RT9907

5

DS9907-11 May 2014

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Copyright 2014 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Pin No.

Pin Name

Pin Function

1

COMP3

CH3 Feedback Compensation Pin.

2

VDD3

CH3 Power Input Pin.

3

LX3

CH3 Switch Node. Drains of the internal P-MOSFET and N-MOSFET switches.

Connect an inductor to LX3 pins together as close as possible.

4

PGND3

Power Ground for CH3.

5

SS

Sets the Soft Start interval of the converter. Connect a capacitor from this pin to

ground.

6

RT

Frequency setting resistor connection pin. Frequency is 500kHz if RT pin not

connected

7, 23

GND

Analog Ground.

8

VDDM

Device Input Power Pin.

9

FB1

CH1 Feedback Input Pin.

10

COMP1

CH1 Feedback Compensation Pin.

11

PGND1

Power Ground for CH1

12

VDD1

CH1 Power Input Pin. Connect output of Boost to this pin.

13

LX1

CH1 Switch Node. Connect an inductor to LX1 Pins together as close as possible.

14

PGND2

Power Ground for CH2.

15

LX2

CH2 Switch Node. Drains of the internal P-Channel and N-MOSFET switches.

Connect an inductor to LX2 pins together as close as possible.

16

VDD2

CH2 Power Input Pin.

17

ENM

Whole Device Control Pin. Tie this pin higher than 1.3V to enable the device. Tie

below 0.4V to turn off the device.

18

EN1

CH1 Enable Input. Tie this pin higher than 1.3V to enable CH1. Tie below 0.4V to

turn off the CH1.

19

COMP2

CH2 Feedback Compensation Pin.

20

FB2

CH2 Feedback Input.

21

EN2

CH2 Enable Input. Tie this pin higher than 1.3V to enable CH2. Tie below 0.4V to

turn off the CH2.

22

EN3

CH3 Enable Input. Tie this pin higher than 1.3V to enable CH3. Tie below 0.4V to

turn off the CH3.

24

FB3

CH3 Feedback Input.

25 (Exposed Pad) GND

The exposed pad must be soldered to a large PCB and connected to GND for

maximum power dissipation.

Functional Pin Description