Hi,

I need to charge a 5mF capacitor from an input voltage (28V-56V) to the same output voltage.

I want to use LTC3649 to precharge this capacitor at a constant current (between 1-- 2 A).

I think to choose RSET= 1.1M Ohm and Cset = 100nF.

Is-it possible…

Hi. To calculate a switching loss for LTC3649 I need to know gate charge of top and bottom power switches, but this information is not provided in datasheet. How should I evaluate switching loss?

Hello,

I would like to build proposed lab power supply based on LTC3649. In the datasheet note, there is simple schematic, where I found a diode:

Is this diode a zenner one with 40V or just simple rectified diode?

Diode is connected between Iset and…

I am designing in LTC3649 for 5-12V input to various (on same board) output voltages: 1.0, 1.8, 3.0, 3.3.

I do not have any other 100nF capacitors on this board. I am using 2.2uF 25V X5R 0402 capacitor (Murata # GRM155R61E225KE11D) as my all-around general…

Hi, 

Trying to replicate LTC3649 circuit from datasheet p. 20.  When powering it with no load and with no commanded voltage on TRACK pin - crcuit starts ok, but when powering with load (220 ohm res for test) and  commanded 0.75V on TRACK pin - LTC3649 just…

INPUT VOLTAGE is 27V,and set output to 21V,the result  turn out to be 26V,INTVCC is 25.6V,is the chip broken?

LTC3649 how do i control the current overshoot when using current limit featuresame problem with LTM8064

Dear Power by Linear,

     I've designed the LTC3649 into a medical device whose tip is connected by a cable that could be two meters long (by my estimate - my customer cannot be more exact.) A footswitch enables a relay which connects or disconnects the…

Hi,

Trying to simulate downloaded LTC3649_DC2112A.asc and it gives strange result:

Just added current limit resitor 80k to limit current at 1A. At moderate loads (ie 2ohm) it works as expected. But when output is shorted (~0.1ohm)  simulator shows 4A current…