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| 型号： | MC34704BEPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 20/54页 |
| 文件大小： | 0K |
| 描述： | IC PWR MNGMT DC-DC MULT 56-QFN |
| 特色产品： | MC34704 Multi-channel Power Management IC (PMIC) |
| 标准包装： | 1 |
| 应用： | 处理器 |
| 电流 - 电源： | 86mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-VFQFN 裸露焊盘 |
| 供应商设备封装： | 56-QFN-EP（7x7） |
| 包装： | 标准包装 |
| 产品目录页面： | 809 (CN2011-ZH PDF) |
| 其它名称： | MC34704BEPR2DKR |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
*
Figure 4. MC34704 Functional Internal Block Diagram
INTERNAL BIAS CIRCUIT
Gate Driver Voltage (VG)
REG1/VG is the main regulator of the 34704 IC and will be
used to supply internal circuitry and voltage biases through
the VG output. It also provides the gate drive voltage for the
rest of the regulators and itself.
how REG1 is a critical part of powering up the 34704. Based
on this, REG1 will need extra circuitry to help it boot up until
its output voltage is high enough that it can supply internal
circuitry for the main control loop to take over.
REG1 VG starts up in peak current detect PFM mode and
REG1 VG output starts rising. When the appropriate internal
circuitry is alive and the switching frequency F SW1 is
selected, the PWM control of REG1 can take over.
VREF Generator - Internal Reference
Each one of the regulators in the 34704 uses a DAC which
is controlled by the I 2 C interface to generate a dynamic VREF
voltage for setting the output voltage on each regulator.
VDDI Reference Voltage
The 34704 uses the internal VG voltage to provide a
precise low current 2.5 V voltage that is meant to serve as
reference voltage to derive the FREQ and SS voltage needed
to set the switching frequency 1 (FSW1) and the soft start,
respectively.
FAULT DETECTION AND PROTECTION
Thermal Limit Detection
There is a thermal sensor for each regulator except REG7.
All regulators of the corresponding group will shutdown if at
least one of them reaches the thermal limit. If either REG2,
REG3 or REG4 reaches its thermal limit, the whole part will
shutdown immediately.
Over-Current & Short Circuit Monitoring
The current limit circuitry has two levels of current limiting:
? A soft over-current limit (over-current limit): If the peak
current reaches the typical over-current limit, the switcher
will start a cycle-by-cycle operation to limit the current and
a 10 ms current limit timer starts. The switcher will stay in
this mode of operation until the part regains normal
34704
Analog Integrated Circuit Device Data
20
Freescale Semiconductor
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