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参数资料
| 型号： | MC34704BEPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 17/54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 PIN DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
REG5 BOOST STAGE BOOTSTRAP CAPACITOR
INPUT PIN (BT5U)
Connect a 1.0 μ F capacitor between this pin and SW5U
REG3 SWITCHING NODE (SW3)
The inductor is connected between this pin and the
regulated REG3 output.
pin to enhance the gate of the Switch Power MOSFET.
REG3 OUTPUT VOLTAGE RETURN PIN (VOUT3)
REG4 BUCK STAGE BOOTSTRAP CAPACITOR
INPUT PIN (BT4D)
Connect a 0.01 μ F capacitor between this pin and SW4D
pin to enhance the gate of the Switch Power MOSFET.
This is the discharge path of REG3 output voltage.
REG3 VOLTAGE FEEDBACK INPUT FOR
VOLTAGE REGULATION/PROGRAMMING (FB3)
Connect the feedback resistor divider to this pin.
REG4 POWER SUPPLY INPUT VOLTAGE (PVIN4)
This is the connection to the drain of the high side switch
FET. Input decoupling /filtering is required for proper REG4
operation.
SOFT START TIME (SS)
The soft start time for all regulators can be adjusted by
connecting this pin to an external resistor divider between
VDDI and AGND pins.
REG4 BUCK STAGE SWITCHING NODE (SW4D)
The inductor is connected between this pin and the SW4U
pin.
REG4 REGULATED OUTPUT VOLTAGE PIN
(VOUT4)
Connect this pin to the load and to the output filter as close
to the pin as possible.
REG4 BOOST STAGE SWITCHING NODE (SW4U)
The inductor is connected between this pin and the SW4D
pin.
REG4 BOOST STAGE BOOTSTRAP CAPACITOR
INPUT PIN (BT4U)
Connect a 0.01 μ F capacitor between this pin and SW4U
pin to enhance the gate of the Switch Power MOSFET.
REG4 VOLTAGE FEEDBACK INPUT FOR
VOLTAGE REGULATION/PROGRAMMING (FB4)
Connect the feedback resistor divider to this pin.
REG4 COMPENSATION NETWORK CONNECTION
(COMP4)
REG4 compensation network connection.
REG3 BOOTSTRAP CAPACITOR INPUT PIN (BT3)
Connect a 0.01 μ F capacitor between this pin and SW3 pin
OSCILLATOR FREQUENCY (FREQ)
The oscillator frequency can be adjusted by connecting
this pin to an external resistor divider between VDDI and
AGND pins. This pin sets F SW1 value.
REG8 VOLTAGE FEEDBACK INPUT FOR
VOLTAGE REGULATION/PROGRAMMING (FB8)
Connect the feedback resistor divider to this pin, when
voltage mode control is used. When current mode control is
used, connect this pin between the LED string and an I SET
resistor to GND to force the operating current. Refer to
Figure 10 and Figure 11 . Exclude the components not used.
REG8 BOOTSTRAP CAPACITOR INPUT PIN (BT8)
Connect a 0.01 μ F capacitor between this pin and SW8 pin
to enhance the gate of the Synchronous Power MOSFET.
REG8 REGULATED OUTPUT VOLTAGE PIN
(VOUT8)
Connect this pin directly to the load directly and to the
output filter as close to the pin as possible.
REG8 SWITCHING NODE (SW8)
The inductor is connected between this pin and VIN pin.
REG1 SWITCHING NODE (SW1)
The inductor is connected between this pin and VIN pin.
to enhance the gate of the Switch Power MOSFET.
REG1 REGULATED OUTPUT VOLTAGE BEFORE
REG3 POWER SUPPLY INPUT VOLTAGE (PVIN3)
This is the connection to the drain of the high side switch
FET. Input decoupling /filtering is required for proper REG3
THE CUT-OFF SWITCH (VG)
REG1 regulated output voltage before the cutoff switch.
This supplies the internal circuits and the gate drive.
operation.
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
17
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