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RT9246PC Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT9246PC Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 17 page  RT9246 3 DS9246-06 March 2007 www.richtek.com Functional Pin Description VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4), VID0 (Pin 5) DAC voltage identification inputs for K8. These pins are 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) VCORE differential sense negative input. 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. 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) VCORE differential sense positive input. VDIF (Pin 17) VCORE differential sense output. 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) RDS(ON) current sense inputs from converter 2 nd & 3rd phase 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. ISN1 (Pin 24) RDS(ON) current sense inputs from converter 1 st channel 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. (k Ω) Frequency vs. RRT 0 50 100 150 200 250 300 350 400 450 0 10 20304050 6070 RRT |
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