MCT8316Z datasheet(32/104 Pages) TI

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8.3.5 AVDD Linear Voltage Regulator

A 3.3-V, linear regulator is integrated into the MCT8316Z family of devices and is available for use by external

circuitry. The AVDD regulator is used for powering up the internal digital circuitry of the device and additionally,

this regulator can also provide the supply voltage for a low-power MCU or other circuitry supporting low current

(up to 30 mA). The output of the AVDD regulator should be bypassed near the AVDD pin with a X5R or X7R,

1-µF, 6.3-V ceramic capacitor routed directly back to the adjacent AGND ground pin.

The AVDD nominal, no-load output voltage is 3.3V.

AVDD

AGND

CAVDD

External Load

REF

–

VBK

BUCK_PS_DIS

FB_BK

Figure 8-14. AVDD Linear Regulator Block Diagram

Use Equation 1 to calculate the power dissipated in the device by the AVDD linear regulator with VM as supply

(BUCK_PD_DIS = 1)

= (88/ F 8#8&& ) × +#8&&

(1)

For example, at a VVM of 24 V, drawing 20 mA out of AVDD results in a power dissipation as shown in Equation

24 V

3.3 V

20 mA

414 mW

(2)

Use Equation 3 to calculate the power dissipated in the device by the AVDD linear regulator with buck output as

supply (BUCK_PD_DIS = 0)

P= VFB_BK−VAVDD ×IAVDD

(3)

MCT8316Z

SLVSF18B – MARCH 2021 – REVISED NOVEMBER 2021

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MCT8316Z Datasheet(PDF) 32 Page - Texas Instruments