Power management forum - Recent Threads

TPS2121: Need automotive alternate parts

Nanje Gowda H N — Tue, 10 Mar 2026 07:25:49 GMT

Part Number: TPS2121

Need automotive grade supporting alternate parts
1: TPS2121RUXT

Foot prints and pin compatibility are preferred.

TPS65222-Q1: Request for Pin Number Information for TPS65222‑Q1 (Pinout Not Provided in Datasheet)

Naveen Kumar C — Tue, 10 Mar 2026 06:53:55 GMT

Part Number: TPS65222-Q1

Please provide the pin numbers for all the pins shown in the TPS65222‑Q1 simplified application diagram (attached).
The datasheet lists pin names but does not provide the pin number mapping.

Needed Information:
Pin numbers for signals such as:
PVIN_B1/B2/B3/B4, VCCA, VIO, nINT/EN_DRV, nRSTOUT, PVIN_LDO12, PVIN_LDO3, VMON1, GPIOx, EN/PB/VSENSE, SCL_I2C1/SCK_SPI, SDA_I2C1/SDI_SPI, SW_B1–B4, FB_B1–B4, VOUT_LDO1–LDO3, VOUT_LDOVINT, GND, etc.

Reason:
Required urgently to create the symbol and proceed with schematic design.

Priority: High
Attachment: TPS65222‑Q1 tps65222-q1.pdf

UCC28180: High Voltage Boost Converter with UCC28180

Furkan Karacal — Tue, 10 Mar 2026 06:43:01 GMT

Part Number: UCC28180

Hello.

I plan to design a PFC boost converter. I wonder if UCC28180 is the correct one for this use. Can you verify it can be used for my project? Are there better options for high output voltage?

Project's specs are;

Universal grid input 85-265VAC (Rectified)
550-800VDC output
200W output power
Output capacitor has to be 66uF, no less no more

Thank you.

Kind Regards;

Furkan Karacal

TPS62162: WEBENCH POWER DESIGNER Simulations failed

Mikeda — Tue, 10 Mar 2026 06:08:07 GMT

Part Number: TPS62162

Hello TI team,

My customer wants to use the TPS62162 with below condition.

Input:12V, Output:3.3V, Iout:160mA max, L:2.2uH, Cout:22uF to 44uF

So I would like to try to confirm the performance of this configuration by using WEBENCH POWER DESIGNER. I think it is working property about "CUSTMIZE" and "EXPORT". But it seems "SIMURATE" does not work. WEBENCH POWER DESIGNER returns the message "Simulation Failed - Sim type:...."

How should I solve this problem?

Best regards,

Mikeda

TPS53647: TINA-TI and Orcad Export Fails

TI-CSC — Tue, 10 Mar 2026 05:59:31 GMT

Part Number: TPS53647

Hello E2E Experts,

When I try to export TINA TI and OrCAD Export of files failed. The simulation works within Webench. I cleared cache also and tried still fails.

Regards,

TICSC

TPS25990: difference between PTPS25990ARQPR and TPS25990ARQPR

Soorya S — Tue, 10 Mar 2026 05:58:02 GMT

Part Number: TPS25990

Hi Respected what is the difference between PTPS25990ARQPR and TPS25990ARQPR because unable to find PTPS25990ARQPR in the given datasheet, and in the provided datasheet TPS25990ARQPR is mentioned

both are same part or different? and all the attributes like body marking, thickness,moisture sensitivity level, tape width,tape pitch, pin 1 orientation quadrant are same or not

LM5176: Input Ceramic Capacitor Failure

Andrea Hwang — Tue, 10 Mar 2026 05:39:28 GMT

Part Number: LM5176

I have some spark and fire at the input capacitor C7~9 while working. USB C for notebook charging.

Please check my schematics when you can access it. I cannot upload picture..

TLV1117: New version of TLV1117 incompatible with old version

Richard Cabot — Tue, 10 Mar 2026 05:33:51 GMT

Part Number: TLV1117

TI revised the design of the TLV1117 LDO regulator. The new chip design requires a lower ESR output capacitor. The new one doesn't work with most aluminum capacitors and the old one doesn't work with most ceramic capacitors.

We have the part in production with an aluminum capacitor on the output. The spec sheet implies the new part won't work in the existing board.

