6

DS9971-01 April 2011

www.richtek.com

RT9971

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

PVDD1

Power Output of CH1.

2

LX6

Switch Node of CH6. High impedance in shutdown mode.

3

PVDD6

Power Input of CH6.

4

CP

Charge Pump External Driver.

5

CN

Charge Pump External Driver.

6

PNEG

Negative Output of Charge Pump.

7

FB6

Feedback Input of CH6. High impedance in shutdown mode.

8

FB4

Feedback Input of CH4. High impedance in shutdown mode.

9

EN6

Enable Control Input of CH6.

10

LX4

Switch Node of CH4. High impedance in shutdown mode.

11

PVDD4

Power Input of CH4.

12

EN5

Enable Control Input of CH5.

13

SW5O

Output of CH5 Load Disconnect.

14

SW5I

Input of CH5 Load Disconnect.

15

FB5

Feedback Input of CH5. High impedance in shutdown mode.

16

VREF

1.25V Reference Output.

17

SEL

Li-ion or 2AA Select. Logic state can not be changed during operation.

18

RTC_R

RTC_Reset Output.

19

RTC_PWR

Power Input of RTC_Reset.

20

PVDD3

Power Input of CH3.

21

LX3

Switch Node of CH3. High impedance in shutdown mode.

22

EN7

Enable Control Input of CH7.

23

FB3

Feedback Input of CH3. High impedance in shutdown mode.

24

VOUT7

Sense Input for CH7 Output Voltage.

25

LX5

Switch Node of CH5. High impedance in shutdown mode.

26

LX7

Switch Node of CH7. High impedance in shutdown mode.

27,

41 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected to

GND for maximum thermal dissipation.

28

CFB7

Feedback Input of CH7.

29

VDDM

IC Analog Power Input.

30

PVDD2

Power Input of CH2 step-down converter, or power output of CH2 step-up

converter.

31

LX2

Switch Node of CH2. High impedance in shutdown mode.

32

EN134

Enable Control Input of CH1, CH3 and CH4.

33

COMP2

Compensation of CH2. Pull to GND in shutdown mode.

34

FB2

Feedback input of CH2. High impedance in shutdown mode.

35

VOUT1

CN is set to low or floating : Sense Pin for CH1 Output Voltage. High impedance

in shutdown. CN is set to High: Output pin of RTC_LDO.

36

OK

CN is set to low or floating : External Switch Control. High impedance in

shutdown. CN is set to High : Power input pin of RTC_LDO.

37

FB1

Feedback Input of CH1. High impedance in shutdown mode.

38

COMP1

Compensation of CH1. Pull to GND in shutdown mode.

39

EN2

Enable Control Input of CH2.

40

LX1

Switch Node of CH1. High impedance in shutdown mode.