sorry for the late reply because of the Chinese new year holiday.
for this device, you should a small ceramic capacitor and a 100uF tantalum capacitor. pure ceramic capacitor could cause unstable problem in this device, refer the description in page…
i don't suggest two boost in parallel, because of current sharing problem: one go into current limit and the other only output several milliamp. please have a look at TPS61230 which can support 5V&1.5A from li-ion input.
thanks
Jasper Li
Other Parts Discussed in Thread: TPS61230 , TPS61232 Hi,
I recommended a customer download the footprints for the TPS61232 using Ultralibrarian and the .bxl files. However, when he tried to import them Allegro, he kept getting pad stack errors and then…
5V input logic is OK. the logic high voltage of the EN pin should be higher than 0.8*VBAT, so the 3.3V may be also OK depending on the battery voltage range.
you can have a look at TPS61230 or TPS61230A for this application condition
Hi
this capacitor should be also OK, just try it in the current board to check if the output ripple is acceptable to you.
no sure you why you select TPS61027. but you can have a look at TPS61252 or TPS61230. both devices support only ceramic capacitor…
it is no problem for TPS61230 to operates at the 1mF output capacitor, but you need to optimized the feed forward capacitor value. refer datasheet page 14 and SLVA289 application note
thanks
Jasper Li
Part Number: TPS61230A Other Parts Discussed in Thread: TPS61230 , , BQ25606 Problem:
The TPS61230 will not boost the input voltage. 3.5V @ 50mA limit is input from power supply. Output is also 3.5V. So, it appears that the input equals the output…
Hi Jasper,
Thank you very much for your response.
Please find attached our layout as well as the schematic.
Why do you think, that TPS61230 will be better solution?
Best Regards, Patrick
Hi Nicky,
The LMR62014 can not output 5.2V/0.8A from 2.8V input voltage because its switch current limit is only 1.4A. Please take a look at the Figure 22 in datasheet. I would suggest TPS61230, TPS61230A, or TPS612592. What is the application?
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I don't think that is feasible. If you could lower your output voltage to 5.5V, You could use a part with built in load disconnect like TPS61230. Otherwise you may want to consider a synchronous controller.
