STUSB4700 datasheet(21/32 Pages) STMICROELECTRONICS

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STUSB4700

Typical use cases

DocID030193 Rev 2

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Typical use cases

7.1

Power supply

– buck topology

Figure 6: Power supply - buck topology

The STUSB4700 offers the possibility to have up to 5 PDOs using (GPIO0 to GPIO3).

For example PDO1:5V 3A (no GPIO grounded), PDO2:9V 3A (GPIO0 to GND), PDO3:15V

3A (GPIO1 to GND).

Depending on the contract negotiated between source and sink VBUS voltage can go up to

20 V.

VBUS = Vref x (1+ R1p / (R1+R2+R3+R4+R5))

Table 16: Resistor value

PDO

VOUT

Computation

Resistor value (ohm)

–

R1P

200 k

��1 =

��1��∙1.24

��−1.24

13 k

��2 =

��1��∙1.24

��−1.24

− ��1

9.53 k

��3 =

��1��∙1.24

��−1.24

− ��1 − ��2

41.2 k

��4 =

��1��∙1.24

��−1.24

− ��1 − ��2 − ��3

9.53 k

��5 =

��1��∙1.24

��−1.24

− ��1 − ��2 − ��3 − ��4

41.2 k

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