rt9246 Richtek Technology Corporation, rt9246 Datasheet - Page 3

• Manufacturer Part Number: rt9246
• Description: Multi-phase Controller Core Power Supply
• Manufacturer: Richtek Technology Corporation

Functional Pin Description
VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4),
VID0 (Pin 5)
DAC
internally pulled to 2.4V if left open.
SS2 (Pin 6)
DAC O/P ramping speed control for K8. Connect this pin
to GND with a capacitor to set the rising/falling time at
VID jump.
SGND (Pin 7)
V
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
input.
SS (Pin 12)
Connect this SS pin to GND with a capacitor to set the
soft-start time interval.
DS9246-06 March 2007
CORE
450
400
350
300
250
200
150
100
voltage identification inputs for K8. These pins are
50
0
differential sense negative input.
0
10
Frequency vs. R
20
30
detection or converter enable
R
RT
(k Ω)
40
RT
50
60
70
RT (Pin 13)
Switching frequency setting. Connect this pin to GND with
a resistor to set the frequency.
VOSS (Pin 14)
V
resistor to set the offset value.
IMAX (Pin 15)
Over-Current protection set.
VSEN (Pin 16)
V
VDIF (Pin 17)
V
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.
ISN23 (Pin 20)
R
channel sense components' GND node.
ISP1 (Pin 23), ISP2 (Pin 22), ISP3 (Pin 21)
R
channels. Tie this pin to the component's sense node.
ISN1 (Pin 24)
R
sense component's GND node.
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.
CORE
CORE
CORE
DS(ON)
DS(ON)
DS(ON)
differential sense positive input.
initial value offset. Connect this pin to GND with a
differential sense output.
current sense inputs from converter 2
current sense inputs from converter 1
current sense inputs for individual converter
RT9246
www.richtek.com
nd
& 3
st
channel
rd
phase
3