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RT9244 Datasheet(PDF) 3 Page - Richtek Technology Corporation

Part No. RT9244
Description  Multi-Phase PWM Controller for CPU Core Power Supply
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Maker  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
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RT9244 Datasheet(HTML) 3 Page - Richtek Technology Corporation

 
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RT9244
3
DS9244-06 March 2007
www.richtek.com
Functional Pin Description
SS (Pin 1)
Connect this SS pin to GND with a capacitor to set the
start time interval. Pull this pin below 1V (ramp valley of
sawtooth wave in pulse width modulator) to shutdown the
converter output.
OVP (Pin 2)
Over voltage trip output.
VID4 (Pin 3), VID3 (Pin 4), VID2 (Pin 5), VID1 (Pin 6),
VID0 (Pin 7)
DAC voltage identification inputs for K8. These pins are
internally pulled to 2.4V if left open.
VOSS (Pin 8)
V
CORE initial value offset. Connect this pin to GND with a
resistor to set the offset value.
COMP (Pin 9)
Output of the error amplifier and input of the PWM
comparator.
FB (Pin 10)
Inverting input of the internal error amplifier.
ADJ (Pin 11)
Current sense output for active droop adjust. Connect a
resistor from this pin to GND to set the load droop.
VDIF (Pin 12)
V
CORE differential sense output.
VSEN (Pin 13)
V
CORE differential sense positive input.
SGND (Pin 14)
V
CORE differential sense negative input.
to GND with a capacitor to set the rising/falling time at VID
jump.
VCC (Pin 20)
IC power supply. Connect this pin to a 5V supply.
GND (Pin 21)
Ground for the IC.
PWM1 (Pin 26), PWM2 (Pin 25), PWM3 (Pin 21) &
PWM4 (Pin 29)
PWM outputs for each driven channel. Connect these pins
to the PWM input of the MOSFET driver. For systems
which use 3 channels, connect PWM4 high. Two channel
systems connect PWM3 and PWM4 high.
ISP1 (Pin 27), ISP2 (Pin 23), ISP3 (Pin 22) & ISP4
(Pin 28)
RDS(ON) current sense inputs for each individual converter
channel. Tie this pin to the component's sense node.
PGOOD (Pin 30)
Power good open-drain output.
RT (Pin 31)
Switching frequency setting. Connect this pin to GND with
a resistor to set the frequency.
(k
Ω)
Frequency vs. RRT
0
50
100
150
200
250
300
350
400
450
0
10
20304050
6070
RRT
ISN1 (Pin 18), ISN2 (Pin 17), ISN3 (Pin 16) & ISN4
(Pin 15)
RDS(ON) current sense inputs from each individual converter
channel sense component's GND node.
SS2 (Pin 19)
DAC O/P ramping speed control for K8. Connect this pin
DVD (Pin 32)
Programmable power UVLO detection input. Trip threshold
= 2.0V at V
DVD rising.


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