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MC34704AR2 Arkusz danych(PDF) 5 Page - Freescale Semiconductor, Inc |
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MC34704AR2 Arkusz danych(HTML) 5 Page - Freescale Semiconductor, Inc |
5 / 54 page Analog Integrated Circuit Device Data Freescale Semiconductor 5 34704 PIN CONNECTIONS 11 A/B PVIN3 Power REG3 power supply input voltage This is the connection to the drain of the high side switch FET. Input decoupling /filtering is required for proper REG3 operation. Use a 10uf decoupling capacitor for better performance. 12 A/B SW3 Output REG3 switching node The inductor is connected between this pin and the regulated REG3 output. 13 A/B VOUT3 Output REG3 output voltage return pin This is the discharge path of REG3 output voltage. 14 A/B FB3 Input REG3 voltage feedback input for voltage regulation/programming Connect the feedback resistor divider to this pin. 15 A/B SS Input Soft start time The soft start time for all regulators can be adjusted by connecting this pin to an external resistor divider between VDDI and AGND pins. 16 A/B FREQ Input Oscillator frequency The oscillator frequency can be adjusted by connecting this pin to an external resistor divider between VDDI and AGND pins. This pin sets FSW1 value. 17 A/B FB8 Input REG8 voltage feedback input for voltage regulation/programming Connect the feedback resistor divider to this pin. 18 A/B BT8 Passive REG8 bootstrap capacitor input pin Connect a 0.01 μF capacitor between this pin and SW8 pin to enhance the gate of the Synchronous Power MOSFET. 19 A/B VOUT8 Output REG8 regulated output voltage pin Connect this pin directly to the load directly and to the output filter as close to the pin as possible. 20 A/B SW8 Output REG8 switching node The inductor is connected between this pin and the VIN pin. 21 A/B SW1 Output REG1 switching node The inductor is connected between this pin and the VIN Pin. 22 A/B VG Passive REG1 regulated output voltage before the cutoff switch REG1 regulated output voltage before the cut-off switch. This supplies the internal circuits and the gate drive 23(1) A VOUT1 Output REG1 regulated output voltage pin. Connect this pin directly to the load directly and to the output filter as close to the pin as possible. B NC0 No Connect - Pin 23 is not connected. 24 A/B BT1 Passive REG1 bootstrap capacitor input pin Connect a 1.0 μF capacitor between this pin and SW1 pin to enhance the gate of the Switch Power MOSFET. 25 A/B SCL Input/Output I2C serial interface clock input I2C serial interface clock input. 26 A/B SDA Input/Output I2C serial interface data input I2C serial interface data input. 27 A/B RST Open Drain Power reset output signal (Microprocessor Reset) This is an open drain output and must be pulled up by an external resistor to a supply voltage like VIN. 28 A COMP7 Passive REG7 compensation network connection REG7 compensation network connection. B NC1 No Connect - Pin 28 is not connected 29 A VREF7 Output REG7 resistor feedback network reference voltage Connect this pin to the bottom of the feedback resistor divider. B NC2 No Connect - Pin 29 is not connected Table 2. 34704 Pin Definitions (continued) A functional description of each pin can be found in the Functional Pin Description section beginning on page 17. Pin Number Device Pin Name Pin Function Formal Name Definition |
Podobny numer części - MC34704AR2 |
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Podobny opis - MC34704AR2 |
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