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Anybody interested in MAX1763's? DC-DC converters

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A friend gave us a few of these very attractive MAX1763EEE-T DC-DC converters/regulators. (We also received some 2.4uH inductors, but I'm not sure if they will work with these.)

These are surplus from L3's nightvision manufacturing division.

 

2356.gif

 

The DC-DC converter boosts a one-cell to three-cell bat-
tery voltage input to a fixed 3.3V or adjustable voltage
between 2.5V and 5.5V. An external Schottky diode is
required for output voltages greater than 4V. The
MAX1763 guarantees startup with an input voltage as
low as 1.1V and remains operational down to an input of
just 0.7V. It is optimized for use in cellular phones and
other applications requiring low noise and low quiescent

current for maximum battery life.

It features constant-frequency (1MHz), low-noise

PWM operation with up to 1.5A output capability.

 

 

Specs:

0.7vdc to 5.5vdc input

2.5vdc to 5.5vdc output

1.5Amp output

 

MAX1763 datasheet here

 

There are several pros and cons:

 

Pros:

  • Small, compact size
  • Few external components required
  • Designed to run on one to three AA batteries
  • Resistor-controlled output voltage

Cons:

  • SMD (a heat gun works quite well for soldering)
  • Components have a very low maximum distance:
The MAX1763 has an internal 1.250V reference.
Connect a 0.22?F ceramic bypass capacitor to GND

within 0.2in (5mm) of the REF pin.

 

"Inductor Connection. Connect the LX pins together close to the device."

"Source of N-Channel Power MOSFET Switch. Connect both PGND pins together close to the device."

 

All of the cons would be overcome if we had some 2x2cm boards to install these on.

 

Anyone with SeeedStudio experience want to turn a proft?

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Now priced! We have almost a full reel (2044).

 

$1.5 apiece + $2.50 shipping (USPS padded envelope + static free packaging from the reel, and will pack as many purchased in an envelope as possible)

 

Message me with how many you want and I'll get back to you with paypal info.

 

Willing to trade some max1763's for boards to install some on...

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Looks like a nice chip, I can't think of any specific uses for myself though as I have some TPS61221's I've used for similar purposes (substantially less power but no need for more, powering MSP430's with reasonably small inductors).

 

Do you have any specific projects in mind for these? Seems like they'd make a superb portable LED lighting driver.

 

Sent from my Galaxy Note II with Tapatalk

 

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Also I guess that's the 16pin QSOP version, assuming the datasheet diagram refers to the QSOP then it's 0.635mm pitch which is easy peasy IMO with a soldering iron (I do TI's 38pin DA package which is 0.625mm or 0.635mm pitch TSSOP with no problem)

 

Edit: yep 0.635mm pitch (Maxim E16+1 package code)

 

Sent from my Galaxy Note II with Tapatalk

 

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Seems to me they would be great for generating 5v for an HD44780 LCD (especially one with a backlight), or what ever else needed 5vdc when even a single AA cell was the only source available (same goes for 3.3v). For that matter, since this provides 1.5amps, a USB port connector could be attached to it to create a quick single-use (AA side) cellphone charger.

Two potentiometer-adjustable 1763's on a small PCB with a 4-pin 90-degree header (common gnd, common input, out1 and out2) would be great for plugging straight into a breadboard socket.

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