RT8167B datasheet(12/38 Pages) RICHTEK

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RT8167B

DS8167B-00

October 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin Name

Pin Function

BOOT1

CPU VR Bootstrap Power Pin. This pin powers the high side MOSFET drivers.

Connect this pin to the PHASE1 pin with a bootstrap capacitor.

TONSET

Single-Phase CPU VR On-Time Setting Pin. Connect this pin to VIN with a

resistor to set ripple size in PWM mode.

ISEN1P

Positive Current Sense Input Pin of CPU VR.

ISEN1N

Negative Current Sense Input Pin of CPU VR.

COMP

CPU VR Compensation Pin. This pin is the output of the error amplifier.

CPU VR Feedback Pin. This pin is the inverting input node of the error amplifier.

RGND

Return Ground for CPU VR. This pin is the inverting input node for differential

remote voltage sensing.

GFXPS2

Set Pin for GPU VR Operation Mode. Logic-high on this pin will force the GPU VR

to enter DCM.

VCC

Controller Power Supply Pin. Connect this pin to GND via a ceramic capacitor

larger than 1

μF.

SETINIA

ADC Input for Single-Phase GPU VR VBOOT Voltage Setting.

SETINI

ADC Input for Single-Phase CPU VR VBOOT Voltage Setting.

TMPMAX

ADC Input for Single-Phase CPU VR Maximum Temperature Setting.

ICCMAX

ADC Input for Single-Phase CPU VR Maximum Current Setting.

ICCMAXA

ADC Input for Single-Phase GPU VR Maximum Current Setting.

TSEN

Thermal Monitor Sense Input Pin for CPU VR.

OCSET

Set Pin for Single-Phase CPU VR Over Current Protection Threshold.

Connect a resistive voltage divider from VCC to ground, and connect the joint of

the voltage divider to the OCSET pin. The voltage, VOCSET, at this pin sets the

over current threshold, ILIMIT, for CPU VR.

TSENA

Thermal Monitor Sense Input for GPU VR.

OCSETA

Set Pin for Single-Phase GPU VR Over Current Protection Threshold.

Connect a resistive voltage divider from VCC to ground, and connect the joint of

the voltage divider to the OCSETA pin. The voltage, VOCSETA, at this pin sets the

over current threshold, ILIMIT, for GPU VR.

IBIAS

Internal Bias Current Setting. Connect a 53.6k

Ω resistor from this pin to GND to

set the internal bias current.

VRHOT

Thermal Monitor Output Pin (active low).

VR_READY

CPU VR Voltage Ready Indicator. This pin has an open drain output.

VRA_READY

GPU VR Voltage Ready Indicator. This pin has an open drain output.

ALERT

Alert Line of SVID Interface (active low). This pin has an open drain output.

VDIO

Data Transmission Line of SVID Interface.

VCLK

Clock Signal Line of SVID Interface.

RGNDA

Return Ground for Single-Phase GPU VR.

This pin is the inverting input node for differential remote voltage sensing.

FBA

GPU VR Feedback Pin. This pin is the inverting input node of the error amplifier.

COMPA

Single-Phase GPU VR Compensation Pin. This pin is the output of the error

amplifier.

ISENAN

Negative Current Sense Input Pin of Single-Phase GPU VR.

ISENAP

Positive Current Sense Input Pin of Single-Phase GPU VR.

TONSETA

Single-Phase GPU VR On-Time Setting Pin. Connect this pin to VIN with a

resistor to set ripple size in PWM mode.

To be continued

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