TPS3801: TPS3801K33DCKR

TAlex Wu

Expert 1100 points

Part Number: TPS3801
Other Parts Discussed in Thread: TPS3103

Dear SIR: (continue before question ,because didn't reply)

Thank for your reply.

But,May I double confirming :

(1) according to your reply:

Is that meaning as below ?:

For VDD pin or PFI pin Vref is 0.551V

TPS3103K33 and TPS3103E16 's VDD pin have "internal resistor divider" therefore base on different sku.(for example: K33 ,E16 ) have different Vth.(K33 ->Vth is 2.941 ,E16 vth is 1.523)

MR# pin have internal pull up to VDD resistor.

But, PFI pin without "internal resistor divider" ,therefore PFI pin need add external resistor divider for met requirement by Vth =0.551 x (Rtop + Rbottom) / Rbottom calculator .

Therefore ,

TPS3103K33 vs MIC2774N-29:

different I: TPS3103K33 Vth = 2.941V MIC2774N-29 Vth = 2.93V

different II: TPS3103K33 Vref = 0.551V MIC2774N-29 Vref =0.3V

TPS3103E16 vs MIC2774N-17:

different I: TPS3103E16 Vth = 1.523V MIC2774N-29 Vth = 1.69V

different II: TPS3103E16 Vref = 0.551V MIC2774N-29 Vref =0.3V

different III: TPS3103 RESET internal Reset Logic Timer separate with PFI pin vs MIC2774N internal AND then delay .

[As you mention before that recommend to wire together between TPS3103 's RESET pin PFO pin by external ,But ,the behavior will the same as MIC2774N ? How ? ]

different IV: TPS3103 Delay Min= 65ms MIC2774N Delay Min= 140ms

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The TPS3103 has a 2.941V version (TPS3103K33) but does not have a 1.69V version, the closest is 1.523V (TPS3103E16) or 1.843V (TPS3103H20).

For the PFI pin, the threshold is 0.551V so you use a resistor divider with

trigger voltage = 0.551 x (Rtop + Rbottom) / Rbottom

(2) Seams [A circuit] MIC2774N psec. mention that "It will remain asserted for no less than 140ms after Vin and VDD return above the threshold limits."

But, TPS3103 spec. mention that Min :65ms Max:195ms. Is that meaning TPS3103 min: 65ms and can't replace MIC2774N Min : 140ms ?

(Or that TPS3103 min: 65 ms Max:196 ms base on different sku (for example: TPS3103K33 ,TPS3103E16 ,....) ,by different strap pin for select ,... that have different ?)

Thanks

over 5 years ago

0 Michael_DeSando over 5 years ago

TI__Genius 12630 points

The thresholds and delays vary slightly but the functionality of the devices are the same. I do not think the circuits are configured correctly for the PFI pin. Please use a resistor divider instead of a pull-up resistor only.

Please let me know if anything is unclear or if you need me to review the final schematic. Thanks!

-Michael

0 TAlex Wu over 5 years ago in reply to Michael_DeSando

Expert 1100 points

Dear SIR:

Thanks for your reply.

But you didn't reply our question directly. Would you reply our question directly ?

===================================

Dear SIR: (continue before question ,because didn't reply)

Thank for your reply.

But,May I double confirming :

(1) according to your reply:

Is that meaning as below ?:

For VDD pin or PFI pin Vref is 0.551V

TPS3103K33 and TPS3103E16 's VDD pin have "internal resistor divider" therefore base on different sku.(for example: K33 ,E16 ) have different Vth.(K33 ->Vth is 2.941 ,E16 vth is 1.523)

MR# pin have internal pull up to VDD resistor.

But, PFI pin without "internal resistor divider" ,therefore PFI pin need add external resistor divider for met requirement by Vth =0.551 x (Rtop + Rbottom) / Rbottom calculator .

