RT8167A View Datasheet(PDF) - Richtek Technology
Part Name
Description
Manufacturer
RT8167A Datasheet PDF : 40 Pages
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RT8167A
Pin No.
32
33
34
35
36
37
38
39
40
41
42
43
44
Pin Name
RGNDA
FBA
COMPA
ISENAN
ISENAP
TONSETA
EN
BOOTA
UGATEA
PHASEA
LGATEA
PVCC
LGATE
45
PHASE
46
UGATE
47
BOOT
48
TONSET
49 (Exposed pad) GND
Pin Function
Return Ground for GFX VR. This pin is the negative input for differential
remote voltage sensing.
GFX VR Feedback. This is the negative input node of the error amplifier.
GFX VR Compensation. This pin is the output node of the error amplifier.
Negative Current Sense Input of GFX VR.
Positive Current Sense Input of GFX VR.
On-Time Setting of GFX VR. Connect this pin to VIN with one resistor.
Chip Enable (Active High).
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.
High Side MOSFET Floating Gate Driver Output for GFX VR. Connect this
pin to the gate of high side MOSFET.
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.
Synchronous-Rectifier Gate Driver Output of GFX VR. Connect this pin to the
gate of low side MOSFET.
5V Power Supply of Driver. Bypass this pin to GND with a 1μF or greater
ceramic capacitor.
Synchronous-Rectifier Gate Driver Output of CORE VR. Connect this pin to
the gate of low side MOSFET.
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.
High Side MOSFET Floating Gate Driver Output for CORE VR. Connect this
pin to the gate of high side MOSFET.
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.
On-Time Setting of CORE VR. Connect this pin to VIN with one resistor.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
4
is a registered trademark of Richtek Technology Corporation.
DS8167A-00 January 2012
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