Questions tagged [pmic]
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17 questions
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Buck-boost output drops when loaded
The LTC3566, a PMIC intended for battery and USB supplied applications, integrates a battery charger, a power path and a buck-boost converter. For my board, I copy-pasted the schematic found on the ...
- 179
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Why is the BQ25895 default system voltage 3.5V not 3.3V?
Why is the default system voltage 3.5V, not 3.3V even though, for example, the STM32 maximum voltage is 3.6V, but nominal is 3.3V?
BQ25895 datasheet.
0
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Parallel resistor across inductor practical model - switching converter [closed]
While designing switching converter, I have included the inductor practical model as shown in the image. Since Rvar2 is small value and in the order of milli-ohm. I see it is impacting my circuit ...
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PMIC PCA9450B Not Working
The PCA9450B is utilized to power up the iMX8 Mini Processor chip, which incorporates multiple voltage regulators. However, I am experiencing issues with the output voltages on the output side, ...
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1
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49
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How to ensure a simple power sequence of a processor without a PMIC?
I need to integrate a video processor on a PCBA (part number: AllWinner S3, overview). It requires several power rails, and the power sequence is as follows:
Power on:
Power off:
(page 380/384 of ...
- 447
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TNY268 switch when connecting HV then stop switching, not sure of EN/UV correct operation
I am trying to design a simple power supply using TNY268, I connected the circuit as follows:
Where the input of the attached schematic is connected to the output of a bridge and smoothing capacitor, ...
- 123
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106
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Is it possible to use BQ25629 as both a lipo battery charger and a stable output regulator?
I am a bit confused looking at the datasheet for the TI BQ25629 with regards to the SYS output voltage. Essentially, I have a 3.7 nominal voltage 290 mAh lipo battery that needs to provide around 100 ...
- 261
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PMIC MIC23451 operating voltage range
I am using Microchip SOM module in my project. Not using all the things in the SOM.
So we are redesigning the board with necessary components for my application.
Below is block diagram shows the main ...
- 3,061
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1
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161
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How to connect in serial two 2S Battery pack but charge them seperately?
I want to create a circuit that has input 12V DC and uses this voltage both charging two 2S (7.4V Li-Ion without balancing wire with BMS Circuit on the pack) batteries and at the same time supplying ...
- 44
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Use power supply from Coral SOM or obtain from DCDC Converter?
I'm designing a carrier board for Coral SOM.
DCDC_3V3 and VDDA_1V8 are SOM outputs, according with Google, they are using PMIC BD71837MWV to get this outputs, but they are not using them in their ...
- 410
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2
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901
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Single chip power good IC?
It seems like there should be a million chips for this, but for the life of me can't find any. I'm looking for a small (SOT23 or similar size if possible) IC that provides an active high when the ...
- 39
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Solder pad with no copper circles inside?
I'm trying to use a ROHM BD9F800MUX (buck PMIC regulator with synchronous regulation.)
Upon looking at their footprint guide, it has something I have not seen before and is poorly documented.
It ...
- 3,586
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2
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BJT collector-emitter breakdown voltage
I'm developing a flyback converter with the FT838NB1 IC, and I got some doubts about the collector-emitter breakdown voltage of the integrated NPN switching transistor.
Absolute maximum ratings show ...
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4
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467
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Why is NMI commonly pulled high on many ARM SoC schematics?
I've noticed that "AP-NMI" is pulled high on several ARM SoC schematics, and it is pulled high by the real-time clock (RTC) voltage, which is an always-on power domain (battery backup). Why ...
- 279
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321
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TPS65233 LNB Circuit is drawing more current from supply
I have used LNB controller TPS65233 in my design. Input is 5.5V and Output: 13/18V. I am seeing access current drawn by the circuit when I give 5.5V input to the circuit and no load is connected to ...
- 27
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176
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MP2617H(PMIC) is not working
I am designing a PCB board for our vehicle tracking device. Here the device will track GPS location and send it to the user.
This is a battery operated device.
Our power station provides us 12v input ...
- 49
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3
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Interpreting thermal shutdown threshold values from TPS659037
I'm studying the datasheet of TI TPS659037 PMIC. The MIN / TYP / MAX values are throwing me off here. Are these 3 numbers indicating variations between every IC manufactured?
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