PM6685 datasheet(2/52 Pages) STMICROELECTRONICS

Part #	PM6685

Description	Dual step-down main supply controller with auxilary voltages for notebook system power

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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2 / 52 page

Contents

PM6685

2/52

Contents

1

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2

Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2

Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3

Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1

Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5

Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6

Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7

Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.1

Constant on time PWM control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.2

Constant on time architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.3

Output ripple compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.4

Pulse skip mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.5

No-audible skip mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.6

Current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.7

Soft start and soft end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.8

Gate drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.9

Reference voltage and bandgap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.10

Internal linear regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.11

Power up sequencing and operative modes . . . . . . . . . . . . . . . . . . . . . . . 30

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