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MC34702EKR2 Datasheet(PDF) 3 Page - Freescale Semiconductor, Inc |
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MC34702EKR2 Datasheet(HTML) 3 Page - Freescale Semiconductor, Inc |
3 / 38 page Analog Integrated Circuit Device Data Freescale Semiconductor 3 34702 PIN CONNECTIONS PIN CONNECTIONS Figure 3. Pin Connections Table 1. Pin Function Description A functional description of each pin can be found in the Functional Pin Description section beginning on page 16. Pin Pin Name Formal Name Definition 1 FREQ Oscillator Frequency This switcher frequency selection pin can be adjusted by connecting external resistor R F to the FREQ pin. The default switching frequency (FREQ pin left open or tied to V DDI) is set to 300 kHz. 2 INV Inverting Input Buck Controller Error Amplifier inverting input. 3 VOUT Output Voltage Output voltage of the buck converter. Input pin of the switching regulator power sequence control circuit. 4, 5 VIN2 Input Voltage 2 Buck regulator power input. Drain of the high-side power MOSFET. 6, 7 SW Switch Buck regulator switching node. This pin is connected to the inductor. 8, 9 24, 25 GND Ground Analog ground of the IC, thermal heatsinking. 10, 11 PGND Power Ground Buck regulator power ground. 12 VBD Boost Drain Drain of the internal boost regulator power MOSFET. 13 VBST Boost Voltage Internal boost regulator output voltage. The internal boost regulator provides a 20 mA output current to supply the drive circuits for the integrated power MOSFETs and the external N-channel power MOSFET of the linear regulator. The voltage at the V BST pin is 7.75V nominal. 14 BOOT Bootstrap Bootstrap capacitor input. 15 SDA Serial Data I2C bus pin. Serial data. 16 SCL Serial Clock I2C bus pin. Serial clock. 17 LCMP Linear Compensation Linear regulator compensation pin. 18 LFB Linear Feedback Linear regulator feedback pin. 19 LDO Linear Regulator Input pin of the linear regulator power sequence control circuit. CLKSYN 1 EN2 EN1 ADDR GND GND V DD1 V IN1 LDRV CS LFB LCMP LDO RT CLKSEL RST FREQ V IN2 SW SW GND GND PGND PGND VBD VBST SDA SCL BOOT V IN2 INV V OUT 8 9 10 11 12 13 14 15 16 3 4 5 6 7 2 32 25 24 23 22 21 20 19 18 17 30 29 28 27 26 31 |
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