PCM6340-Q1: MicBias regulator dropout/PSRR characteristic data

Shinji Tsuji

Part Number: PCM6340-Q1

Hi team,

Could you share me the characterization data of MicBias regulator in PCM6340-Q1?

Since (HVDD - MicBias) is small in my use case, I concerns how MicBias behaves If the recommended condition (HVDD>MicBias+0.6V) is violated.

I need following information under the condition below.

Condition : HVDD = 9V(typ), MicBias=8V setting, Load current = maximum 90mA,

DC-Coupled / R1=680ohm / Single end

#1.dropout performance at load current = 90mA

- HVDD vs MicBias plot (Y axis = MicBias voltage, X axis = HVDD(0V to 10V) )

- Dropout voltage(mV) vs. load current(0mA to 90mA)

#2. PSRR data (HVDD to MicBias)

regards,

over 4 years ago

0 Zak Kaye over 4 years ago

TI__Mastermind 23050 points

Hi Shinji,

The specs are provided such that there will be sufficient margin if you abide by datasheet limits. The maximum recommended output current is 80mA as the overcurrent protection may start to activate as low as 82mA. At 80mA operation with a 9V HVDD and 8V MICBIAS there will be sufficient headroom to regulate properly. I would recommend ensuring HVDD does not violate the MICBIAS +0.6V requirement so if this may happen then you will want to increase the HVDD voltage.

Best,

Zak

0 Shinji Tsuji over 4 years ago in reply to Zak Kaye

TI__Genius 14179 points

Hi Zak,

Thank you for your comment.

I would like to know if HVDD regulator works as drop out operation which means the output linearly drops according to the input voltage drops below its output regulating voltage.

Or does the output drops quickly if input voltage drops below output regulating voltage?

regards,

0 Zak Kaye over 4 years ago in reply to Shinji Tsuji

TI__Mastermind 23050 points

Hi Shinji,

Let me double check this behavior and get back to you. I should be able to provide a response tomorrow.

Best,

Zak

0 Shinji Tsuji over 4 years ago in reply to Zak Kaye

TI__Genius 14179 points

Hi Zak,

Do you have an update?

regards,

0 Zak Kaye over 4 years ago in reply to Shinji Tsuji

TI__Mastermind 23050 points

Hi Shinji,

I know this was handled directly but want to clarify for others that the device will operate in dropout if input drops below regulation point.

Best,

Zak

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PCM6340-Q1: MicBias regulator dropout/PSRR characteristic data