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RT9245C Datasheet(PDF) 4 Page - Richtek Technology Corporation |
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RT9245C Datasheet(HTML) 4 Page - Richtek Technology Corporation |
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4 / 25 page  RT9245C 4 DS9245C-02 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 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) 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 input. Trip threshold = 1.0V at VDVD rising. 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 negative offset value. Connect this pin to VCC to set positive offset value. IMAX (Pin 15) Programmable over currert setting. CSN (Pin 16) Current sense negative input of all channels. 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. |
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