RT8152C/D

3

DS8152C/D-04

April 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

NTC

Thermal Detection Input for VRTT Circuit. Connect this pin with a resistor divider

from VCC using NTC on the top to set the thermal management threshold level.

2

OCSET

Over Current Protection Setting. Connect a resistor voltage divider from VCC to

ground, the joint of the resistor divider is connected to OCSET pin, with a voltage

3

DPRSLPVR

Deeper Sleep Mode Signal.

4

VRON

Voltage Regulator Enabler.

5

PGOOD

Power Good Indicator.

6

CLKEN

Inverted Clock Enable. Pull high by a resistor for CPU core application. This

open-drain pin is an output indicating the start of the PLL locking of the clock chip.

Connect to GND for Render application.

7

VCC

Chip Power.

8

SOFT

Soft-Start. This pin provides soft-start function and slew rate controller. The

capacitance of the slew rate control capacitor is restricted to be larger than 10nF.

The feedback voltage of the converter follows the ramping voltage on the SOFT

pin during soft-start and other voltage transitions according to different mode of

operation and VID change.

9

RGND

Return Ground. This pin is the negative node of the differential remote voltage

sensing.

To be continued

Figure 2. Render Core Voltage Regulator

VID0

VID1

VID2

VID3

VID4

5V

29

23

22

20

27

28

21

15

5

2

VID0

VID1

VID2

VID3

UGATE

ISEN_N

RT8152C/D

VID4

LGATE

PGND

31

30

PVDD

24

17

VCC

RGND

BOOT

PGOOD

7

PHASE

OCSET

ISEN

16

R11

PWRGD

3.3V

L1

C5

R7

C7

C1

R1

C4

Q1

Q2

R4

R5

R8

5V to 25V

R6

C6

D1

CMSET

11

12

COMP

14

VSEN

R18

R19

C13

C12

R20

NTC1

C10

SOFT 8

9

R17

R16

R15

NTC2

R22

DPRSLPVR

3 DPRSLPVR

GND

18, 33 (Exposed Pad)

C9

19

C2

C3

TON

R2

R3

VID5

VID6

25

26

VID5

VID6

R21

R13

13

FB

CM

R12

C11

CM 10

CLKEN

VRTT

6

32

R9

VRTT

R14

1

NTC

VRON

4 VRON