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LM27762: LM27762

Jan Volkering
Expert 8190 points

Part Number: LM27762

In order to get +/-5V out , what positive input voltage should be minimally applied? is that 5.5V?

Since the voltage drop is less than 100mV I suspect you can get regulated pos/min 5V outputs already at less than 5.5Vin.

A curve of achievable output voltages versus input voltages would be helpful.

Final question.

The PSRR graph goes up to 100KHz. are there numbers of PSRR up to 1MHz?

  • 0
    TI__Guru**** 152260 points
    Hi Jan,

    This depends on how much load current is needed. Figure 3 shows the dropout voltages of the LDOs so this gives the minimum Vin for the +Vout.

    In addition to the LDO's dropout voltage, the -Vout needs additional input voltage to overcome the charge pump's output impedance, shown in Figure 4.

    There is no PSRR data for higher frequencies, but the existing figures show that 100 kHz is already above the bandwidth of the LDO. Any PSRR there is the result of component selection, PCB layout, etc.