RT4841

3

DS4841-00 May 2021

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Copyright

2021 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1, 2, 20

GND

Ground pin.

3, 7

NC

Not connected. Should be floating or connected to GND.

4, 5

SWO

Boost regulator external p-channel pass switch out.

6

FB

Feedback of SWO. Connect to the center of resistor voltage divider to program

the output voltage.

8

SWG

Boost regulator external p-channel pass switch gate input.

9, 10

SWI

Output voltage of step-up converter.

11, 12

PGND

Power ground.

13

SW

Switch node of Boost.

14

BT

Power supply for high-side MOSFET gate driver. A ceramic capacitor of 0.1

F

must be connected between this pin and the SW pin.

15

VIN

Power supply input.

16

COMP

Compensation pin for error amplifier. Connect a series RC from COMP to

ground.

17

SS

Soft-start control. Connect a soft-start capacitor (CSS) to this pin. The soft-start

capacitor is charged with a constant current of 5

A. The soft-start capacitor is

discharged to ground when EN is low.

18

VL

Internal 5V linear regulator output.

19

EN

Chip enable control pin. Pull EN pin high and to turn on these channels. A 1M



pull down resistor is connected from this pin to ground.

21 (Exposed Pad)

PGND

Power ground. The Exposed Pad should be soldered to a large PCB and

connected to PGND for maximum thermal dissipation.