How big are these FETs?  Are they just logic inputs or real drivers?  
These aren't drivers that must switch simultaneously, are they?

There are drivers which are simply buffers/inverters to go from say 3.3v 
to 15v.  Microchip makes a bunch.

There are logic-level FETs which can switch just fine with only 3.6v.  
Some can switch many amps.  That might be something to look into, simply 
replacing what you're driving with something that doesn't need its own 
15v gate driver.

Danny

Richard Crossley wrote:
> No 5V supply, just 3.6V and 15V.
>
> A push-pull output would be way preferable to an open collector output to
> get the FETs switching at a good speed, I'm really looking for a single chip
> solution if at all possible.
>
> Cheers,
>
> Richard.
>
>   
>> -----Original Message-----
>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
>> Behalf Of peter green
>> Sent: 02 November 2008 12:47
>> To: Microcontroller discussion list - Public.
>> Subject: Re: [EE] 3.6V logic to 15V
>>
>> Richard Crossley wrote:
>>     
>>> Hi,
>>>
>>> Been a while since I had to get my hands dirty and do any electronics
>>>       
>> design
>>     
>>> so hopefully this will have an obvious answer.
>>>
>>> I have three lines of 3.6V logic that I need to translate to around
>>>       
>> 15V
>>     
>>> levels, two of which also need to drive high voltage FETs so they
>>>       
>> really
>>     
>>> need to be able to both sink and source to overcome the gate
>>>       
>> capacitance and
>>     
>>> achieve reasonable (sub microsecond) switching times (I know 15V
>>>       
>> drive for
>>     
>>> the FET is 'overkill' but there is a lot of legacy CMOS logic in the
>>> system). The board area is very pushed for size so I was hoping there
>>>       
>> would
>>     
>>> be some monolithic interface circuit that could achieve this rather
>>>       
>> than
>>     
>>> discrete components.
>>>       
>> If you have a 5V supply availible and the 3.6V logic can supply
>> sufficiant current then a 74LS06 or 74LS07 (the only difference is one
>> is inverting the other isn't) running on 5V and with a pullup to 15V on
>> the outputs would do nicely for getting the levels to 15V.
>>
>> As for the FET drive your best option is probablly a 15V CMOS buffer.
>>
>>
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>
>
>   

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