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| 型号： | MCZ34702EWR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 16/39页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY 3A SW 32-SOIC |
| 标准包装： | 1,000 |
| 应用： | 控制器，电源 QUICC? I、II |
| 输入电压： | 2.8 V ~ 6 V |
| 输出数： | 2 |
| 输出电压： | 7.75V，0.8 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 32-SOIC |
| 包装： | 带卷 (TR) |
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FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 34702 power supply integrated circuit provides the
means to efficiently supply the Freescale Power QUICC and
other families of Freescale microprocessors. It incorporates a
high performance synchronous buck regulator, supplying the
microprocessor’s core, and a low dropout (LDO) linear
regulator providing the microprocessor I/O and bus voltages.
This device incorporates many advanced features; e.g.,
precisely maintained up/down power sequencing, ensuring
the proper operation and protection of the CPU and power
system. At the same time, it provides high flexibility of
configuration, allowing the maximum optimization of the
power supply system.
FUNCTIONAL PIN DESCRIPTION
OSCILLATOR FREQUENCY PIN (FREQ)
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.
BOOTSTRAP PIN (BOOT)
Bootstrap capacitor input.
SERIAL DATA PIN (SDA)
I 2 C bus pin. Serial data.
INVERTING INPUT PIN (INV)
Buck Controller Error Amplifier inverting input.
OUTPUT VOLTAGE PIN (VOUT)
Output voltage of the buck converter. Input pin of the
switching regulator power sequence control circuit.
INPUT VOLTAGE 2 PINS (VIN2)
Buck regulator power input. Drain of the high side power
MOSFET.
SWITCH PINS (SW)
Buck regulator switching node. This pin is connected to the
inductor.
GROUND PINS (GND)
Analog ground of the IC, thermal heatsinking.
POWER GROUND PINS (PGND)
Buck regulator power ground.
BOOST DRAIN PIN (VBD)
Drain of the internal boost regulator power MOSFET.
BOOST VOLTAGE PIN (VBST)
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.
SERIAL CLOCK PIN (SCL)
I 2 C bus pin. Serial clock.
LINEAR COMPENSATION PIN (LCMP)
Linear regulator compensation pin.
LINEAR FEEDBACK PIN (LFB)
Linear regulator feedback pin.
LINEAR REGULATOR PIN (LDO)
Input pin of the linear regulator power sequence control
circuit.
CURRENT SENSE PIN (CS)
Current sense pin of the LDO. Over-current protection of
the linear regulator external power MOSFET. The voltage
drop over the LDO current sense resistor RS is sensed
between the CS and LDO pins. The LDO current limit can be
adjusted by selecting the proper value of the current sensing
resistor RS.
LINEAR DRIVE PIN (LDRV)
LDO gate drive of the external pass N-channel MOSFET.
INPUT VOLTAGE 1 PIN (VIN1)
The input supply pin for the integrated circuit. The internal
circuits of the IC are supplied through this pin.
34702
Analog Integrated Circuit Device Data ?
16
Freescale Semiconductor
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