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MC34700 Datasheet(PDF) 8 Page - Freescale Semiconductor, Inc |
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MC34700 Datasheet(HTML) 8 Page - Freescale Semiconductor, Inc |
8 / 28 page PIN CONNECTIONS FUNCTIONAL PIN DESCRIPTIONS Analog Integrated Circuit Device Data 8 Freescale Semiconductor 34700 PIN CONNECTIONS FUNCTIONAL PIN DESCRIPTIONS Table 3. 34700 Pin Definitions Pin Name Pin Description 1,32 VIN1 Buck regulator #1’s power input voltage. VIN1 is connected to the drain of the DC/DC #1’s high side MOSFET. Local bypass capacitors are recommended. 2,3 SW1 Buck regulator #1’s switching node. SW1 is connected to the source of the high side MOSFET. Connect this pin to the cathode of the catch diode and the output inductor. 4 BST1 Buck regulator #1’s bootstrap capacitor input. Connect a capacitor between the BST1 and SW1 pin of DC/DC #1 to enhance the gate of the high side MOSFET during switching. 5 GND2 Buck regulator #2’s power ground. GND2 is connected to the source of DC/DC #2’s low side MOSFET. Connect this pin to the DC/DC #2’s power return path. 6 SW2 Buck regulator #2’s switching node. SW2 is connected to source of the high side and the drain of the low side MOSFET. Connect this pin to the output inductor. 7 VIN2 Buck regulator #2’s power input voltage. VIN2 is connected to the drain of the DC/DC #2’s high side MOSFET. Local bypass capacitors are recommended. 8 BST2 Buck regulator #2’s bootstrap capacitor input. Connect a capacitor between the BST2 and SW2 pin of DC/DC #2 to enhance the gate of the high side MOSFET during switching. 9 COMP2 Buck regulator #2’s compensation output. COMP2 is connected to DC/DC #2’s error amplifier’s output. Connect the required external compensation network between the COMP2 pin and the FB2 pin. 10 FB2 DC/DC #2’s error amplifier inverting input. Connect the required compensation network and feedback network to this terminal as appropriate. 11 EN1 This input enables buck regulator #1. Asserting EN1 high turns on DC/DC #1. The internal control logic remains active as long as VIN is present. 12 EN2 This input enables buck regulator #2. Asserting EN2 high turns on DC/DC #2. The internal control logic remains active as long as VIN is present. VIN1 SW1 SW1 BST1 GND2 SW2 VIN2 BST2 BST3 VIN3 SW3 LDO_FB LDO LDO_VIN VIN GND3 TRANSPARENT TOP VIEW 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 27 19 20 21 22 23 24 25 26 28 29 30 31 32 PIN 33 Figure 3. 34700 Pin Connections |
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