RT8803A 데이터 시트보기 (PDF) - Richtek Technology
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RT8803A Datasheet PDF : 27 Pages
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Functional Pin Description
VTT/EN (Pin 1)
The pin is defined as the chip enable, and the VTT is
applied for internal VID pull high power and power sequence
monitoring.
VR_Ready (Pin 2)
Power good open-drain output.
FBRTN (Pin 3)
Feedback return pin. VID DAC and error amplifier reference
for remote sensing of the output voltage.
FB (Pin 4)
Inverting input pin of the internal error amplifier.
COMP (Pin 5)
Output pin of the error amplifier and input pin of the PWM
comparator.
SS (Pin 6)
Connect this SS pin to GND with a capacitor to set the
soft-start time interval.
VR_FAN (Pin 7)
The pin is defined to signal VR thermal information for
external VR thermal dissipation scheme triggering.
VR_HOT (Pin 8)
The pin is defined to signal VR thermal information for
external VR thermal dissipation scheme triggering.
TSEN (Pin 9)
Temperature detect pin for VR_HOT and VR_FAN.
DVD (Pin 10)
Programmable power UVLO detection input. Trip threshold
is 1V at VDVD rising.
RT (Pin 11)
The pin is defined to set internal switching operation
frequency. Connect this pin to GND with a resistor RRT to
set the frequency FSW.
FSW
=
4.463 e9
RRT + 3500
RT8803A
OFS (Pin 12)
The pin is defined for load line offset setting.
ADJ (Pin 13)
Current sense output for active droop adjusting. Connect
a resistor from this pin to GND to set the load droop.
IMAX (Pin 14)
The pin is defined to set threshold of over current.
ISN1 (Pin 15)
Current sense negative input pin for channel 1 current
sensing.
ISN23 (Pin 16)
Current sense negative input pins for channel 2 and
channel 4 current sensing.
ISP1 (Pin 19), ISP2 (Pin 18), ISP3 (Pin 17)
Current sense positive input pins for individual converter
channel current sensing.
PWM1 (Pin 20), PWM2 (Pin 21), PWM3 (Pin 22)
PWM outputs for each driven channel. Connect these pins
to the PWM input of the MOSFET driver. For systems
which using 2/3/4 channels, pull PWM 3/4/5 pins up to
high.
VDD (Pin 23)
IC power supply. Connect this pin to a 5V supply.
VID7 (Pin 24), VID6 (Pin 25), VID5 (Pin 26), VID4 (Pin
27), VID3 (Pin 28), VID2 (Pin 29), VID1 (Pin 30),
VID0 (Pin 31), VID_SEL (32)
DAC voltage identification inputs for VRD10.x / VRD11 /
K8 / K8_M2 . These pins are internally pulled up to VTT.
VIDSEL
VTT
GND
VDD
VDD
VID [7]
X
X
NC
GND
Table
VR11
VR10.x
K8
K8_M2
GND [Exposed pad (33)]
The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
DS8803A-06 April 2011
www.richtek.com
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