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RT9256GQV Datasheet(PDF) 7 Page - Richtek Technology Corporation |
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RT9256GQV Datasheet(HTML) 7 Page - Richtek Technology Corporation |
7 / 18 page RT9256 Preliminary 7 DS9256-07 August 2007 www.richtek.com Functional Pin Description CSN1 (Pin 1), CSN2 (Pin 8) Current SenseNegative Input. These pins are negative input nodes of the current sense amplifiers used for DCR current sensing. Connect this pin with a resistor to the output node. CSP1 (Pin 2), CSP2 (Pin 7) Current Sense Positive Input. These pins are positive input nodes of the current sense amplifiers used for DCR current sensing. Connect this pin to the junction of the filter resistor and capacitor. COMP1 (Pin 3), COMP2 (Pin 6) Compensation Pin. In dual switching mode, these pins are output nodes of the error amplifiers. In two phase mode, only COMP1 is active. FB1 (Pin 4), FB2 (Pin 5) Feedback Pin. In dual-switching mode, these pins are negative input pins of the error amplifiers.When SS pass VCC5 − 1.3 and FB1 or FB2 < 0.6V, the UV protection function will be activated. The two-phase mode is activated by pulling FB2 above 4V when POR. The UV protection function will be enabled if FB1 < 0.6 when the SS pass VCC5 − 1.3. RR2 (Pin 9), RR1 (Pin 32) Ramp resistor. These pins are used to set the ramp voltages. Connecting a resistor from this pin to its converter input power sets the ramping slope of the control loop of the converter. Since it is connected to converter input power, the ramp slope is input-feed-forwarded. As VIN > 1.8V, RR pin is enable for ramp setting. IMAX2 (Pin 10), IMAX1 (Pin 31) Maximum Current Setting. These pins set the current limiting levels. Connect these pins with resistors to ground to set the current limit. SS2 (Pin 11), SS1 (Pin 30) Soft-start Pin. These pins provide soft-start function for their respective controllers. The COMP voltage of the converter follows the ramping voltage on the SS pin. RT (Pin 13) Timing Resistor. Connect a resistor from RT to GND to set the clock frequency. EN (Pin 14) Enable Pin. Pull the EN pin above 0.8V at POR (VCC5 > 4.2V), the whole chip function will be enabled. BOOT2 (Pin 15), BOOT1 (Pin 26) Bootstrap Power Pin. These pins power the high-side MOSFET drivers. Connect this pin to the junction of the bootstrap capacitor with the cathode of the bootstrap diode. Connect the anode of the bootstrap diode to the PVCC pin. UGATE2 (Pin 16), UGATE1 (Pin 25) Upper Gate Drive. These pins drive the gates of the high- side MOSFETs. LGATE2 (Pin 19), LGATE1 (Pin 22) Lower Gate Drive. These pins drive the gates of the low- side MOSFETs. PHASE2 (Pin 17), PHASE1 (Pin 24) These pins are return nodes of the high-side drivers. Connect these pins to high-side MOSFET sources together with the low-side MOSFET drains and the inductor. GND (Pin 12) Chip Ground. PGND (Pin 18 and 23) DriverGround. PVCC (Pin 20 and 21) Driver Power. VCC5 (Pin 28), VCC (Pin 29) The VCC5 pin is the internal 5.2V regulator output powered from the external voltage (VCC). VCC5 is dedicated for RT9256 internal use only and not for external power source. |
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