RT9246A View Datasheet(PDF) - Richtek Technology
Part Name
Description
Manufacturer
RT9246A Datasheet PDF : 16 Pages
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Functional Pin Description
VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4),
VID0 (Pin 5)
DAC voltage identification inputs for K8. These pins are
internally pulled to 2.2V if left open.
NC (Pin 6, Pin 20, Pin 24)
No Input Connection
FBRTN (Pin 7)
VCORE differential sense return.
FB (Pin 8)
Inverting input of the internal error amplifier.
COMP (Pin 9)
Output of the error amplifier and input of the PWM
comparator.
PGOOD (Pin 10)
Power good open-drain output.
DVD (Pin 11)
Programmable power UVLO detection or converter enable
input.
Oscillator Ferquency vs. RRT
700
600
500
400
300
200
100
0
0
10 20 30
40 50
60 70
RRT (k◊Ω)
RT9246A
SS (Pin 12)
Connect this SS pin to GND with a capacitor to set the
soft-start time interval and to smooth VCORE transient at
VID Jump.
RT (Pin 13)
Switching frequency setting. Connect this pin to GND with
a resistor to set the frequency.
VOSS (Pin 14)
VCORE initial value offset. Connect this pin to GND with a
resistor to set the offset value.
IMAX (Pin 15)
Over-Current protection set.
ICOMMON (Pin 16)
Common negative input of current sense amplifiers for all
three channels.
IOUT (Pin 17)
Output current indication pin. The current through IOUT
pin is proportional to the output current.
ADJ (Pin 18)
Current sense output for active droop adjust. Connect a
resistor from this pin to GND to set the load droop.
GND (Pin 19)
IC ground.
ISP1 (Pin 23), ISP2 (Pin 22), ISP3 (Pin 21)
Current sense positive input pins for individual converter
channel current sensing.
PWM1 (Pin 27), PWM2 (Pin 26), PWM3 (Pin 25)
PWM outputs for each driven channel. Connect these pins
to the PWM input of the MOSFET driver. For systems
which use 2 channels, connect PWM3 high.
VCC (Pin 28)
IC power supply. Connect this pin to a 5V supply.
DS9246A-04 March 2007
www.richtek.com
3
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