RT9911
Functional Pin Description
Pin No. Pin Name
1
GND
Pin Function
Analog Ground Pin
I/O
--
Internal State at
Shut Down
--
GND
I/O Configuration
OK 2
2
OK2
External Switch Control.
Frequency Setting Pin. Frequency
is 500kHz if RT pin not connected.
Device Input Power Pin
Analog Ground Pin
OUT
OUT
IN
--
High Impedance
VDDM
3
5
6
RT
VDDM
GND
Pull Low
--
--
+
-
RT
GND
VDDM
1.0V
+
-
4
VREF
1.0V Reference Pin
OUT
High Impedance
VREF
7
8
9
10
11
12
13
14
FB1
COMP1
PGND1
LX1
PVDD1
COMP5
FB5
EXT5
Feedback Input Pin of CH1.
Feedback Compensation Pin of
CH1.
Power Ground Pin of CH1.
Switch Node of CH1.
Power Input Pin of CH1.
Feedback Compensation Pin of
CH5.
Feedback Input Pin of CH5.
External Power Switch of CH5.
Power Input Pin of CH4, CH5 and
CH6.
Feedback Compensation Pin of
CH4.
Feedback Input Pin of CH4.
IN
OUT
--
OUT
IN
OUT
IN
OUT
High Impedance
Pull Low
--
High Impedance
--
Pull Low
High Impedance
0.8V
FB1
+
-
COMP1
PVDD1
LX1
PGND1
FB5
COMP5
+
-
PVDD5
Pull High
EXT5
15
16
17
PVDD5
COMP4
FB4
IN
OUT
IN
--
Pull Low
High Impedance
1.0V
FB4
+
-
COMP4
To be continued
www.richtek.com
4
DS9911-04 August 2007
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
