LP8860-Q1EVM: LP8860-Q1 some question about EVM and pin define

Lawrence He

Part Number: LP8860-Q1EVM

Dear Support Team,

I have some question about LP8860-Q1 as below:

1. Pin11 (Fault pin) is normall open or normall close? if input voltage was turn off, how to know the Fault signal output? if IC error, the Fault pin is continued output signal to high?

2. If IC erro, the Fault rest is high or low? Could share IC Fault reset workflow? if IC reset, the output is off?

3. below chart show Pin17 NSS, what is mean I2C or standalone mode?

4. if VDDIO/EN input is low to 0v , the mean IC is shutdown? and IQ is mean Quiescent current?

5. we saw LP8860-Q1 EVM as below link, What is the EVM operating temperature?

https://www.mouser.com/datasheet/2/405/snvu382a-346635.pdf

if our project operating temperature is -40deg to 120deg, how to choose resistor ?

6. if we need output current is 80mA, how to select resistor value?

7. Display mode :through a user-programmable EEPROM value, if system reboot the current iset is Hardware setting or EEPROM?

8. Boost converter transistor: about peak current is mean inductor saturation current?

9. The LP8860-Q1 EVM BOM List. about Inductor Selection:

we saw the output current up to 150mA/Channel, why need L1 22uH/5.5A ? it`s mean peak current could possible over 5A?

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

over 3 years ago

0 Xiaoguang over 3 years ago

TI__Genius 17520 points

Hi, Lawrence,

Is this new project? We'd like to recommend LP8864/67/9 for new design. thanks.

Regards,

0 hao-chun hsu over 3 years ago

Prodigy 10 points

Xiaoguang said:
Hi, Lawrence,

Is this new project? We'd like to recommend LP8864/67/9 for new design. thanks.

Regards,

XG

The project is Fisker - HSD Board, so it's not a new project. The previous designer used LP8864. We chose LP8860 because this chip can receive the signal from the thermal couple and the others can't.

0 Lawrence He over 3 years ago in reply to hao-chun hsu

Genius 3105 points

Hi, Xiaoguang

This is not new project.

About question if any comment it, Please advise me.

Thanks,

Best regards,

Lawrence

0 Lawrence He over 3 years ago in reply to Xiaoguang

Genius 3105 points

Hi, Xiaoguang

About question have any update?

if any, Please advise me.

Thanks,

Best regards,

Lawrence

0 Xiaoguang over 3 years ago in reply to Lawrence He

TI__Genius 17520 points

Lawrence,

1. Normally high; VDD 3.3V is still on although input voltage isn't

2. Please refer to Figure 42. in datasheet

3. Work under I2C mode or standalone mode

4. Yes

5. Room temperature. Resistor is ok for -40-120deg C.

6. Refer to Equ.(6) in datasheet pg.41

7. EEPROM

8. No. Inductor saturation current must be much higher than peak current

9. pls refer to 9.2.1.2.1 Inductor Selection in datasheet

Regards,

0 Lawrence He over 3 years ago in reply to Xiaoguang

Genius 3105 points

Hi, XG

Thank you for reply.

as you recommend LP8864/67/9 for new design.

it`s mean LP8860-Q1 will be End of Life? due to Wafer capacity issue?

if any, Please advise me.

Thanks,

Best regards,

Lawrence

0 Xiaoguang over 3 years ago in reply to Lawrence He

TI__Genius 17520 points

Lawrence,

LP8860 is designed for a long time and LP8864/6/7/9 are next generation of it with lower price and better performance.

Regards,

Power management

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LP8860-Q1EVM: LP8860-Q1 some question about EVM and pin define