Michael Watterson wrote:
>> I'm looking for a 5V out switching regulator with a quiescent current=20
>> of<1
>> mA, capable of supplying 300 mA. It should operate across a wide voltage
>> range, from 8V up to 32V, and be able to survive 36V. It must also be=20
>> small,
>> and cheap.
>>
>> We did our prototyping with Seiko's S-8520:
>>
>> http://datasheet.sii-ic.com/en/switching_regulator/S8520_8521_E.pdf
>>
>> It's a nice little device, but it has two big flaws: it can only go up t=
o
>> 16V, and it has a three month lead time.
>>
>> I understand some of you chuckled in disbelief, or even rolled on the=20
>> floor
>> laughing after reading the first paragraph (you know who you are), so le=
t=20
>> me
>> relax the requirements a little bit:
>>
>> I would be OK if I could find a regulator that accepts 8-18V on the=20
>> input,
>> and survives 24V for 10 minutes, as long as it meets the quiescent=20
>> current
>> spec. I'm even OK with adding cheap external components to shut off the
>> regulator if the voltage exceeds 16V.
>>
>> Thank you in advance for your help.
>>
>> Vitaliy
>>
> 8V to 36V is doable. Lets you use really flat 12V car battery or madly
> excited 24V Truck electrics.
>
> series transistor or linear regulator to power low power < 1mA SMPSU IC
> that uses one external FET switch.
> max of about 30mW in your series linear supply for SMPU IC and the
> external fet can easily do 0 to 500mA at even 60V in
>
> If you wanted it in one part with only a couple of caps and one coil I'd
> think that's harder.

Part numbers/circuit examples/application notes?

Vitaliy=20

--=20
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