RT9248A データシートの表示（PDF） - Richtek Technology
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RT9248A Datasheet PDF : 14 Pages
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Preliminary
RT9248A
Functional Pin Description
VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4),
VID0 (Pin 5) & VID125 (Pin 6)
DAC voltage identification inputs. Tie VID125 to GND for
VRM9 or to VCC for VRD10. These pins are internally
pulled to 3.3V if left open.
SGND (Pin 7)
Connect this pin to the return pin of VCORE .
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.
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.
450
400
350
300
250
200
150
100
50
0
0
Frequency vs. RRT
10 20 30 40 50 60 70
RRT (k Ω)
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.
VSEN (Pin 16)
Power good and over-voltage monitor input. Connect this
to the sense pin of VCORE.
VDIF (Pin 17)
This pin is being tied to VSEN pin internally.
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.
ISN (Pin 20)
RDS(ON) current sense input from anyone of channel sense
components' GND node.
ISP1 (Pin 23), ISP2 (Pin 22), ISP3 (Pin 21)
RDS(ON) current sense inputs for individual converter
channels. Tie this pin to the component's sense node.
NC (Pin 24)
No internal connection.
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.
DS9248A-06 March 2006
www.richtek.com
3
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