Part Number: TSS721A
Hello,
I am designing an M-Bus slave powered by a Texas Instruments TSS721A. I would like to charge a single Eaton 0.47 F, 5 V supercapacitor from the TSS721A STC output.
The available STC current is approximately 1–2.6 mA, with a normal voltage of 5.6–7.5 V and a possible no-load clamp up to approximately 11.5 V. The supercapacitor should be charged to approximately 4.2–4.5 V and must not discharge back into STC when the M-Bus is disconnected.
Could you recommend an TI IC, topology, or reference design that provides:
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Input current limited to approximately 1–2 mA.
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Startup with the supercapacitor at 0 V.
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Very low quiescent current.
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Reverse-current blocking.
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Compatibility with the TSS721A STC voltage and current limits.
I am particularly concerned about startup current, repeated hiccup, and backfeeding from the supercapacitor into STC.
Thank you in advance.
Best regards,
Jose.
