SMR with positive and negative headroom

B

Bruce Varley

Guest
Hi, I need to generate 5V, +/- 0.25V at about 10mA from a DC supply that can
range between 4.5 and 6.5 volts. Is anyone aware of a circuit for this,
switchmode preferred for efficiency reasons. TIA
 
Wouldn't that be called, adding a voltage regulator to the existing device?

"Bruce Varley" <bxvarley@weastnet.com.au> wrote in message
news:htSdnY1Kmfwc4gDVnZ2dneKdnZydnZ2d@westnet.com.au...
Hi, I need to generate 5V, +/- 0.25V at about 10mA from a DC supply that
can range between 4.5 and 6.5 volts. Is anyone aware of a circuit for
this, switchmode preferred for efficiency reasons. TIA
 
"-=Spudley=-" <-=Spudley=-@work.com> wrote in message
news:Z%pnk.26804$IK1.21459@news-server.bigpond.net.au...
Wouldn't that be called, adding a voltage regulator to the existing
device?
He said 4.5V in and at least 4.75V out...
 
"Bruce Varley" <bxvarley@weastnet.com.au> wrote in message
news:htSdnY1Kmfwc4gDVnZ2dneKdnZydnZ2d@westnet.com.au...
Hi, I need to generate 5V, +/- 0.25V at about 10mA from a DC supply that
can range between 4.5 and 6.5 volts. Is anyone aware of a circuit for
this, switchmode preferred for efficiency reasons. TIA
is MAX761 suited??
 
"-=Spudley=-" <-=Spudley=-@work.com> wrote in message
news:YZEnk.27111$IK1.13198@news-server.bigpond.net.au...
"Den" <Invalid@someemail.com> wrote in message
news:489ebbbd$0$8663$5a62ac22@per-qv1-newsreader-01.iinet.net.au...

"Bruce Varley" <bxvarley@weastnet.com.au> wrote in message
news:htSdnY1Kmfwc4gDVnZ2dneKdnZydnZ2d@westnet.com.au...
Hi, I need to generate 5V, +/- 0.25V at about 10mA from a DC supply that
can range between 4.5 and 6.5 volts. Is anyone aware of a circuit for
this, switchmode preferred for efficiency reasons. TIA


is MAX761 suited??

12Volts is a bit high for his needs

But perhaps an MAX619 with a suitable zener regulator on the input to
limit the input voltage to the device for a maximum of 3.6 Volts.
Perhaps you are right, although the data states 5V is within the range
(5V<-->16.5V) of the '761 when in the "adjustable" configuration.
 
"Den" <Invalid@someemail.com> wrote in message
news:489ebbbd$0$8663$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
"Bruce Varley" <bxvarley@weastnet.com.au> wrote in message
news:htSdnY1Kmfwc4gDVnZ2dneKdnZydnZ2d@westnet.com.au...
Hi, I need to generate 5V, +/- 0.25V at about 10mA from a DC supply that
can range between 4.5 and 6.5 volts. Is anyone aware of a circuit for
this, switchmode preferred for efficiency reasons. TIA


is MAX761 suited??
12Volts is a bit high for his needs

But perhaps an MAX619 with a suitable zener regulator on the input to limit
the input voltage to the device for a maximum of 3.6 Volts.
 
"Den" <Invalid@someemail.com> wrote in message
news:489f9041$0$8689$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
"-=Spudley=-" <-=Spudley=-@work.com> wrote in message
news:YZEnk.27111$IK1.13198@news-server.bigpond.net.au...

"Den" <Invalid@someemail.com> wrote in message
news:489ebbbd$0$8663$5a62ac22@per-qv1-newsreader-01.iinet.net.au...

"Bruce Varley" <bxvarley@weastnet.com.au> wrote in message
news:htSdnY1Kmfwc4gDVnZ2dneKdnZydnZ2d@westnet.com.au...
Hi, I need to generate 5V, +/- 0.25V at about 10mA from a DC supply
that can range between 4.5 and 6.5 volts. Is anyone aware of a circuit
for this, switchmode preferred for efficiency reasons. TIA


is MAX761 suited??

12Volts is a bit high for his needs

But perhaps an MAX619 with a suitable zener regulator on the input to
limit the input voltage to the device for a maximum of 3.6 Volts.



Perhaps you are right, although the data states 5V is within the range
(5V<-->16.5V) of the '761 when in the "adjustable" configuration.
That's a Red Herring.
 

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