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LMR16020: efficiency only about 75% for 48V - > 12V
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BQ24168: What is the lowest operating voltage of BQ24168 battery?
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Looking for new alternative chips to support
Part Number:TCI6638K2K
Looking for new alternative chips to support: hardware coprocessors, including turbo decoders, fast Fourier transform (fft) coprocessors
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UCC27524A: Output pulse current capability and top metal pad function
Part Number:UCC27524A
Hello,
I am working on a gate driver design and have two questions. Can you help please?
1. The section 7.1 absolute max ratings of the UCC27524A datasheet shows that source/sink current should not exceed 5A for 0.5us. Can the device handle higher current for shorter duration as long as the I*I*t is within 5A*5A*0.5us = 12.5 A*A*us? For example, can the device operate safely with 6A for 10ns (0.36 A*A*us)?
2. The MSOP-powerPAD package of UCC27524ADGNR has exposed mental pad on the top case. Datasheet mentioned that the bottom pad is connected to device substrate but doesn't mention the top pad. Is the top pad electrically or thermally connected to the internal device? How effective can it be if a heatsink is mounted on the top pad? Is it electrically safe to connect the top pad to GND?
Thank you.
Best regards,
Zhenyu
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BQ77905: Best cross for S-8252ABH-M6T1U
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TPS2032: No Part Marking
Part Number:TPS2032
I need the actual part marking for the TPS2032D. We cannot verify where pin 1 is from looking at the D.S. and the physical part.
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TPS56637: Can the customer apply 3.3V external power to the buck converter output trace if Vin is open?
Part Number:TPS56637
Hi Expert,
The customer uses TPS56637 to configure a 3.3V Vout buck converter on their application board. So, normally they uses this converter to supply 3.3V power on their application circuit. However, there is a case that they want to apply 3.3V power by external source for test purpose. In this case, can the customer apply 3.3V external power to the output trace of TPS56637 buck converter?
In other words, can the customer apply 3.3V to SW node trace in case that there is no voltage applying on Vin and EN pin?
I think if Vin is not open and a current path can be assumed from Vout to Vin via body diode of high side FET, it can't be allowed. But if Vin is open, it maybe OK. Do you have any other concern about this use case?
Thanks for your help in advance.
Regards,
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BQ40Z80: Gauge roadmap download
Part Number:BQ40Z80
I remember that we could download the Gauge roadmap on TI's official website before, but can't find it now. Can someone help me?
Thanks a lot !
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TPS43060: Ripple on the voltage rails powered off from the output of TPS43060
Part Number:TPS43060
May I know the voltage expected at points 1,2,3 and 4 w.r.t. to Vout in the attached schematics. I have programmed the resistors to have 10v on the Vout and my VIN is 5v. Thanks
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TPS54302: Can the customer apply 3.3V external power to the buck converter output trace if Vin is open?
Part Number:TPS54302
Hi Expert,
This is a similar question on the thread linked below but target device is different.
https://e2e.ti.com/support/power-management/f/196/t/795968
The customer uses TPS54302 to configure a 3.3V Vout buck converter on their application board. So, normally they uses this converter to supply 3.3V power on their application circuit. However, there is a case that they want to apply 3.3V power by external source for test purpose. In this case, can the customer apply 3.3V external power to the output trace of TPS54302 buck converter?
In other words, can the customer apply 3.3V to SW node trace in case that there is no voltage applying on Vin and EN pin?
I think if Vin is not open and a current path can be assumed from Vout to Vin via body diode of high side FET, it can't be allowed. But if Vin is open, it maybe OK. Do you have any other concern about this use case?
Thanks for your help in advance.
Regards,
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TPS53014: Can the customer apply 3.3V external power to the buck converter output trace if Vin is open?
Part Number:TPS53014
Hi Expert,
This is a similar question on the thread linked below but target device is different.
https://e2e.ti.com/support/power-management/f/196/t/795968
The customer uses TPS53014 to configure a 3.3V Vout buck converter on their application board. So, normally they uses this converter to supply 3.3V power on their application circuit. However, there is a case that they want to apply 3.3V power by external source for test purpose. In this case, can the customer apply 3.3V external power to the output trace of TPS53014 buck converter?
