L6983 datasheet(58/63 Pages) STMICROELECTRONICS

58 / 63 page

Contents

Diagram ...........................................................................3

Pin configuration ..................................................................4

Typical application circuit..........................................................6

Absolute maximum ratings ........................................................7

4.1

ESD protection ................................................................ 7

4.2

Thermal characteristics ......................................................... 7

Electrical characteristics...........................................................8

5.1

Frequency selection table ...................................................... 10

Functional description ............................................................11

6.1

Enable ...................................................................... 11

6.2

Soft-start..................................................................... 12

6.3

Undervoltage lockout .......................................................... 13

6.4

Light-load operation ........................................................... 13

6.4.1

Low consumption mode (LCM) ............................................. 14

6.4.2

Low noise mode (LNM) ................................................... 18

6.4.3

Efficiency for low consumption mode and low noise mode part number .............. 19

6.4.4

Load regulation for low consumption mode and Low noise mode part number ......... 20

6.5

Switch-over feature ............................................................ 21

6.6

Spread spectrum .............................................................. 21

6.7

Overvoltage protection ......................................................... 21

6.8

Overcurrent protection ......................................................... 21

6.9

Thermal shutdown............................................................. 24

6.10

Power Good.................................................................. 24

Closing the loop ..................................................................26

7.1

GCO(s) control to output transfer function ......................................... 26

7.2

Error amplifier compensation network ............................................ 27

7.3

Voltage divider ................................................................ 28

Application notes .................................................................29

8.1

Programmable power up threshold ............................................... 29

L6983

Contents

DS13116 - Rev 1

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