L6986H datasheet(63/68 Pages) STMICROELECTRONICS

63 / 68 page

Contents

Application schematic .............................................................2

Pin settings........................................................................3

2.1

Pin connection ................................................................. 3

2.2

Pin description ................................................................. 3

2.3

Maximum ratings ............................................................... 4

2.4

Thermal data .................................................................. 5

2.5

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

Electrical characteristics...........................................................6

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

4.1

Power supply and voltage reference.............................................. 12

4.2

Voltage monitor ............................................................... 12

4.3

Soft-start and inhibit ........................................................... 12

4.3.1

Ratiometric startup ...................................................... 17

4.3.2

Output voltage sequencing ................................................ 18

4.4

Error amplifier ................................................................ 18

4.5

Output voltage line regulation ................................................... 18

4.6

Output voltage load regulation................................................... 19

4.7

High-side switch resistance vs. input voltage ...................................... 19

4.8

Light-load operation ........................................................... 20

4.8.1

Low noise mode (LNM) ................................................... 20

4.8.2

Low consumption mode (LCM) ............................................. 21

4.8.3

Quiescent current in LCM with switchover..................................... 27

4.9

Switchover feature ............................................................ 29

4.9.1

LCM ................................................................. 29

4.9.2

LNM ................................................................. 29

4.10

Overcurrent protection ......................................................... 29

4.11

OCP and switchover feature .................................................... 31

4.12

Overvoltage protection ......................................................... 33

4.13

Thermal shutdown............................................................. 34

L6986H

Contents

DS12905 - Rev 2

page 63/68

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