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mister_e
- 12th April 2005, 22:23
Hi all,

i just need to know if someone here know some quad, octal or hex Buffer/Driver ICs that can drive AND sink at least 40-50ma at 5Volt(don't need to be a very high speed, maximum switching will be it's < 100KHZ). For the prototype i place a pair of digital transistors with built-in resistor but if i can place a ic instead it will save some space/parts on the boards.

thanks!

Melanie
- 13th April 2005, 01:10
ULN2003, ULN2004, ULN2803, ULN2804 to name but four... and they're rated to 500mA per channel.

NavMicroSystems
- 13th April 2005, 13:46
Hi Steve,

I just want to confirm what Mel has already said.

I have used hundreds of ULN2803, they are relatively inexpensive and they are bulletproof.

mister_e
- 13th April 2005, 16:43
yeah i already use those ULN but thanks. I was talking about something like 4051 but with a 40 mA and up DRIVE AND SINK at the same time capability on the same chip. BTW i'll stick with the digital transistor configuration.

some H-Bridge or combination of two ULN will also do the job but when you compare the pricing of transistors and those, you can save a few $

Well sometimes we can't find everything in a single chip ;)

Thanks again folks for your time.

Luciano
- 13th April 2005, 18:56
Hi!

4469 Line Driver - capable of driving highly capacitive,
inductive, or resistive loads with the ability to
source or sink up to 100ma current per output.

The line drivers are commonly used for encoder outputs.
The text below is from a manufacturer of encoders.

Luciano

* * *

5. Output ICís
Output ICís are available in either Line Driver (LD) or Open
Collector (OC) types. Open Collectors require pull-up resistors and
so have higher output impedance. In general it is recommended
to use a Line Driver style of output. They can either source or sink
current and their lower impedance mean better noise immunity
and faster switching times. Our applications specialists would be
pleased to discuss your system requirements and the compatibility
of your receiving electronics with Line Driver type outputs.


7272
Multi-voltage Line Driver: 100 mA source/sink. Input voltage 5 to
28 VDC standard (Note: Vout = Vin). Available with
voltage regulator for 5 to 28 VDC input/TTL output (called out as
a special feature). This driver is TTL compatible when used with 5
volt supply or with a voltage regulator option. Supply lines are
protected against overvoltage to 60 volts and reverse voltage.
Outputs are short circuit protected for one minute. Supply current
is 120 mA typical (plus load current). This is the recommended
replacement for 3904R and 7406R open collector outouts with
internal pullup resistors. This is also a direct replacement for any
4469, 88C30, 8830 or 26LS31 line driver


4469
Multi-voltage Line Driver: 100 mA source/sink. Input voltage 5
to 15 VDC standard (Note: Vout = Vin ). Available with voltage
regulator for 5 to 24 VDC input/5V output (called out as a special
feature). TTL compatible when used with 5 volt supply or with
voltage regulator. Supply lines are protected against overvoltage
to 60 volts and reverse voltage. Outputs are short circuit protected
for one minute. Supply current is 90 mA typical (plus load current).
This is the replacement for 3904R and 7406R outputs for systems
operating at 15 volts and below. This is also a direct replacement
for any 88C30, 8830, or 26LS31 Line Driver.
replaced by the 4469 or the 7272 in system upgrades, or with
the 7273 if external pull-ups are used.

mister_e
- 14th April 2005, 04:08
Really interesting, thanks Luciano!

Acetronics2
- 14th April 2005, 13:12
Also Available from microchip, the XX - 4426, 4427, 4428, widely spread twin Mosfet drivers, ref depends on inverting or not.
They also permi level shifting ...

Alain

Ron Marcus
- 14th April 2005, 15:35
Try the STmicro L293D. It will drive up to 600 mA in an H bridge fashion. It is simple and rugged. It also has built in diodes for inductive loads. Available @ Digi, or Mouser. The only down side is that it's current draw is on the high side. I use them by the fist full for robotics.

Ron

mister_e
- 14th April 2005, 17:48
Thanks Acetronics and Ron. In the meantime i also found TC1426 and TC1427 from Microchip.

mister_e
- 14th April 2005, 18:35
I was talking about something like 4051 but...

Doh.. i meant 4050.

Luciano
- 14th April 2005, 18:43
Hi!

Also available from Micrel Inc.
http://www.micrel.com

MIC4126/4127/4128
http://www.micrel.com/product-info/products/mic4126-7-8.shtml

MIC4126/4127/4128 Datasheet:
http://www.micrel.com/_PDF/MIC4126-7-8.pdf

MIC4467/4468/4469
http://www.micrel.com/product-info/products/mic4467.shtml

MIC4467/4468/4469 Datasheet:
http://www.micrel.com/_PDF/mic4467.pdf

Application Note 24
Designing with Low-Side MOSFET Drivers
http://www.micrel.com/_PDF/App-Notes/an-24.pdf

* * *

TelCom Semiconductor
Microchip Acquires TelCom Semiconductor
http://www.microcontroller.com/microcontrollers/news/C_microchip/o101027mcp_telcom.htm

TC1426 are from TelCom Semiconductor now Microchip.

* * *

regards,

Luciano