https://e2e.ti.com/support/power-management-group/power-management/<p style="display:none;">blank</p>en-USTelligent Community 13https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654432/tps7b8550evm-power-good-behavior-on-ldo-tps7b8550/6381705Sat, 13 Jun 2026 02:10:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:9e35eb2f-7410-4827-b82a-e12f6fbb4b89Eduardo LinaresHello Dominykas, I’m going to contact our design group about this. Vout and Pg are internally connected internally, and I would not be surprised if that first voltage spike is causing parts of the circuit to turn on correctly while others do not. It is provably better to separate enable and VIN when you don’t have a monotonic startup like this and wait to pull enable high after VIN has settled. Regards, Eduardo Linareshttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1650351/lm317-psrr-of-new-and-legacy-lm317-s/6381687Sat, 13 Jun 2026 00:19:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:0d54853d-c281-46a8-8650-0f7246004822John WaltonYeah, I would like to know why the datasheet is incorrect on this important parameter.https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1655095/tps53647-rst_vout_i-fault-on-tps53647Fri, 12 Jun 2026 23:21:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:1cf8afcd-842f-4d75-83dc-c50dfd55b7f1Phillip LamPart Number: TPS53647 When I enable the regulator I see this RST_VOUT_I assert. My reset pin is floating, so not sure if this affects this or not. The other thing is I have about 6.2mF at my output. I suspect it is an in-rush thing, but when I try to set the slowest soft starts setting I still get this fault asserting. The other thing too which is a separate issue is that I have an electronic load trying to draw 60A, but for some reason the load can only pull 28A. I suspect it has something to do with this fault, but I am not certain. I will try to verify my e-load again, but last time I used it on the TPS53647EVM-710, I could draw 50+ amps. For some reason I see a different behavior on my board. I see no other issues and the voltage seems to be holding up with the 28A load. I don&#39;t see any OCP faults/warning or under voltage. The only fault I see is RST_VOUT_I.TPS53647EVM-710Data center &amp; enterprise computingTPS53647https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654268/tps7e81-pspice-model/6381666Fri, 12 Jun 2026 23:15:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:9f3eeb35-7481-4d9c-992b-7151791de209Alex DavisHi Keith, TPS7B91 currently doesn&#39;t have a model. I&#39;ll need to look into whether there&#39;s an existing model that&#39;s close to it. When we do release the model for it, it will support floating operation. Best Regards, Alex Davishttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1655094/ref34-ref34-disabled-outputFri, 12 Jun 2026 23:12:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:177a60a4-c7d6-4a6a-8d4e-940ee31ae865Validation BillPart Number: REF34 I am wanting to use the REF34 to add an additional range for a DAC that has an internal reference that has its reference powered on by default. Would it be possible to have REF34 output connected, but disabled? I know I will have to properly sequence disabling the DAC&#39;s internal reference before I enable REF34. The DAC&#39;s reference is lower than the REF34 VIN and its output.REF34https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1653900/bq25172-how-to-prevent-unintended-charging-during-mcu-reset-gpio-undefined-state-on-ts-pin/6381661Fri, 12 Jun 2026 22:58:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:46a2d052-daeb-485c-bf43-e5767dc30c2aBill JohnsHi Goto I tested the circuit in the lab and it needs a little work. Want to double check setting -- The +5V will power charger and MCU?https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1653542/ucc21550-q1-achieving-100-duty-on-bootstrapped-high-side/6381642Fri, 12 Jun 2026 22:30:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:47930118-7227-4980-810c-df7bdfa605c5Will AppeltHi Michael, The image below from the datasheet shows how to configure two isolated biases to generate a negative voltage on VSS. If negative voltage is not needed, then you can replace VA- and CA2 as a short circuit. For recommendations on how the isolated bias circuit can be set up, feel free to check out some of our team&#39;s bias devices online, and open an e2e thread for any that might work for your system, and an expert on bias supplies can help answer any questions you may have about their implementation. Some of the commonly used devices in our bias portfolio have the following names: SN6501, UCC33xxx, UCC34xxx, and UCC35xxx. Best regards, Willhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654204/bq25750-charging-at-lower-limit-i-e-400ma/6381640Fri, 12 Jun 2026 22:27:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:b4d65684-b36e-4e0d-9c53-669974b32316Ethan GallowayHello Saravana, Thanks for the new information. I&#39;m measuring this in the lab and I&#39;m only seeing the inrush current when the converter turns-on to start charging the battery in forward mode. Can you share your schematic with me? I want to check the schematic to make sure there are no issues with the input and output sense resistors. Best Regards, Ethan Gallowayhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654007/ucc23513-ucc23513dwyr-what-is-wrong-with-my-gate-drive-circuit/6381637Fri, 12 Jun 2026 22:22:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:a505f72f-50ef-493b-8646-9e3d9f99b993Will AppeltThanks for following up, glad to know it works!https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654503/bq25756evm-transient-while-starting-to-charge-the-battery/6381631Fri, 12 Jun 2026 