Questions tagged [pmic]

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Choosing a Power-Management solution - Integration level [closed]

I am looking for a power management solution with (for all requirements see below): "Power Path" (automatically switch between USB power and battery) Battery charger (single cell LiPo) ...
Johannes's user avatar
  • 279
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1 answer
45 views

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 ...
battu balaji's user avatar
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1 answer
39 views

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, ...
Ram prakash's user avatar
1 vote
1 answer
40 views

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 ...
uz3il's user avatar
  • 103
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37 views

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, ...
AbdAllah Talaat's user avatar
1 vote
1 answer
71 views

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 ...
tronhawk's user avatar
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0 answers
16 views

Charging voltage across VM and VSS of AP9221SA-CC-HAC-7 is 0.6V even when USB charger is inserted

I am using AP9221SA-CC-HAC-7 PCM IC with 1-cell Li-ion battery (4.2V). I have battery charger (RT9471) after PCM IC and load connected after battery charger. The PACK+ and PACK- signals go the the ...
Vedashree's user avatar
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20 views

PMIC using AP9221SA-CC-HAC-7 not allowing charging

I am using AP9221SA-CC-HAC-7 PCM IC with 1-cell Li-ion battery (4.2V). I have battery charger (RT9471) after PCM IC and load connected after battery charger. The PACK+ and PACK- signals go the the ...
Vedashree's user avatar
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0 answers
31 views

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 ...
Hari's user avatar
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111 views

Do I need a PMIC on an ESP32 audio player?

I am designing a small audio player for my daughter, based on a TTGO T-Display. It will have a few buttons for control and to select playlists. It will have an SD card reader and two MAX98357 ...
francisaugusto's user avatar
1 vote
1 answer
113 views

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 ...
torosluadam's user avatar
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42 views

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 ...
Juanma's user avatar
  • 360
2 votes
2 answers
640 views

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 ...
Mutski's user avatar
  • 39
1 vote
1 answer
86 views

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 ...
MadHatter's user avatar
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2 votes
2 answers
2k views

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 ...
Maurício Tochetto's user avatar
3 votes
4 answers
385 views

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 ...
Drakes's user avatar
  • 259
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1 answer
223 views

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 ...
ABSTONE's user avatar
  • 17
1 vote
0 answers
163 views

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 ...
Aarav Soni's user avatar
0 votes
3 answers
34 views

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?
Adam Lee's user avatar
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