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MC34700EP 数据表(PDF) 4 Page - Freescale Semiconductor, Inc |
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MC34700EP 数据表(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 31 page Analog Integrated Circuit Device Data 4 Freescale Semiconductor 34700 PIN CONNECTIONS 16 COMP3 Output DC/DC3 Compensation Output Buck regulator #3 compensation output. COMP3 is connected to the error amplifiers output. 17 BST3 Input Bootstrap3 Bootstrap capacitor input for DC/DC3. 18 VIN3 Power Input DC/DC3 Power Input Buck regulator #3 power input. VIN3 is connected to the drain of DC/ DC3’s high side MOSFET. 19 SW3 Output Switch 3 Output Buck regulator #3 switching node. SW3 is connected to the source of the high side MOSFET and the drain of the low side MOSFET. 20 GND3 Power Ground Power Ground Buck regulator #3 power ground. GND3 is connected to the source of DC/ DC3’s low side MOSFET. 21 LDO_FB Input LDO Feedback Input The LDO’s error amplifier inverting input. Connect the output voltage feedback resistor divider to this pin. 22 LDO Output Linear Regulator Output LDO output connection. 23 LDO_VIN Power Input Input supply for the Linear Regulator The LDO’s power input. LDO_VIN is connected to the drain of the linear regulator’s MOSFET. 24 VIN Input Input Supply Voltage The IC’s supply voltage input. 25 VGREG Output Gate driver Supply Voltage Output Internal regulator used to supply the gate drivers of the buck regulators. 26 VDDI Output Internal Core Voltage Output Internal regulator used to supply the internal logic and analog blocks. 27 PGOOD Output Power Good Output Signal Status signal used to indicate that all the regulators’ output voltages are good. Upon a fault occurrence this output goes low. 28 AGND Ground Ground Analog ground of the IC. All signals are referenced to this pin. 29 VOUT1 Input VOUT1 Shunt Buck regulator #1’s shunt input. VOUT1 is connected to a discharge MOSFET. 30 FB1 Input DC/DC1 Feedback Input Buck regulator #1’s error amplifier inverting input. Connect the output voltage feedback resistor divider and compensation network to this pin. 31 COMP1 Output DC/DC1 Compensation Output Buck regulator #1 compensation output. COMP1 is connected to the error amplifiers output. 33 GND Ground Thermal Pad Thermal pad for heat transfer. Connect the thermal pad to the analog ground and ground plane for heat sinking. Table 1. 34700 Pin Definitions (continued) Pin Number Pin Name Pin Function Formal Name Definition |
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类似说明 - MC34700EP |
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