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MC34703R2 Arkusz danych(PDF) 4 Page - Freescale Semiconductor, Inc |
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MC34703R2 Arkusz danych(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 46 page Analog Integrated Circuit Device Data 4 Freescale Semiconductor 34703 PIN CONNECTIONS 4 V IN1 Input Input Voltage 1 The input supply pin for the integrated circuit. The internal circuits of the IC are supplied through this pin. 5 SCL Input Serial Clock I2C bus pin. Serial clock. 6 FREQ Input Oscillator Frequency The switcher oscillator frequency can be adjusted by connecting an external resistor RF to the FREQ pin. The default switching frequency (FREQ pin left open or tied to VDDI) is ~300 kHz. 7 ADDR Input Address I2C address selection. This pin can be either left open, tied to VDDI, or grounded through a 10 k Ω resistor. 8 RESET Output Reset The Reset pin indicates to the external circuitry when one of the regulators protection features has been activated. Note, since it is an open drain output it has to be pulled up to some supply voltage (e.g., the output of the LDO) by an external resistor. 9 LCMP Input Linear Compensation Linear regulator compensation pin. 10 ISNS Input Current Sense Current sense pin of the LDO to provide overcurrent protection of the linear regulator’s external power MOSFET. The voltage drop over the LDO current sense resistor RS is sensed between the ISNS and the LDO pins. The LDO current limit can be adjusted by selecting the proper value of the current sense resistor RS. 11 LDO Input Linear Regulator Input pin of the linear regulator power sequence and current limit control circuits. 12 V BD Output Boost Voltage Drain Drain of the internal boost regulator's switching power MOSFET. 13 VBST SENSE Input Boost Voltage Sense Note, this pin must be connected to VBST (pin 1) and is not intended to provide power to external circuitry. 14 EN1 Input Enable Pin 1 Enable 1 Input. The combination of the logic state of the Enable 1 and Enable 2 inputs determine operation mode and type of power sequencing of the IC. 15 SDA Input/Output Serial Data I2C bus pin. Serial data. 16 CLKSYN Input/Output Clock Sync Input/ Oscillator Output Oscillator synchronization input pin or oscillator output pin. The CLKSYN pin can be configured either as an oscillator output when the CLKSEL pin is left open or it can be used as a synchronization input when the CLKSEL pin is grounded. 17 VDDI Passive Vdd Filter Internal supply voltage capacitor pin. A ceramic low ESR 1.0 µF capacitor in parallel with a ceramic 100nF capacitor should be connected from this pin to ground. The VDDI power supply voltage is for internal use only; do not use externally. 18 GND Signal Ground Analog ground of the IC. 19 RT Passive Reset Timer This pin allows programming the Power-ON Reset delay by means of an external RC network. 20 LDRV Output LDO Gate Drive LDO gate drive of the external pass N-channel MOSFET. 21 LFB Input LDO Feedback Linear regulator feedback pin. 22 VOUT Output Output Voltage Power Sequencing Control This pin must be directly connected to the output voltage of the buck converter. This pin controls the buck regulators output voltage (Vout) in accordance with the power sequencing control mode set by EN1 and EN2. 23 INV Input Error Amp Buck Controller Error Amplifier inverting input. 24 COMP Input Switcher Compensation Buck converter compensation pin. Table 1. 34703 Pin Definitions (continued) A functional description of each pin can be found in the Functional Pin Description section beginning on page 15. Pin Number Pin Name Pin Function Formal Name Definition |
Podobny numer części - MC34703R2 |
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Podobny opis - MC34703R2 |
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