Operation of uA78M05-Q1 at -55degC

Shihab

Other Parts Discussed in Thread: TPS71501-EP

Hi All,

I am using uA78M05-Q1 regulator in my design for one of the aerospace application. My design specification calls for operation of

the device from -55C to 110C. As per the datasheet, operating virtual junction temperature (Tj) is -40C to 125C. Can we use the IC

for my operating temperature conditions?

Also Please let me know the impact of operating the device at -55C.

-Thanks,

Shihab

over 14 years ago

0 Ron Michallick over 14 years ago

TI__Guru**** 164456 points

Shihab,

I do not recommend this device for use at -55C, most likely issue would be start up failure. I can suggest an alternative device.

I need to know the minimum and maximum input voltage and minimum and maximum load current.

Regards,
Ron Michallick

0 Shihab over 14 years ago in reply to Ron Michallick

Expert 1205 points

Hi Ron,

Input Voltage nominal: 12V, Input Voltage Maximum: 15V

Output Voltage : 5V

Output current : 50 mA or more

Package : SMD

-Thanks,

Shihab.

0 Ron Michallick over 14 years ago in reply to Shihab

TI__Guru**** 164456 points

Shihab,

I attached all the extended temperature products for linear regulators with input voltage greater than 10V.

There is only one part that allows the full VIN; it is the TPS71501-EP (adjustable output voltage). However the maximum rated output current is 50mA.
The other parts support more current but have a VIN limit of 10V. To use these would require droping the input voltage first.

Regards,
Ron Michallick

LDO 'EP' products VIN gt 10V.xls

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Operation of uA78M05-Q1 at -55degC