• RE: LTC3789 inrush current issue

    Hi Ken,

    I have been told that you got support separately for this inquiry.  This is considered close.

  • LTC3789 failures

    We are using the LTC3789 alonside the LTC4000 in an arrangment which is identical to the DC1721A-A Demo board (schematic and layout) for a LiFe battery charger and portable radio PSU application. Unfortunately we have had half a dozen failures of the…

  • LTC3789 Paralleling


    I design DC/DC power supply with two interleaved LTC3789`s.

    DC/DC specification:

    1. Vin=9-36V
    2. Vout=18V
    3. Iout = 30A
    4. Fsw = 400 kHz
    5. External Spread-Spectrum Sync

    My schematic based on DC2253A reference design.
    Single channel circuit design and component…

  • LTC3789 design question

    hi all,

    the new  project  :  VIN=18~36VDC      VOUT=28V   IOUT=5A

    the LTC3789 is appropriate choice? and also the other better applications for me? thanks a lot.

    best regards


    Hi, my name is Juan

    Im using the LTC3789 with the LTC4000. I simulate the circuit on the LTSpice but it doesn´t work when I connect the ITH of the LTC3789 with the ITH pin of the LTC4000. If i dont connect one with the other averything Works well till…

  • LTC3789 or LT3790 Sync to external clock

    LTC3789 (PLL) or LT3790 I need to use external Sync of 250KHz and move to 255KHz. what would be the expected settling time in each component to the new switching frequency? 


  • LTC3789空载发热严重

    用LTC3789实现输入14-19V 输出15V 3.5A。芯片一上电(用VCC=16.5V测试) 空载电流有200mA 导致芯片发热严重,请教有什么原因导致.下面给出原理图与PCB。

  • LTC3789电路 经常烧坏MOSFET


       采用了LTC3789推荐电路设计的一款12V电源,该电源用于整车上,输入电源即为蓄电池(7-16V),在GND采用了MOSFET作为防反接,负载为2-3R加热线,采用200HZ的PWM控制,但是目前在使用上发现三例功率MOSFET(SIR442DP) Q5损坏且芯片EXTVCC管脚与GND短路,现象如下

    损坏后的MOSFET呈以下特性:1、用万用表二极管档测量:VDD-S 为无穷大,VDS-D :0.376V,栅极测量正常,芯片EXTVCC与GND直流阻抗为(正反向)19.58R;


  • How to calculate LTC3780, LTC3789 Ith Pin filter?


    Could someone be so kind as to explain how the RC filter is derived for the Ith Pin?  One example shows an 8k and 2200pF, and another example has a 15k and a 10nF.  Then a third example has a 68k and 3300pf.  The datasheet explains it is a current…

  • LTC3789不利用其它芯片能否控制输出电流