We are designing a new board for use in a new product. It will use ceramic capacitors. It appears that design could not use old parts.

How sensitive are the parts to ESR?

How do we tell if we have a new part or an old part? Is there a date code or some other identifier?

Changing something as fundamental as the capacitor requirements on an existing part seems like a very poor decision. I discovered the problem only because I was working on a new design. Otherwise we would have found it only when production units started failing.

TPS631012: Output voltage accuracy

Kaji@PAN — Tue, 10 Mar 2026 04:41:02 GMT

Part Number: TPS631012

Hello,

I am an FAE at a distributor that handles TI products.
I received the following question from my customer.

The output voltage was measured during the product inspection process.
When the output voltage was set to 4.2V, 4.137V was detected.
This occurred in one unit out of 3,000 units inspected.
The output voltage variation of other products has been around 4.18V to 4.22V.

I checked the datasheet to see if it had any information about output voltage accuracy, but the electrical characteristics didn't include that information.

Could you provide information about the output voltage accuracy?
By the way, the customer is testing with no load and FPWM is disabled.

Best regards,

LMG708B0: RTM schedule

Jeff YANG — Tue, 10 Mar 2026 04:10:24 GMT

Part Number: LMG708B0

Hi,

May I know the LMG708B0 RTM schedule?

Thanks!

Jeff

TPS631012: Question about TPS631012YBGR

Jimmy Huang — Tue, 10 Mar 2026 03:55:50 GMT

Part Number: TPS631012

Hello:

Would you please provide the detailed packaging specifications of TPS631012YBGR as follows for part number application:

Material packaging type
Tape width (mm)
Tape component pitch (mm)
Pin 1 position of components on the tape
Tape material

I can't find this information in Datasheet, Please help support, Thanks!!!

TIDA-00243: Wireless Charging Solution

Francis Jiang — Tue, 10 Mar 2026 02:47:53 GMT

Part Number: TIDA-00243
Other Parts Discussed in Thread: CC1101

Hi Team,

Do we have next gen wireless charging solution? Customer choose CC1101 for communication and wolud like to find a power IC for charging. Thanks in advance.

BRs,

Francis

TPS7A4501-SP: Operation Below the Specified Minimum Temp (TPS7A4501DCQ)

EISEI SHUDO — Tue, 10 Mar 2026 00:48:52 GMT

Part Number: TPS7A4501-SP

We have used TPS7A4501DCQ on many programs.

Their ambient temperature requirements were -40 to +80 deg C.

A new program will start soon, and its requirement is -45 to +80 deg C.

I want to continue using TPS7A4501DCQ for the new program because we are familiar with it, however the datasheet shows the operating temperature range is -40 to +125 deg C.

Does TPS7A4501DCQ actually operate at -45 deg C?

BQ25883: BQ25883 - Strange behavior - Vsys drops to 0V with no battery

Mike Sprauve — Tue, 10 Mar 2026 00:40:09 GMT

Part Number: BQ25883

Hi,

I am seeing very strange behavior with the BQ25883, some of the anomolies is that it keeps entering into Hi-Z state and not charging when there is a battery plugged into the circuit. But when there is no battery, Vsys starts at ~5V then drops down to under a volt. I was under the impression that with Vusb present, that Vsys would be present to power the system. I have attached a screenshot of my circuit for reference.

TPS25983: TPS259830 Faults during startup with surge current

Randy Holmberg — Mon, 09 Mar 2026 23:06:44 GMT

Part Number: TPS25983
Other Parts Discussed in Thread: AM69

Description of Issue

The TPS259830 is being used to switch 24V power to our AM69 compute module board. The AM69 compute module board is similar to the AM69 evaluation board with a PMIC that is turning on when the 24V supply is under 5V. The peak value of the current spike does not appear to be close to the limit which is intended to be 14A.

Debug Notes

The AM69 compute module is being powered by a backplane with the TPS259830 Power Switch. However, we can also power the same board with the TPS259830 Evaluation board and observe similar issues in that we cannot get the switch to power the intended board without faulting out and latching power off. We have tried lots of combinations of retry, dv/dt settings and things with no success. The AM69 board will power up fine when connecting directly to a bench power supply.

