Re: 300 mA from a microcontroller pin

On Nov 29, 12:38 pm, Tomás Ó hÉilidhe <t...@xxxxxxxxxxx> wrote:
I have a 14-pin PIC microcontroller, the 16F684 to be exact. Each pin
can be either 5 V, 0 V or high impedance, however they can only source or
sink 25 mA, but I need 300 mA (both sourced and sunk). Currently, I'm
using a setup consisting of an NPN and a PNP transistor in order to
provide more current, like so:http://img124.imageshack.us/img124/6215/
driverbeforegj7.jpg (the microcontroller is on the far left).

I've heard of things called "drivers" that can be used to boost the
current, whilst still being able to provide the three states of 5 V, 0 V
and high impedance. I've searched the web and come across things like the
ULN2003 the MAX15025, but I'm having difficulty finding what I want. It
seems that the ones that can provide enough current can only source
current, while the ones that can source and sink tend not to be able to
provide enough current.

Can someone please suggest a driver chip so that I can effectively
get 300 mA out of my microcontroller pins? Remember that I need the three
states.

A quick google search using "300ma 3 state driver" gives a link to an
Intersil device for the second hit.

http://www.intersil.com/cda/deviceinfo/0,1477,EL7232,00.html#data

A little overkill on peak, it provides 2A peak, but only 100mA
continuous so it depends on what you are driving.

What are you driving?

Robert
.

Relevant Pages

  • Re: 300 mA from a microcontroller pin
    ... I've heard of things called "drivers" that can be used to boost the current, whilst still being able to provide the three states of 5 V, 0 V and high impedance. ... It seems that the ones that can provide enough current can only source current, while the ones that can source and sink tend not to be able to provide enough current. ... Can someone please suggest a driver chip so that I can effectively get 300 mA out of my microcontroller pins? ...
    (comp.arch.embedded)
  • Re: High voltage open collector output w/logic inputs?
    ... driver that can sink, say, 100mA, can stand off, say, 32V, and is controlled by a logic level (5V or 3.3V CMOS) input? ...
    (sci.electronics.components)