In other words, can the customer apply 3.3V to SW node trace in case that there is no voltage applying on Vin and EN pin?
I think if Vin is not open and a current path can be assumed from Vout to Vin via body diode of high side FET, it can't be allowed. But if Vin is open, it maybe OK. Do you have any other concern about this use case?
Thanks for your help in advance.
Regards,
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BQ27542-G1: Flash Update Params
Part Number:BQ27542-G1
Hello,
I am using BQ27542-G1 and STM32L4+ microcontroler using I2C to manage my Li-Polymer Battery,
I have to update Some BQ parameters according to my Battery settings, theses parameters are :
#define BQ27542G1_DESIGN_CAPACITY_VALUE (0x0960) /* 2400 mAh */
#define BQ27542G1_DESIGN_ENERGY_VALUE (0x2198) /* 8600 mWh */
#define BQ27542G1_DESIGN_VOLTAGE_VALUE (0x0E74) /* 3700 mV */
#define BQ27542G1_V_AT_CHG_TERM_VALUE (0x1068) /* 4200 mV */
#define BQ27542G1_TERMINATE_VOLTAGE_VALUE (0x0BB8) /* 3000 mV */
#define BQ27542G1_CHARGING_VOLTAGE_VALUE (0x1068) /* 4200 mV */
#define BQ27542G1_OT_CHG_VALUE (0x01C2) /* 450 0.1°C */
#define BQ27542G1_OT_DSG_VALUE (0x0258) /* 600 0.1°C */
Based on linux drivers available under this link ( http://www.ti.com/tool/bq27xxxsw-linux) I have developed my own code source that allows me to:
- UnSeal Data Flash memory and Verify Control Status register
- Read Data memory Block (using DataFlashClas, DataFlashBlock, DataFlashData and DataFlashChecksum Commands)
- Verify Checksum value
- Update data Buffer with my proper value
- Write Data memory Block (using DataFlashClas, DataFlashBlock, DataFlashData and DataFlashChecksum Commands)
- Seal Data Flash memory and Verify Control status register
- Soft reset the BQ.
To verify that parameters are correctly stored into my BQ, I read only data memory flash (in Unseal access Mode) and It was equal to what I wrote.
Then, When acquiring BQ data, such as Remaining Capacity (command 0x10) or Full Charge Capacity (command 0x12 ),some acquired data are wrong, like :
RAAC(0 mAh) , VOLT(4116 mV), RARC(0 %), TEMP(26.1 *C) , AS(0 %), FULL, (0 mAh), IAVG(-45 mA)
Note that, after modification registers, when reading the control status registers, all these bits are set to '1': [QEN], [RUP_DIS] and [LDMD]
After that, I modified my defines declared above in order to reset the default configuration as described in the User manual, and the problem still persist!
Finally, I compared the whole data block that I modified (Subclass ID 48, 82, 80, 34, 02) in two different BQs, the first with modified parameters and the second without any block modification, and data blocks are not similar ! there are another fields that are not the same, and not modified using my code source.
Note that I Have to update these parameters using STM32 through I2C and not using BqStudio.
So, My questions are:
- Apart from steps that I described previously, Is there a missing step for writing data flash?
- Is it normal that I found some Data Block fields changed that I didn't set ?
- Is these dependencies between parameters that I have to Set? Did I miss some parameter that I have to update ?
Best Regards,
Ghada,
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BQ24250: VINDPM operation of BQ24250
Part Number:BQ24250
Hello Jeff
Thanks for the reply. I have 2 questions
1) For BQ24250 if I want use it USB connector charger only. Then only VBUS and GND pins are connected and D+,D- will not be used on USB input connector.
Basically is configuration for charger without enumeration.
In such case if I limit=1.5Amp and I charge= 1Amp and this this IC in batterypack is connected to PC with 500 mA current, then within how much time charge current will get settled to 500 mA? Since PC can source only 500 mA current, input voltage will decrease and VINDPM mode will get activated. So charge current will get set to 500 mA automatically. This action will take place in how much millisecond time? Will it cause any load on PC USB connector?