TPS25751: Get source PDOs and set active PDO

Robert Van Rooyen — Mon, 09 Mar 2026 22:54:40 GMT

Part Number: TPS25751

I need a reliable way to determine when I can read the source PDOs for a connected device, monitor voltage/current, and select an active PDO that falls within my source power budget.

I am able to monitor live voltage/current, but I have not been unable to read the source PDO capabilities nor impose an active PDO, therefore some guidence is requested.

BQ28Z610-R1: BQ28Z610-R1 different ChemIDs

Mustafa Al-Katat — Mon, 09 Mar 2026 22:37:58 GMT

Part Number: BQ28Z610-R1
Other Parts Discussed in Thread: BQ24196

Hello,

We are trying to characterize a cell. Our current setup is 1s1p. Cell is 2500mAh @ 4.2V. Our fuel gauge is BQ28Z610-R1. Our charger is BQ24196.

We have run the a charge / relaxation / discharge / relaxation test in order to get a ChemID. The ChemID that was given to us by the GPC was 3536. However this was for a cell that is 4350mAh @ 4.35V. We proceeded with the learning cycle and noticed our FCC was being calculated to 2093mAh and our SOH was 79%. Since we could not get our SOH or FCC aligned with our needs we decided to start over and run a charge / relaxation / discharge / relaxation test. This time we were given a ChemID 3230. This ID is fora cell that is 2300mAH @ 4.35V. We again proceeded with the learning cycle and this time noticed our FCC was being calculated to 2121mAh and our SOH was 84%. A bit better than before but not our ideal condition.

My question is how can I ensure I'm being given the correct ChemID. We believe the we're not using the correct ChemID and it is affecting our SOH and FCC.

TLV741P: COO Inquiry

Jolaine Lin — Mon, 09 Mar 2026 21:59:17 GMT

Part Number: TLV741P

Hi,

Please advise what is the country of origin for this component: TLV74133PDBVR, please?

BQ25570: Can I use the BQ25570 in non-power-path mode?

David Isbister — Mon, 09 Mar 2026 21:52:21 GMT

Part Number: BQ25570

I have an application which may need more than the 110mA output of the BQ25570. Could I just connect my application to VSTOR or VBAT, and skip using the output buck converter?

TPS1210-Q1: Charge pump / BST capabilities

Jonathan Linderich — Mon, 09 Mar 2026 21:11:04 GMT

Part Number: TPS1210-Q1

Hi expert,

I would like to use the TPS1210-Q1 for a pre-charge application, where the SRC pin will be high for long periods of time. Is the charge pump for the bootstrapped supply able to supply enough energy if the SRC pin is high? Is the charge pump referenced to GND?

Best regards,

Jonathan

BQ25720: BQ25720 - BSM & Register mapping

Harini S — Mon, 09 Mar 2026 19:08:02 GMT

Part Number: BQ25720
Other Parts Discussed in Thread: BQSTUDIO

Hi Team,

We are currently using a 65W adapter from a third-party vendor available in the market. When we connect this adapter to our laptop, we are facing several issues.

When the battery RSOC reaches around 5%, the laptop sometimes shuts down automatically. If we apply a high system load, the laptop quickly goes to mechanical off (G3 state). After this happens, we must unplug and reconnect the adapter to power the system again.

During battery discharge from 5% to 0% under heavy load, our laptop does not show lag, but benchmarking laptops usually reduce performance to maintain backup time. In our case, the system continues running at high load, which causes the battery to discharge very quickly. When the battery reaches around 1%, the system shuts down and enters G3 state, and again we must unplug and reconnect the adapter and battery.

This behavior makes it seem that the firmware operation during battery charge and discharge cycles is unstable.

Additionally, when we connect the adapter at 0%–1% battery level, we are seeing three pop-up notifications. This issue is observed only with the particular adapter we are using. After crossing the 10% we are not gettin the pop erros. We suspect that the battery charger IC (BQ25720) may be triggering some register mismatches or configuration issues, and there might be a firmware-level configuration required.

Also, in the BMS application, we cannot find the BQ25720 device in the supported device list. Could you please help us by sharing the latest version of BQStudio so that we can read and verify the BQ25720 register values?

