SN74CBT16292 max continuous output current

Arthur Huang

Other Parts Discussed in Thread: SN74CBT16292

Hi Team,

my customer is evaluating the SN74CBT16292 device, and they want to check with product team about the max continuous output current for total 12bit (all channels) and max output channel for single bit(one channel)? Please advise. Thanks.

Regards,

Arthur

over 7 years ago

0 Daniel Hartung over 7 years ago

TI__Mastermind 22135 points

Hey Arthur,

Looking at the datasheet I can see that the continuous channel current is 128 mA a channel max. Since the part is a switch and that current really just runs through the part, you can run every channel at that current and it won't damage the part (just make sure to not go over).

Thus:
Per channel max = 128 mA
Total max = channels*128 mA (So 1.536 A)

Thanks,
Daniel

0 Clemens Ladisch over 7 years ago in reply to Daniel Hartung

Guru 243830 points

P = R × I² = 7 Ω × (1.536 A)² ≈ 16.5 W

∆T = Θ_JA × P
in the DGV package: ∆T = 48 °C/W × 16.5 W = 792 °C

That's a sure way to release the magic smoke.

0 Daniel Hartung over 7 years ago in reply to Clemens Ladisch

TI__Mastermind 22135 points

Hey Clemens,

That equation is somewhat misleading as the current you have to square is actually the 128 mA and then multiply it over 12 channels.

Over 1 channels
P = R × I² = 7 ohms * (.128)*(.128) = .114688 W

Over 12 channels
P = 12*.114688 = 1.376256 W

∆T = ΘJA × P
in DGV package ∆T = 48 °C/W x 1.376256 = 66.1 °C

Not quite as bad as your answer, but certainly far more reasonable a value. Any solution that wants to run all the channels at max current will have to pay attention to the thermals.

Thanks,
Daniel

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SN74CBT16292 max continuous output current