H bridge IC

[Kunal]

I need an H-bridge IC with these requirements

1) Shoot through current protection
2) supply > 15V
3) logic inputs Vih(min) = 2.6 or less
4) available in SM package
5) motor current > 500mA
6) Should not have external power FETs or bipolar. Thats the point of
the whole search

I have been searching for a long time now and havent found anything to
match my requirements.

 

[[email protected]]

I need an H-bridge IC with these requirements

I was looking for something similar (except I don't have requirements
for the 2.6V Vih), and I was recommended the Allegro A3948 or 3949. I
was primarily looking to migrate LMD1820x designs to all-SMD.

I chose the A3949, and it seems from a quick check of the datasheet
that it will meet your needs. Allegro was VERY responsive, I asked for
5 samples and had them on my desk inside three days. I'm waiting for
PCBs to arrive so I can test them... looks promising.

 

[Kunal]

The A3949 doesnt meet the Vih(min) spec for the sleep pin input. It is
2.7 V and I will control it using a Pic running on 3.3V. The PIC I/O
pin can therfore go down to (Vcc-0.7) = 2.6V.
Although both are worst case and it might work, I wont be comfortable
with it. I might also choose not to use the Sleep feature at all, but I
could find a better part, why not.

And just as a side note, If some of you are looking for similar specs,
I found other chips. Thes dont meet some spec or the other of mine, but
might be helpful to someone else looking for H bridge ICs.
1)LMD 18200 by National
2)Si9988 by Vishay
3)TPIC0108B by Ti
4)L6201/2/3 by sgs thomson
5)TLE 5206-2 by infenion ( this one meets my specs, but its so damn
hard to get hold of)
6)3953 by allergro

 

[John Popelish]

The A3949 doesnt meet the Vih(min) spec for the sleep pin input. It is
2.7 V and I will control it using a Pic running on 3.3V. The PIC I/O
pin can therfore go down to (Vcc-0.7) = 2.6V.

(snip)

That voltage spec includes a specified load current. How does that
specified current compare with the current needed by the A3949 for a
logic high input?

 

[Kunal]

Good point.
The PIC can source around ~3 mA when high, but the 3949 take in only
about 50uA. So I guess the PIC pin output will never fall as low as
2.6V and should reqmain relatively close to Vcc (3.3V).
Please correct me if I am wrong.

Kunal

 

[John Popelish]

Good point.
The PIC can source around ~3 mA when high, but the 3949 take in only
about 50uA. So I guess the PIC pin output will never fall as low as
2.6V and should reqmain relatively close to Vcc (3.3V).
Please correct me if I am wrong.

Kunal

I agree. The output voltage spec is a way if implying approximately
the channel resistance of the pull up mosfet. A 2.6 volt output from
a 3.3 volt supply while delivering 3 ma implies a channel resistance
of about (3.3-2.6)/.003=233 ohms. That resistance would drop only
about 12 millivolts with a 50 ua load, so you can expect a logic high
of about 3.29 volts.

 

[Kunal]

Hi,
Could you tell where this chip is available?
Its availability doesnt seem too good.

Thanks
Kunal