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RT9901 データシート(PDF) 5 Page - Richtek Technology Corporation |
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RT9901 データシート(HTML) 5 Page - Richtek Technology Corporation |
5 / 19 page RT9901 Preliminary 5 DS9901-12 August 2007 www.richtek.com Pin No. Pin Name Pin Function 1 COMP3 CH3 feedback compensation pin. 2 VDD3 CH3 power input pin. 3 LX3 CH3 switch node. Drains of the internal P-channel and N-MOSFET switches. Connect an inductor to LX3 pins together as close as possible. 4 PGND3 Power ground for CH3. 5 SS Sets the soft start interval of the converter. Connect a capacitor from this pin to ground. 6 RT Frequency setting resistor connection pin. Frequency is 500KHz if RT pin not connected 7 GND Analog Ground 8 LBO Voltage detector output. 9 VDDM Device input power pin. 10 LBI Voltage detector feedback input. 11 FB1 CH1 feedback input pin. 12 COMP1 CH1 feedback compensation pin. 13 CPFB Charge pump feedback pin. 14 VDDC Charge pump power input pin. 15 CX Charge pump external driver pin. 16 PGND1 Power ground for CH1. 17 VDD1 CH1 power input pin. Connect output of Boost to this pin. 18, 19 LX1 CH1 switch node. Connect an inductor to LX1 pins together as close as possible. 20 PGND2 Power ground for CH2. 21, 22 LX2 CH2 switch node. Drains of the internal P-channel and N-MOSFET switches. Connect an inductor to LX2 pins together as close as possible. 23, 24 VDD2 CH2 power input pin. 25 ENM Whole device control pin. Tie this pin higher than 1.3V to enable the device. Tie below 0.4V to turn off the device. 26 EN1 CH1 enable input. Tie this pin higher than 1.3V to enable CH1. Tie below 0.4V to turn off the CH1. 27 COMP2 CH2 feedback compensation pin. 28 FB2 CH2 feedback input. 29 EN2 CH2 enable input. Tie this pin higher than 1.3V to enable CH2. Tie below 0.4V to turn off the CH2. 30 EN3 CH3 enable input. Tie this pin higher than 1.3V to enable CH3. Tie below 0.4V to turn off the CH3. 31 GND Analog ground. 32 FB3 CH3 feedback input. Exposed Pad (33) GND The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. Functional Pin Description |
同様の部品番号 - RT9901 |
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同様の説明 - RT9901 |
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