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RT9210 数据表(PDF) 3 Page - Richtek Technology Corporation |
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RT9210 数据表(HTML) 3 Page - Richtek Technology Corporation |
3 / 17 page RT9210 Preliminary DS9210-05 March 2007 3 www.richtek.com Functional Pin Description UGATE1 (Pin 1) VDDQ upper gate driver output. Connect to gate of the high- side power N-MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the upper MOSFET has turned off. BOOT1 (Pin 2) Bootstrap supply pin for the upper gate driver. Connect the bootstrap capacitor between BOOT1 pin and the PHASE1 pin. The bootstrap capacitor provides the charge to turn on the upper MOSFET. PHASE1 (Pin 3) Connect this pin to the source of the upper MOSFET and the drain of the lower MOSFET. PHASE1 is used to monitor the voltage drop across the upper MOSFET of the VDDQ regulator for over-current protection. VREF (Pin 4) Buffered internal reference voltage of VDDQ / 2. This output should be used to provide the reference voltage for the Northbridge chipset and DDR memory. FB1 (Pin 5) VDDQ feedback voltage. This pin is the inverting input of the error amplifier. FB1 senses the VDDQ through an external resistor divider network. COMP1 (Pin 6) VDDQ external compensation. This pin internally connects to the output of the error amplifier and input of the PWM comparator. Use a RC + C network at this pin to compensate the feedback loop to provide optimum transient response. SENSE1 (Pin 7) This pin is connected directly to the regulated output of VDDQ supply. This pin is also used as an input to create the voltage at VREF. VREF_IN (Pin 8) This pin is used as an option to overdrive the internal resistor divider network that sets the voltage for both VREF and the reference voltage for the VTT supply. A 100pF capacitor between VREF_IN and ground is recommended for proper operation. GNDA (Pin 9) Signal ground for the IC. All voltage levels are measured with respect to this pin. Ties the pin directly to ground plane with the lowest impedance. BOOT2 (Pin 11) Bootstrap supply pin for the upper gate driver. Connect the bootstrap capacitor between BOOT2 pin and the PHASE2 pin. The bootstrap capacitor provides the charge to turn on the upper MOSFET. UGATE2 (Pin 12) VTT upper gate driver output. Connect to gate of the high- side power N-MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the upper MOSFET has turned off. PGND2 (Pin 13) Return pin for high currents flowing in low-side power N-MOSFET. Ties the pin directly to the low-side MOSFET source and ground plane with the lowest impedance. LGATE2 (Pin 14) VTT lower gate driver output. Connect to gate of the low- side power N-MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the lower MOSFET has turned off. VCC (Pin 15) Connect this pin to a well-decoupled 5V bias supply. It is also the positive supply for the lower gate driver, LGATE2. |
类似零件编号 - RT9210 |
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类似说明 - RT9210 |
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