RT8802A
ISP1 (Pin 25), ISP2
(Pin 24), ISP3 (Pin 23),
ISP4 (Pin 22), ISP5 (Pin 21)
Current sense positive input pins for individual converter
channel current sensing.
PWM1 (Pin 26), PWM2 (Pin 27), PWM3 (Pin 28),
PWM4 (Pin 29), PWM5 (Pin 30)
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 31)
IC power supply. Connect this pin to a 5V supply.
GND [Exposed pad (41)]
The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
VIDSEL
VTT
GND
VDD
VDD
VID [7]
X
X
NC
GND
Table
VR11
VR10.x
K8
K8_M2
VID7 (Pin 32), VID6 (Pin 33), VID5 (Pin 34), VID4 (Pin
35), VID3 (Pin 36), VID2 (Pin 37), VID1 (Pin 38),
VID0 (Pin 39), VID_SEL (40)
DAC voltage identification inputs for VRD10.x / VRD11 /
K8 / K8_M2 . These pins are internally pulled up to VTT.
Function Block Diagram
VDD
VTT/EN
DVD
SS
VR_Ready
COMP
FB
OFS
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
VID_SEL
FBRTN
Soft Start
& PGOOD
Power On
Reset
Oscillator
&
Ramp
Generator
RT
DAC
Clamp
-
+
TSEN
VR_FAN
VR_HOT
Temperature
Processing
Droop Tune
& Hi-I
Detection
Sample
& Hold
Mux
TCOC
ADJ
IOUT
GND
All brandname or trademark belong to their owner respectively
www.richtek.com
4
DS8802A-04 August 2007
+
CSA
-
+
-
EA
Current
Processing
SUM/N
& OCP
Detection
Pulse
Width
Modulator
& Output
Buffer
PWM1
PWM2
PWM3
PWM4
PWM5
IMAX
Mux
ISN1
ISN24
ISN35
ISP1
Mux
ISP2
ISP3
ISP4
ISP5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
