rt9245c Richtek Technology Corporation, rt9245c Datasheet - Page 4

• Manufacturer Part Number: rt9245c
• Description: Multi-phase Controller Core Power Supply
• Manufacturer: Richtek Technology Corporation

RT9245C
Functional Pin Description
VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4),
VID0 (Pin 5)
DAC voltage identification inputs for VRD10.x. These pins
are internally pulled to 1.2V (VRD10.x) or 2.1V (K8) if left
open.
VID125/VIDSEL (Pin 6)
When this pin pull low or left pen -->VR10 VID input, pull
high to 5V -->K8.
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 detection input. Trip threshold
= 1.0V at V
SS (Pin 12)
Connect this SS pin to GND with a capacitor to set the
soft-start time interval.
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 negative offset value. Connect this pin
to VCC to set positive offset value.
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CORE
CORE
differential sense negative input.
initial value offset. Connect this pin to GND with a
DVD
rising.
IMAX (Pin 15)
Programmable over currert setting.
CSN (Pin 16)
Current sense negative input of all
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)
Ground for the IC.
CSP1 (Pin 20), CSP2 (Pin 22), CSP3 (Pin 21) & CSP4
(Pin 23)
Current sense positive inputs for individual converter
channel current sense.
PWM1 (Pin 27), PWM2 (Pin 26), PWM3 (Pin 25) &
PWM4 (Pin 24)
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 high.
VCC (Pin 28)
IC power supply. Connect this pin to a 5V supply.
DS9245C-02 March 2007
channels.