TPS7A84: TPS7A84 open/short test result

Hirotsugu Kobayashi

Part Number: TPS7A84

Hi, all.

Do you have any result of terminal open/short test for TPS7A84?

The terminal open/short test is for checking whether the device causes any serious problem (Catching fire or smoke) or not when the device any pin is opened or short between any two adjacent pins.

Best Regards,

Kobayashi

over 7 years ago

0 Ryan Eslinger over 7 years ago

TI__Guru 55940 points

Hi Kobayashi,

We are looking into this and will respond in a day or two.

Very Respectfully,
Ryan

0 Ryan Eslinger over 7 years ago in reply to Ryan Eslinger

TI__Guru 55940 points

Hi Kobayashi,

Below please find the worst case conditions for floating or shorting a pin to an adjacent pin.

	Float
50mV	Pin Name Voltage not added to Vout
100mV	Pin Name Voltage not added to Vout
200mV	Pin Name Voltage not added to Vout
400mV	Pin Name Voltage not added to Vout
800mV	Pin Name Voltage not added to Vout
1.6V	Pin Name Voltage not added to Vout
BIAS	If Vin is less than 2.2V decreased performance or dropout, if Vin is greater than 2.2V no adverse effect
EN	The LDO may or may not be enabled. This pin should be driven at all times.
FB	Dropout
GND	This is the reference for all internal voltages. If floating, Vout will vary between GND and IN
IN	There will be no output voltage
NR/SS	No adverse effect
OUT	There will be no output voltage seen by the system
PG	There will be no PG signal seen by the system
SNS	If ANYOUT feature is used dropout, if ANYOUT feature is not used no adverse effect

	Short to adjacent pins
50mV	Pin Name Voltage added, subtracted or no adverse effect depending on state of pin shorted to
100mV	Pin Name Voltage added, subtracted or no adverse effect depending on state of pin shorted to
200mV	Pin Name Voltage added, subtracted or no adverse effect depending on state of pin shorted to
400mV	Pin Name Voltage added, subtracted or no adverse effect depending on state of pin shorted to
800mV	Pin Name Voltage added, subtracted or no adverse effect depending on state of pin shorted to
1.6V	Pin Name Voltage added, subtracted or no adverse effect depending on state of pin shorted to
BIAS	Damage LDO if BIAS is above Abs Max of shorted pin
EN	LDO enabled if shorted to Vin. LDO disabled if shorted to NR/SS
FB	Dropout if shorted to PG, no adverse effect if shorted to SNS
GND	Current limit and thermal shutdown if shorted to OUT, ANYOUT pin name added to output voltage if shorted to 200mV or 400mV, no output if shorted to IN
IN	No output if shorted to GND, no adverse effect if shorted to EN
NR/SS	Damage LDO if BIAS is above Abs Max
OUT	Current limit and thermal shutdown if shorted to GND, no adverse effect if shorted to SNS
PG	Dropout
SNS	No adverse effect

Very Respectfully,

Ryan

0 Hirotsugu Kobayashi over 7 years ago in reply to Ryan Eslinger

Mastermind 8485 points

Hello Ryan,

Apologies for the delayed response.
Do you have any data pin to GND short test result?

Best Regards,
Kobayashi

0 Ryan Eslinger over 7 years ago in reply to Hirotsugu Kobayashi

TI__Guru 55940 points

Hi Kobayashi,

By "data pin" do you mean the ANYOUT pins (50mV, 100mV, etc)? If these pins are shorted to GND, the pin name is added to the reference voltage (0.8V) as described in section 8.1.7 of the datasheet.

Very Respectfully,

Ryan

0 Hirotsugu Kobayashi over 7 years ago in reply to Ryan Eslinger

Mastermind 8485 points

Hi Ryan,
I'm sorry that my sentences are strange.
I want to know FMEA of TPS7A84.
Please tell me each Pin short-circuited to Ground.

Best Regards,
Kobayashi

0 JCHK over 7 years ago in reply to Hirotsugu Kobayashi

TI__Mastermind 43630 points

HI Kobayashi-san,

Ryan's answers were correct with respect to the Any-Out(TM) pins. If all of this pins are shorted to GND, VOUT is 3.95V. Whatever pins are shorted, add to the reference voltage of 0.8V. As for the other pins, Ryan has already disclosed what happens when they are shorted to GND.

I think maybe we are not understanding your question clearly. If you needed, I can be available tomorrow afternoon (Japan Time) to discuss.

Please let me know if this helps your understanding.

Thank you,

Power management

Power management forum

TPS7A84: TPS7A84 open/short test result