22:16:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:1f89b957-ce60-4419-9826-db9c1f8fcd76Ethan GallowayHello Jay, Thanks for the new information. I&#39;m not seeing this behavior still. I have a few questions to help debug this: Are you measuring this on the EVM? Just to be sure, are you using a battery as the load? Did you use the ICHG resistor or the ICHG_REG register to control the current? How long are the wires connecting the EVM to the battery? Best Regards, Ethan Gallowayhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654746/tps568231-feed-forward-cff-capacitor-range/6381623Fri, 12 Jun 2026 22:06:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:06cb23f4-a78e-4306-bd8b-be00090f17f8Calan ElayaHello, The table above provides the recommended range for CFF based on VOUT and FSW conditions. If your design is stable with 56pF after verifying through stability tests, then 56pF is ok. Thank you, Calanhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654972/tps56a37-why-rfbt-need-0805-package/6381617Fri, 12 Jun 2026 22:03:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2bd62767-e3ea-4541-b389-832105960a6cCalan ElayaHello, RFBT does not necessarily need 0805 package. The EVM uses 0603 package. Does this help answer your question? Thanks, Calanhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1655049/tps65219-alternative-with-an-additional-buck-converter/6381615Fri, 12 Jun 2026 22:03:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:dffa2776-c43a-4f0b-bd04-688f748a3c9dJason MaxwellHi Sarah, Thank you for that response. What would we need to do to adapt the TPS65224 to the AM625? Best, Jasonhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1655029/tlvm14406-missing-sync-pin/6381612Fri, 12 Jun 2026 22:02:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:857b269a-372a-4887-8fdd-778804524ec5Jason MaxwellGreat, thank you Hardit. I had found the TPSM64406E, which was extremely expensive for the customer&#39;s application, and the TPSM64404, but not the 06, so I appreciate you pointing that device out as an option. Best, Jasonhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654610/tps28225-ic-fet-dead-issue/6381597Fri, 12 Jun 2026 21:48:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:02797068-8c28-4cec-8ebf-e4d5d1ee74d3Amy WozniakHi Jade, They can share their waveforms directly on this forum with no issues :) 1. When you say that they give 24V to UGATE, I don&#39;t understand what conditions you&#39;re talking about. Do you mean that when 24V is applied between BOOT-PHASE? And this causes the high side FET to fail drain to gate? 2. What is Vout? Do you mean the swtiched node? What is HGATE? If they are experiencing failures, perhaps we should move this discussion to email. Best, Amyhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654979/bq40z50-r2-update-status/6381589Fri, 12 Jun 2026 21:45:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:cad76085-1d0b-445b-acf9-868116a33067Alan FriasHello Ankita, [quote userid=&quot;682502&quot; url=&quot;~/support/power-management-group/power-management/f/power-management-forum/1654979/bq40z50-r2-update-status&quot;]I do not want to perform Chemistry ID matching, calibration, and voltage settings again. So, is the method I am following correct, [/quote] -You could upload your 4S3P .srec into your 4S1P pack but you would need to modfiy the design capacity mAh &amp; cWh, Qmax, chg &amp; dsg current threshold, quit threshold and any parameters associated with capacity. Set the update status to 0x02 and redo a learning cycle. Also it might still be necessary depending on the differences of hardware being used Thank you, Alanhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1652598/tps28225-inquiry-regarding-tps28225-operating-frequency/6381587Fri, 12 Jun 2026 21:42:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:e83a46a8-dc63-4de0-8dff-16132e511e06Amy WozniakHi Grady, Yes, this gate driver can drive any kind of FETs. Just note that LMG1210 is only able to drive a gate voltage of up to 5.5V. Depending on the MOSFET, this can be ok, but LMG1210 is optimized for GaN. Best, Amyhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1653956/bq25630-maximum-duty-cycle-for-the-buck-adjustment-on-the-charging-ic-bq25630/6381585Fri, 12 Jun 2026 21:40:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:1e9dcac5-6657-46ec-9200-2ae42a68493cGarrett KregerHi Kailun, Please see my comments below. The disconnect between the output of the theoretical equation and the sleep mode falling threshold is the BQ25630 is forced to start reducing output current as input voltage reduces. It reduces output power consumption in an effort to keep buck converter active. For example, I tested with a BQ25630EVM and charge current begins to reduce from 2A when VBUS falls to less than 350mV above VBAT. With that behavior in mind the necessary input voltage to ensure efficient operation at set output load is closer to the value output from the calculation you included. Best Regards, Garretthttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1654588/lm27222-gan-driver/6381583Fri, 12 Jun 2026 21:36:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:37804f09-9c7c-4db3-9789-a840330b9585Amy WozniakHi James, I&#39;m not sure I understand the topology you&#39;re using. Can you send a block diagram or a schematic? Best, Amyhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1651643/am67-am67-power-sequence-clarification/6381579Fri, 12 Jun 2026 21:33:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:441fc6eb-ddde-4f64-9f70-d1117f8e1eeaBrenda Diaz&quot; VMON_ER_VSYS&quot; is not tied to the sequence. It is sometimes included in the sequencing diagram as a visual representation (If &quot; VMON_ER_VSYS&quot; is connected to VSYS, they ramp together). Thanks, Brenda