2) In above mode, is there any feedback on I2C lines that VINDPM mode is in operation?
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CSD86311W1723: in Bidirectional Power Switch design
Part Number:CSD86311W1723
The question is about using CSD86311W1723 in a Bidirectional Power Switch as in "Figure 7. BPS Configuration – Back-to-Back Connected N-MOSFETs in Common-Source Configuration" of TI Appnote slva948.pdf for Vin in the range of 1.8V to 3.8V and small current in the range of 100nA to 15mA.
This power switch is used in a test board to switch on and off the power to the test circuit. It seems that this Dual N-Channel Power MOSFET CSD86311W1723 was damaged sometimes. The question is whether this could be caused by 1) possible short-circuit/startup inrush current resulted in thermal protection problem, 2) ESD, or something else.
Any suggestion to the reason of the damage?
.
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BQ27220EVM-744: Unable to use GDK with BQ27220
Part Number:BQ27220EVM-744
Hello,
I have been trying to setup GDK for BQ2720 EVM, But facing some trouble. I was able to set up and do a discharge test. But not able to do a charge step.
Is there a document that i can refer which outlines the next steps to start the automated learning cycle using GDK?
Attached a video to show the behavior when I click Charge button.
(Please visit the site to view this video)
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LM5122: absolute maximum rating
Part Number:LM5122
Hi Team,
may i have your help to know that is there defined the time spec for SW to GND and Ho-SW and Lo-GND?
i've checked the article below but it doesn't show the answer there.
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BQ51021: Migration from BQ51013B to BQ51021
Part Number:BQ51021
I am migrating a design from BQ51013B to BQ51021 because I want to enable I2C and custom packets. I am testing now and I get 5V and then after a couple seconds the circuit shuts off. Reading through the data sheet I think it is because I have a 10k resistor pull down on TS/CTRL which makes the receiver think I am in over temperature. You can see this is just a copy from the previous BQ51013B design. We don't have support for a temperature sensor in this system so can the TS/CTRL pin just be left floating? If not should I have a voltage divider from vtsb to ts/ctrl to gnd that keeps ts/ctrl at ~1V so it doesn't trip EPT or over temperature?
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BQ78PL116: bqWizard request
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BQ34Z100-G1: bq34z100-G1 question: should RUP_DIS be clear after applying a golden image?
Part Number:BQ34Z100-G1
I am using a bq34z100-G1 and I created a “golden image” / configuration for my battery that I load into the gas gauge. After I load my configuration / golden image I can confirm it starts out with the impedance track disabled.
What I do is the following:
Step 1) flast the firmware in the bq34z100-G1
Step 2) now load my settings into the bq34z100-G1 .
Step 3) verify RUP_DIS=0 and VOK=0
I am following the flowchart on page 54 of the Ref guide linked here after I configure the bq34z100-G1 for my battery by applying the golden image to the bq34z100-G1:
http://www.ti.com/lit/ug/sluubw5/sluubw5.pdf
The first part of the flowchart shows I should start out with the gas gauge showing RUP_DIS=0 but my device starts out with RUP_DIS=1. I can confirm that VOK=0.
What settings should I check as to why after I first apply my settings / golden image I would start out with RUP_DIS set to “1” and not "0"?
Thanks,
Doug
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BQ34Z100-G1: bq34z100-G1 documentation question
Part Number:BQ34Z100-G1
Other than the bq34z100-G1 Technical Reference
http://www.ti.com/lit/ug/sluubw5/sluubw5.pdf
and the datasheet SLUSBZ5B
http://www.ti.com/lit/ds/symlink/bq34z100-g1.pdf
Is there any more documentation that has better descriptions of the settings used to configure the device? For example, if I wanted to know more about the “taper current” Subclass 36 and offset 0. There are many parameters in the device I would like to better understand to create a golden image for the battery I am using. The taper current was just an example.
Thanks,
Doug
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