RT8167A datasheet(4/40 Pages) RICHTEK

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RT8167A

DS8167A-00

January 2012

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Pin No.

Pin Name

Pin Function

RGNDA

Return Ground for GFX VR. This pin is the negative input for differential

remote voltage sensing.

FBA

GFX VR Feedback. This is the negative input node of the error amplifier.

COMPA

GFX VR Compensation. This pin is the output node of the error amplifier.

ISENAN

Negative Current Sense Input of GFX VR.

ISENAP

Positive Current Sense Input of GFX VR.

TONSETA

On-Time Setting of GFX VR. Connect this pin to VIN with one resistor.

Chip Enable (Active High).

BOOTA

Bootstrap Flying Capacitor Connection for GFX VR. This pin powers the high

side MOSFET drivers. Connect this pin to PHASEA with an external ceramic

capacitor.

UGATEA

High Side MOSFET Floating Gate Driver Output for GFX VR. Connect this

pin to the gate of high side MOSFET.

PHASEA

Switching Node Connection for GFX VR. PHASEA is also the zero cross

detect input for GFX VR. Connect this pin to the high side MOSFET sources

together with the low side MOSFET drains and the inductor.

LGATEA

Synchronous-Rectifier Gate Driver Output of GFX VR. Connect this pin to the

gate of low side MOSFET.

PVCC

5V Power Supply of Driver. Bypass this pin to GND with a 1

μF or greater

ceramic capacitor.

LGATE

Synchronous-Rectifier Gate Driver Output of CORE VR. Connect this pin to

the gate of low side MOSFET.

PHASE

Switching Node Connection for CORE VR. PHASE is the internal lower

supply rail for the UGATE. PHASE is also the zero cross detect input for

CORE VR. Connect this pin to the high side MOSFET sources together with

the low side MOSFET drains and the inductor.

UGATE

High Side MOSFET Floating Gate Driver Output for CORE VR. Connect this

pin to the gate of high side MOSFET.

BOOT

Bootstrap Flying Capacitor Connection for CORE VR. This pin powers the

high side MOSFET drivers. Connect this pin to PHASE with an external

ceramic capacitor.

TONSET

On-Time Setting of CORE VR. Connect this pin to VIN with one resistor.

49 (Exposed pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected to

GND for maximum power dissipation.

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