intellectual 2685 points

Hi,

The CTL pins can be connected to any rails higher than 2V.

0 Kenichiro over 7 years ago in reply to Yongqiang Sun

Mastermind 9165 points

Yongqiang, Thanks!!

0 Ryuuichi machida over 7 years ago in reply to Kenichiro

Guru 12650 points

Hi,

Sorry to interrupt you.
But let me confirm about below as well.

>The CTL pins can be connected to any rails higher than 2V.
In this case, is there no requirement for power-up sequnece ?
If CTL signal is input before supply voltage is supplied to USB 5V (IN pin), is there any problem from view point of operation ?
I'm concerned about there may be power-up sequnce in this case.

Best Regards,

0 Yongqiang Sun over 7 years ago in reply to Ryuuichi machida

TI__Intellectual 2685 points

Hi,

1. if EN pin is connected to VIN, it is Ok to power CTL pins first and then power VIN.

2. if EN pin is connected to an external GPIO, power CTL pins and VIN before powering EN pin.

if I answered your question, please kindly click the "Verify" button, thank you so much.

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TPS2549-Q1: CTL Pin Related Queries

[ TPS2549-Q1 ] Pin Related Queries