LP2951-Q1: detail information of IFB and Vref

Chang-Yi Cheng

Prodigy 80 points

Part Number: LP2951-Q1

Tool/software:

Could you help me provide the information about the Maximum V_ref,Minimum V_ref, Maximum I_fband Minimum I_fb?

LP2951-Q1 Automotive, Adjustable Micropower Voltage Regulators With Shutdown datasheet (Rev. G)(PAGE 15)

Asker Cheng

8 months ago

+1 Rohit Phogat1 8 months ago

TI__Intellectual 2250 points

Hey Asker,

The variation of the Vref is captured in the EC table section of the datasheet:

The variation of the IFB is not characterized across multiple devices (to capture process variation), but there is plot in datasheet that captures the variation of the IFB with temperature:

Yet, I want to highlight that, as mentioned in section 6.3.2, if the divider current is increased to approx. 12uA (FB divider bottom resistance at 100kohm), the error in the output due to FEEDBACK bias current can be reduced to 0.17%.

Regards,
Rohit Phogat

0 Chang-Yi Cheng 7 months ago in reply to Rohit Phogat1

Prodigy 80 points

so I also can use the value of table and curve to calculate output voltage of equation (1)

+1 Rohit Phogat1 7 months ago in reply to Chang-Yi Cheng

TI__Intellectual 2250 points

Yes, Asker.

You can use that.

Regards,
Rohit

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LP2951-Q1: detail information of IFB and Vref