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MCZ34702 Dataheets PDF



Part Number MCZ34702
Manufacturers Freescale Semiconductor
Logo Freescale Semiconductor
Description 3.0A Switch-Mode Power Supply
Datasheet MCZ34702 DatasheetMCZ34702 Datasheet (PDF)

Freescale Semiconductor Technical Data Document Number: MC34702 Rev 7.0, 8/2007 3.0A Switch-Mode Power Supply with Linear Regulator The 34702 provides the means to efficiently supply the Freescale Power QUICC™ I, II, and other families of Freescale microprocessors and DSPs. The 34702 incorporates a high performance switching regulator, providing the direct supply for the microprocessor’s core, and a low dropout (LDO) linear regulator control circuit providing the microprocessor I/O and bus vol.

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Freescale Semiconductor Technical Data Document Number: MC34702 Rev 7.0, 8/2007 3.0A Switch-Mode Power Supply with Linear Regulator The 34702 provides the means to efficiently supply the Freescale Power QUICC™ I, II, and other families of Freescale microprocessors and DSPs. The 34702 incorporates a high performance switching regulator, providing the direct supply for the microprocessor’s core, and a low dropout (LDO) linear regulator control circuit providing the microprocessor I/O and bus voltage. The switching regulator is a high efficiency synchronous buck regulator with integrated N-channel power MOSFETs to provide protection features and to allow space-efficient, compact design. The 34702 incorporates many advanced features; e.g., precisely maintained up/down power sequencing, ensuring the proper operation and protection of the CPU and power system. Features • • • • • • • • • Operating voltage from 2.8V to 6.0V High-accuracy output voltages Fast transient response Switcher output current up to 3.0A Under-voltage lockout and over-current protection Enable inputs and programmable watchdog timer Voltage margining via I2C™ bus Reset with programmable power-ON delay Pb-free packaging designated by suffix code EW I2C is a trademark of Philips Corporation. 34702 POWER SUPPLY EW (PB-FREE) SUFFIX 98AARH99137A 32-PIN SOICW ORDERING INFORMATION Device MCZ34702EW/R2 Temperature Range (TA) -40 to 85°C Package 32 SOICW 2.8 V to 6.0 V Input 34702 VIN2 VIN1 LDRV CS LDO LFB MPC8xxx RST BOOT SW VOUT PGND INV VDDI VBST Adjustable: 0.8 V to VIN Dropout PORESET Other Circuits Adjustable: 0.8 V to VIN Dropout VDDH (I/Os) www.DataSheet4U.com VBD VBST RT ADDR SDA SCL GND EN1 EN2 CLKSYN CLKSEL Optional FREQ VDDL (Core) Figure 1. 34702 Simplified Application Diagram Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as may be required, to permit improvements in the design of its products. © Freescale Semiconductor, Inc., 2007. All rights reserved. INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM VIN1 VIN VDDI Internal Supply 8.0 V VDDI VDDI VBST Power Enable VDDI Bandgap Voltage Reference VDDI VLDO Power Sequencing Reset Q6 Reset Control POR Timer SysCon INV LFB I 2C Voltage Margining VOUT Watchdog Timer Current Limit Control VDDI Buck HS and LS Driver Q1 VIN2 (2) VBST BOOT Power Down Power Seq UVLO Q4 VDDI Linear Regulator Control ILim LFB LCMP To Reset Control LDRV CS VBST VBST VBD Q5 Boost Control VREF VREF EN1 EN2 RST RT www.DataSheet4U.com I2C Control Thermal Limit ADDR SDA SCL Switcher Oscillator 300 kHz Ramp Gen. I2C Interface PWM Comp Error Amp CLKSEL CLKSYN FREQ Figure 2. 34702 Simplified Internal Block Diagram 34702 2 + VREF - LDO VREF VBST SysCon SoftSt Buck Control Logic SW (2) Q2 PGND (2) + + 0.8 V To Reset Control INV VOUT VOUT Q3 - - Power Seq GND (4) Analog Integrated Circuit Device Data Freescale Semiconductor PIN CONNECTIONS PIN CONNECTIONS FREQ INV VOUT VIN2 VIN2 SW SW GND GND PGND PGND VBD VBST BOOT SDA SCL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 CLKSYN CLKSEL RST RT EN2 EN1 ADDR GND GND VDD1 VIN1 LDRV CS LDO LFB LCMP 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 1 Pin Name FREQ Formal Name Oscillator Frequency Definition This switcher frequency selection pin can be adjusted by connecting external resistor RF to the FREQ pin. The default switching frequency (FREQ pin left open or tied to VDDI) is set to 300kHz. Buck controller error amplifier inverting input. Output voltage of the buck converter. Input pin of the switching regulator power sequence control circuit. Buck regulator power input. Drain of the high side power MOSFET. Buck regulator switching node. This pin is connected to the inductor. Analog ground of the IC, thermal heatsinking. 2 3 INV VOUT Inverting Input Output Voltage 4, 5 6, 7 VIN2 SW Input Voltage 2 Switch Ground www.DataSheet4U.com 8, 9 GND 24, 25 10, 11 12 13 PGND VBD VBST Power Ground Boost Drain Boost Voltage Buck regulator power ground. Drain of the internal boost regulator power MOSFET. Internal boost regulator output voltage. The internal boost regulator provides a 20mA 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 VBST pin is 7.75V nominal. Bootstrap capacitor input. I2C bus pin. Serial data. I2C bus pin. Serial clock. Linear regulator compensation pin. Linear regulator feedback pin. Input pin of the linear regulator power sequence control circuit. 14 15 16 17 18 19 BOOT SDA SCL LCMP LFB LDO Bootstrap Serial Data Serial Clock Linear Compensation Linear Feedback Linear Regulator 34702 Analog Integrated Circuit Device Data Freescale Semiconductor 3 PIN CONNECTIONS Table 1. Pin Function Des.


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