In the meantime, I will share the charger register configurations currently used in our firmware (.h and .c files) for further analysis.

chg_setting.min_vsys = 0x5C00; // 9200 mV
chg_setting.iin_host = 0x4100; // 3.2A
chg_setting.input_vol = 0x0000;
chg_setting.vmin_ap = 0xC200; //1100 0010
chg_setting.charge_option0 = 0x070E;
chg_setting.charge_option1 = 0x3B00;
chg_setting.charge_option2 = 0x00B7;
chg_setting.charge_option3 = 0x0474;
chg_setting.charge_option4 = 0x2048;
chg_setting.prochot_option0 = 0x4A81;
chg_setting.prochot_option1 = 0x41A0;

Kindly review and let us know the required register configurations for the BQ25720 charger IC when using a 3S1P battery pack with 12.6V maximum voltage and 4000mAh capacity.

UCC28951-Q1: Configuration for PSFB converter without synchronous rectifiers

Bright Robert — Mon, 09 Mar 2026 18:22:12 GMT

Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28951

Dear TI Applications Team,

I am designing a phase shifted full bridge converter using the UCC28951 with the following specifications:

Input: 110 V DC nominal (80-160V range )
Output: 110 V DC, 21 A
Purpose: galvanic isolation
Power level: ~ 2.3 kW

I would appreciate clarification on several points regarding the controller configuration.

1. Secondary topology

Instead of using a center tapped secondary with synchronous rectifier MOSFETs, can the converter be implemented with the following below while still using the UCC28951 as the primary controller?

a two wire transformer secondary
followed by a full bridge diode rectifier

2. Configuration when synchronous rectifiers are not used

If synchronous rectifiers are not used:

how should the following pins be configured or terminated?

- ADEL
- ADELEF
- DELAB
- DELCD
- DELEF

My understanding from the datasheet is that these pins program the adaptive delays between primary and secondary switches, particularly between OUTA / OUTB and OUTF / OUTE.

What is the recommended configuration if OUTE and OUTF are unused?

3. Efficiency impact

If a full bridge diode rectifier is used instead of synchronous rectification:

what efficiency reduction should typically be expected at approximately 2.3 kW output power?

4. Gate drive routing

In my layout, the gate drive signals from the external gate drivers to the MOSFETs have different trace lengths:

Gate A trace: 50 mm
Gate B trace: 30 mm

Since the 50 mm trace cannot be reduced, is it acceptable to increase the shorter trace using serpentine routing to match the longer one?

The PWM outputs OUTA through OUTD drive external gate drivers, each driver providing two outputs.

5. Trace length matching for synchronous rectifier outputs

If synchronous rectifiers are used:

do the trace lengths of OUTE and OUTF need to be matched to the trace lengths of OUTA through OUTD,
or is it sufficient to only match traces within each switching pair?

I would appreciate it if you could please respond line by line to each numbered question for clarity .

Kind regards,

Bright

LMR60430-Q1: Switching Node Ringing is around 400MHz

Vinyas Shetty — Mon, 09 Mar 2026 17:59:58 GMT

Part Number: LMR60430-Q1

While probing the Switch Node, we oberserved the ringing around 400MHz at all Battery voltages from 9V to 16V.We are planning to place an Snubber on switch node. Please review our layout and let us know where would the best place to snubber and let us know if should remove the test point to improve return path

BQ79731B-Q1: Comparation MPN BQ79731BQPHPRQ1 vs BQ79731PHPRQ1

Christian Lopez — Mon, 09 Mar 2026 17:33:39 GMT

Part Number: BQ79731B-Q1

We need to know what the difference is between these two MPNs, and what the 'BQ' refers to.

MPN1: BQ79731BQPHPRQ1

MPN2: BQ79731PHPRQ1

BQ27Z561EVM-011: BQ27Z561EVM-011 in bqStudio

Eddie Mercado — Mon, 09 Mar 2026 17:31:45 GMT

Part Number: BQ27Z561EVM-011
Other Parts Discussed in Thread: BQSTUDIO

Hi,

This is my first time using bqStudio. Aside from the Chem ID, what/how must I change/configure in bqStudio to set up the chip to ONLY read Voltage, Current, and external thermistor temp? All other features are not needed.

Thanks!