2

DS8207P-03

September 2016

www.richtek.com

RT8207P

©

Copyright 2016 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Pin Configuration

(TOP VIEW)

WQFN-20L 3x3

VTTREF

GND

VTTGND

VTTSNS

LGATE

PGND

VDDP

CS

15

14

13

12

17

18

19

20

1

2

3

4

9

8

7

6

GND

21

11

5

16

VDDQ

VDD

10

Marking Information

4B=YM

DNN

4B= : Product Code

YMDNN : Date Code

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

VTTGND

Power ground output for VTT LDO.

2

VTTSNS

Voltage sense input for VTT LDO. Connect to the terminal of the VTT LDO

output capacitor.

3,

21 (Exposed Pad)

GND

Analog ground. The exposed pad must be soldered to a large PCB and

connected to GND for maximum thermal dissipation.

4

VTTREF

Buffered reference output.

5

VDDQ

Reference input for VTT and VTTREF. Discharge current sinking terminal for

VDDQ non-tracking discharge. Output voltage feedback input for VDDQ output

if the FB pin is connected to VDD or GND.

6

FB

VDDQ output setting. Connect to GND for DDR3 (VVDDQ = 1.5V) power supply.

Connect to VDD for DDR2 (VVDDQ = 1.8V) power supply. Or connect to a

resistive voltage divider from VDDQ to GND to adjust the output of PWM from

0.75V to 3.3V.

7

S3

S3 signal input.

8

S5

S5 signal input

9

TON

Set the UGATE on time through a pull-up resistor connecting to VIN.

10

PGOOD

Power good open drain output. In High state when VDDQ output voltage is

within the target range.

11

VDD

Supply input for analog supply.

12

VDDP

Supply input for LGATE gate driver.

13

CS

Current limit threshold setting input. Connect to VDD through the voltage setting

resistor.

14

PGND

Power ground for low side MOSFET.

15

LGATE

Low side gate driver output for VDDQ.

16

PHASE

Switch node. External inductor connection for VDDQ and behave as the current

sense comparator input for Low Side MOSFET RDS(ON) sensing.

17

UGATE

High side gate driver output for VDDQ.

18

BOOT

Boost flying capacitor connection for VDDQ.

19

VLDOIN

Power supply for VTT LDO.

20

VTT

Power output for VTT LDO.