Therefore ,

TPS3103K33 vs MIC2774N-29:

different I: TPS3103K33 Vth = 2.941V MIC2774N-29 Vth = 2.93V

different II: TPS3103K33 Vref = 0.551V MIC2774N-29 Vref =0.3V

TPS3103E16 vs MIC2774N-17:

different I: TPS3103E16 Vth = 1.523V MIC2774N-29 Vth = 1.69V

different II: TPS3103E16 Vref = 0.551V MIC2774N-29 Vref =0.3V

different III: TPS3103 RESET internal Reset Logic Timer separate with PFI pin vs MIC2774N internal AND then delay .

[As you mention before that recommend to wire together between TPS3103 's RESET pin PFO pin by external ,But ,the behavior will the same as MIC2774N ? How ? ]

different IV: TPS3103 Delay Min= 65ms MIC2774N Delay Min= 140ms

The TPS3103 has a 2.941V version (TPS3103K33) but does not have a 1.69V version, the closest is 1.523V (TPS3103E16) or 1.843V (TPS3103H20).

For the PFI pin, the threshold is 0.551V so you use a resistor divider with

trigger voltage = 0.551 x (Rtop + Rbottom) / Rbottom

(2) Seams [A circuit] MIC2774N psec. mention that "It will remain asserted for no less than 140ms after Vin and VDD return above the threshold limits."

But, TPS3103 spec. mention that Min :65ms Max:195ms. Is that meaning TPS3103 min: 65ms and can't replace MIC2774N Min : 140ms ?

(Or that TPS3103 min: 65 ms Max:196 ms base on different sku (for example: TPS3103K33 ,TPS3103E16 ,....) ,by different strap pin for select ,... that have different ?)

==========================================================================================

Thanks

0 TAlex Wu over 5 years ago in reply to Michael_DeSando

Expert 1100 points

Dear SIR:

Thank for your reply.

But,May I double confirming :

(1) according to your reply:

Is that meaning as below ?:

For VDD pin or PFI pin Vref is 0.551V

TPS3103K33 and TPS3103E16 's VDD pin have "internal resistor divider" therefore base on different sku.(for example: K33 ,E16 ) have different Vth.(K33 ->Vth is 2.941 ,E16 vth is 1.523)

MR# pin have internal pull up to VDD resistor.

But, PFI pin without "internal resistor divider" ,therefore PFI pin need add external resistor divider for met requirement by Vth =0.551 x (Rtop + Rbottom) / Rbottom calculator .

Therefore ,

TPS3103K33 vs MIC2774N-29:

different I: TPS3103K33 Vth = 2.941V MIC2774N-29 Vth = 2.93V

different II: TPS3103K33 Vref = 0.551V MIC2774N-29 Vref =0.3V

TPS3103E16 vs MIC2774N-17:

different I: TPS3103E16 Vth = 1.523V MIC2774N-29 Vth = 1.69V

different II: TPS3103E16 Vref = 0.551V MIC2774N-29 Vref =0.3V

different III: TPS3103 RESET internal Reset Logic Timer separate with PFI pin vs MIC2774N internal AND then delay .

[As you mention before that recommend to wire together between TPS3103 's RESET pin PFO pin by external ,But ,the behavior will the same as MIC2774N ? How ? ]

different IV: TPS3103 Delay Min= 65ms MIC2774N Delay Min= 140ms

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The TPS3103 has a 2.941V version (TPS3103K33) but does not have a 1.69V version, the closest is 1.523V (TPS3103E16) or 1.843V (TPS3103H20).

For the PFI pin, the threshold is 0.551V so you use a resistor divider with

trigger voltage = 0.551 x (Rtop + Rbottom) / Rbottom

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

(2) Seams [A circuit] MIC2774N psec. mention that "It will remain asserted for no less than 140ms after Vin and VDD return above the threshold limits."

But, TPS3103 spec. mention that Min :65ms Max:195ms. Is that meaning TPS3103 min: 65ms and can't replace MIC2774N Min : 140ms ?

(Or that TPS3103 min: 65 ms Max:196 ms base on different sku (for example: TPS3103K33 ,TPS3103E16 ,....) ,by different strap pin for select ,... that have different ?)

Thanks

Power management

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TPS3801: TPS3801K33DCKR