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34704 Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc |
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34704 Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc |
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4 / 54 page  Analog Integrated Circuit Device Data 4 Freescale Semiconductor 34704 PIN CONNECTIONS PIN CONNECTIONS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 42 41 40 39 38 37 36 35 34 33 32 31 30 29 56 55 54 53 52 51 50 49 48 47 46 45 44 43 57 Exposed Pad PGND BT5U BT4D PVIN4 SW4D VOUT4 SW4U BT4U FB4 COMP4 BT3 PVIN3 SW3 VOUT3 FB3 BT2U ONOFF LION VDDI VIN AGND VOUT6 SW6 BT6 FB6 VOUT7 DRV7 FB7 VREF7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 42 41 40 39 38 37 36 35 34 33 32 31 30 29 56 55 54 53 52 51 50 49 48 47 46 45 44 43 57 Exposed Pad PGND BT5U BT4D PVIN4 SW4D VOUT4 SW4U BT4U FB4 COMP4 BT3 PVIN3 SW3 VOUT3 FB3 BT2U ONOFF LION VDDI VIN AGND PGND5 PGND4 NC4 AGND3 PGND2 NC3 AGND1 NC2 34704A 34704B Figure 3. 34704 Pin Connections Table 2. 34704 Pin Definitions 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 1 A/B BT5U Passive REG5 Boost Stage bootstrap capacitor input pin Connect a 1.0 μF capacitor between this pin and SW5U pin to enhance the gate of the Switch Power MOSFET. 2 A/B BT4D Passive REG4 Buck Stage bootstrap capacitor input pin Connect a 0.01 μF capacitor between this pin and SW4D pin to enhance the gate of the Switch Power MOSFET. 3 A/B PVIN4 Power REG4 power supply input voltage This is the connection to the drain of the high side switch FET. Input decoupling /filtering is required for proper REG4 operation. Use a 10uf decoupling capacitor for better performance. 4 A/B SW4D Input/Output REG4 Buck Stage switching node The inductor is connected between this pin and the SW4U pin. 5 A/B VOUT4 Output REG4 regulated output voltage pin Connect this pin to the load and to the output filter as close to the pin as possible. 6 A/B SW4U Input/Output REG4 Boost Stage switching node The inductor is connected between this pin and the SW4D pin. 7 A/B BT4U Passive REG4 Boost Stage bootstrap capacitor input pin Connect a 0.01 μF capacitor between this pin and SW4U pin to enhance the gate of the Switch Power MOSFET. 8 A/B FB4 Input REG4 voltage feedback input for voltage regulation/programming Connect the feedback resistor divider to this pin. 9 A/B COMP4 Passive REG4 compensation network connection REG4 compensation network connection. 10 A/B BT3 Passive REG3 bootstrap capacitor input pin Connect a 0.01 μF capacitor between this pin and SW3 pin to enhance the gate of the Switch Power MOSFET. |
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