A5975D datasheet(39/50 Pages) STMICROELECTRONICS

39 / 50 page

A5975D

Application information

Doc ID 018760 Rev 1

39/50

Equation 40

Equation 41

An important point to take into account is that the ground pin of the device is connected to

the negative output voltage. Therefore, the device is subjected to a voltage equal to VIN-VO,

which must be lower than 36 V (the maximum operating input voltage).

Figure 27.

Negative buck-boost regulator

8.9

Floating boost current generator

The A5975D does not support a nominal boost conversion as this topology requires a low

side switch, however, a floating boost can be useful in applications where the load can be

floating. A typical example is a current generator for LED driving, as the LED does not

require a connection to the ground.

Figure 28.

Floating boost topology

512

----------------

0.706

LOAD

–

---------------

0.5

10.706

–

------------------------

1.7A

AM09693v1

10V

A5975D

4.7

6.8

470

ESR>35m

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