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TPS543620: device recommend (urgent)

Nan Zhang
Intellectual 1895 points
Part Number: TPS543620
Other Parts Discussed in Thread: TPS54824, TPS56837

Hi team,

     Could you please help me to find a device to meet the customer need? I want to recommend the TPS543620, but it does not support the light mode. The frequency of SW is first priority for customer. And then size, light mode and 100% duty cycle.

最小供电电压[VDD(Min.)] ≤4.5V
最大供电电压[VDD(Max.)] ≥17V
最小输出电压[Vout(Min.)] ≤0.6V
最大输出电压[Vout(Max.)]  
最大输出电流[Iout(Max.)] ≥6A
反馈电压[VFB] 0.6V
最大工作频率[Freq] ≥1M
最大占空比[Duty Cycle(Max.)] better to have 100 duty cycle
工作模式[Mode] Synchronous
集成电感[Built-in Inductors] NO
集成MOS[MOSFET Integrated] yes
轻载模式[Light- Load Mode] yes
热关断[Thermal Shut Down] yes
过流保护[OCP] yes
最低工作温度[Ta(Min.)] -40℃
最高工作温度[Ta(Max.)] 85℃
长(Typ.)[Length(Typ.)] ≤3mm
宽(Typ.)[Width(Typ.)] ≤2mm
安装方式[Mounting Type] SMD
器件封装[Package] QFN

YOURS

NAN

  • 0
    TI__Expert 7320 points

    Hi Nan,

    Our US team will check your question and reply you soon.

  • 0
    TI__Guru 56985 points

     

    Looking over our product offerings, their best bet would likely be the TPS54824, but it's a little bigger at 3.5 x 3.5.

    It offers high switching frequency, light load auto-skip, and very high duty cycle with a boot-strap circuit that allows 100% duty cycle until the boot-strap discharges below 2.4V, then it will generate a minimum OFF time to recharge the bootstrap capacitor.  Selecting a larger boot-strap capacitor will allow the duty cycle to approach closer to 100%.

    Can they accept the slightly larger package?  I'm not seeing anything rated for 17V input and 6A output in a 2mm x 3mm package.

  • 0 in reply to Peter James Miller
    TI__Intellectual 1895 points

    Hi Peter,

          The tps54824 is nice. But it could not support the light load with high efficiency.Do we have such device?

          For the size, i will discuss whether they can accept the larger package.

    YOURS

    NAN

  • 0 in reply to Nan Zhang
    TI__Guru 56985 points

     

    My apologies about that, I thought the part I was looking at had auto-skip light load efficiency, but it appears I was mistake.

    Looking through our other 6A and 8A converters with light load efficiency, I think the TPS56837 offers the highest possible duty cycle, with a minimum off-time of 180ns.  

    The TPS56837 is in a 3mm x 3mm package.