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RT8859M

Multi-Phase PWM Controller for CPU Core Power Supply

Richtek Technology 

RT8859M

Functional Pin Description

Pin No.

Pin Name

Pin Function

4, 1, 5, 8 ISEN [1:4] P Positive Current Sense Pin of Phase 1, 2, 3 and 4.

3, 2, 6, 7 ISEN [1:4] N Negative Current Sense Pin of Phase 1, 2, 3 and 4.

9

RSET

Multi-Phase CORE VR Ramp Setting. This is used to set the multi-phase

CORE VR loop external ramp slope.

10

COMP

Multi-Phase CORE VR Compensation. This pin is the output node of the error

amplifier.

11

FB

Multi-Phase CORE VR Feedback. This is the negative input node of the error

amplifier.

12

RGND

Return Ground for Multi-Phase CORE VR. This pin is the negative node of the

differential remote voltage sensing.

13

DVID

Connect a resistor and a capacitor from this pin to GND to improve DVID

performance. Short this pin to GND if this function is not needed.

14

OFS

Output Voltage Offset Setting.

15

IMON

Current Monitor Output. This pin outputs a voltage proportional to the output

current.

Current Monitor Output Gain External Setting. Connect this pin with one resistor

16

IMONFB

to CPU VCC_SENSE, while the IMON pin is connected to ground with another

resistor. The current monitor output gain can be set by the ratio of these two

resistors.

17

ADD

VR Address Setting Pin.

18

VCLK

Synchronous Clock from CPU.

19

VDIO

Controller and CPU Data Transmission Interface.

20

ALERT

SVID Alert Pin (Active Low).

21

IBIAS

Internal Bias Current Setting. Connect this pin to GND via a resistor to set the

internal current.

22

SETINI

CORE VR VINITIAL Setting.

23

SETINIA

AXG VR VINITIALA Setting.

24

TMPMAX

ADC Input for Multi-Phase CORE VR Maximum Temperature Setting. This pin

is also used for AXG VR’s offset selection.

25

ICCMAX

ADC Input for Multi-Phase CORE VR Maximum Current Setting. This pin is also

used for CORE VR’s offset selection.

26

ICCMAXA ADC Input for Single-Phase AXG VR Maximum Current Setting.

Single-Phase AXG VR Current Monitor Output Gain External Setting. Connect

27

IMONFBA

this pin with one resistor to AXG rail VCCAXG_SENSE, while IMONA pin is

connected to ground with another resistor. The current monitor output gain can

be set by the ratio of these two resistors.

28

IMONA

Single-Phase AXG VR Current Monitor Output. This pin outputs a voltage

proportional to the output current.

29

SR_ADDF

Address Flip and DVID Slew Rate Setting. Set the pin to GND if fast slew rate=

10mV/μs and slow slew rate = 2.5mV/μs is used.

30

OFSA

AXG VR Output Voltage Offset Setting.

31

RGNDA

Return Ground for Single-Phase AXG VR. This pin is the negative node of the

differential remote voltage sensing.

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

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is a registered trademark of Richtek Technology Corporation.

DS8859M-05 July 2012

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