AS1361-BTTT-25 データシートの表示（PDF） - austriamicrosystems AG

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AS1361-BTTT-25

150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators, with POK

austriamicrosystems AG 

AS1361/AS1362

Datasheet - Detailed Description

The maximum power dissipation is calculated:

PDMAX = (TJ - TAMB)/(θJC + θCA)

Where:

TJ - TAMB is the temperature difference between the AS1361/AS1362 die junction and the surrounding air;

θJC is the thermal resistance of the package;

θCA is the thermal resistance through the PC board/copper traces/other materials to the surrounding air.

(EQ 2)

Note: Pin GND of the AS1361/AS1362 provides the electrical connection to system ground and also serves as a heat

sink. Connect pin GND to the system ground using a large pad or ground plane.

Noise Reduction

The AS1361/AS1362 noise bypass circuitry dramatically reduces output noise, exhibiting 9µVRMS of output voltage

noise with CBYPASS = 0.01µF and COUT = 1µF. Use an external 0.01µF bypass capacitor between pin BYPASS and pin

OUT (see Figure 1 on page 1).

Note: Startup time is minimized by internal power-on circuitry which pre-charges CBYPASS.

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Revision 1.03

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