L7983 datasheet(39/43 Pages) STMICROELECTRONICS

39 / 43 page

Contents

Application schematic and block diagram ..........................................3

1.1

Application circuit .............................................................. 3

Pin settings........................................................................4

Absolute maximum ratings ........................................................5

3.1

Thermal characteristics ......................................................... 5

3.2

ESD protection ................................................................ 5

3.3

Operating conditions............................................................ 6

Electrical characteristics...........................................................7

Functional description .............................................................9

5.1

Power section ................................................................. 9

5.2

Control loop and voltage programming ............................................ 9

5.2.1

LNM/LCM selection and synchronization ..................................... 12

5.3

Switching frequency programming and dithering ................................... 15

5.4

Enable and Reset ............................................................. 17

5.5

VCC and switchover ........................................................... 19

5.6

Fault management ............................................................ 19

5.6.1

Overcurrent protection (OCP) .............................................. 20

5.6.2

Overvoltage protection (OVP) .............................................. 22

5.6.3

Overtemperature protection (OTP) .......................................... 22

5.7

Application design guidelines ................................................... 23

5.7.1

Input capacitor selection .................................................. 23

5.7.2

Inductor selection ....................................................... 23

5.7.3

Output capacitor selection................................................. 23

5.7.4

Layout considerations .................................................... 24

5.7.5

Thermal considerations................................................... 25

Evaluation board .................................................................26

6.1

Schematic and PCB layout ..................................................... 26

6.2

L7983PUR - Evaluation board ................................................... 28

6.3

L7983PU33R - Evaluation board................................................. 30

L7983

Contents

DS13354 - Rev 1

page 39/43

L7983 Datasheet(PDF) 39 Page - STMicroelectronics

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