rt9237 ETC-unknow, rt9237 Datasheet - Page 6

• Manufacturer Part Number: rt9237
• Description: Multi-phase Dc/dc Controller Core Power Supply
• Manufacturer: ETC-unknow

RT9237
Functional Pin Description
VID4, VID3, VID2, VID1 and VID0 ( Pin1,2,3,4,5)
DAC voltage identification inputs for VRM9.0. These
pins are TTL-compatible and internally pulled to VDD
if left open.
COMP (Pin 6)
Output of the error amplifier and input of the PWM
comparator.
FB (Pin 7)
Inverting input of the internal error amplifier.
ADJ (Pin 8)
Current sense output for active droop adjust.
Connect a resistor from this pin to GND to set the
amount of load droop.
GND (Pin 9)
Ground for the IC.
VSEN (Pin 10)
Power good and over voltage monitor input. Connect
to the microprocessor-CORE voltage.
IRMP (Pin 11)
PWM ramp amplitude set by external resistor. Ramp
amplitude = 1V × (R [IRMP] / 56KΩ)
DVD (Pin 12)
Programmable power UVLO detection input. Trip
threshold = 1.25V at V(DVD) rising
IMAX (Pin 13)
Over current protection amplitude set.
SS (Pin 14)
Connect this SS pin to GND with a capacitor to set
the start time interval. Pull this pin below 1V(ramp
valley of saw-tooth wave in pulse width modulator) to
shutdown the converter output.
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6
Preliminary
ISEN1 (Pin 18), ISEN2 (Pin 17), ISEN3 (Pin 16) and
ISEN4 (Pin 15)
Current sense inputs from the individual converter
channel’s sense component GND nodes.
ISP1 (Pin 24), ISEN2 (Pin 21), ISEN3 (Pin 20) and
ISEN4 (Pin 25)
Current
channels. Tie this pin to the component sense node.
PWM1 (Pin 23), PWM2 (Pin 22), PWM3 (Pin 19)
and PWM4 (Pin 26)
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.
PGOOD (Pin 27)
Power good open-drain output.
VDD (Pin 28)
IC power supply. Connect this pin to a 5V supply.
sense
inputs
for
DS9237-00 January 2002
individual
converter