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| 型号： | MC34701EK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 19/39页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY MCU 1A 32-SOIC |
| 标准包装： | 42 |
| 应用： | 转换器，Freescale 电源 QUICC? I，II |
| 输入电压： | 2.8 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 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： | 管件 |
| 配用： | KIT33701DWBEVB-ND - KIT FOR 33701 POWER SUPPLY |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
6.0 V
7.75V
Booster Output Voltage
Fault Timer
t FAULT = 10 ms
I pk Cu rrent Limit
0.5 I pk
t FAULT = 10 ms
Ip k
0.5 Ipk
Retry Timer
t Ret = 10 0 ms
0A
0V
Ipk = 1 A typ.
Booster Inductor Current
0 .6 A typ.
0.2 A typ.
0.1 A typ.
Figure 12. Boost Regulator Startup (Not To Scale)
SWITCHING REGULATOR
The switching regulator is a high frequency (300kHz
default, adjustable in the range from 200kHz to 400kHz),
synchronous buck converter driving integrated high side and
low side N-channel power MOSFETs. The switching
regulator output voltage is adjustable by means of an external
resistor divider to provide the required output voltage within
±2.0% accuracy, and is intended to directly power the core of
the microprocessor. The buck controller uses a PWM voltage
mode control topology with feed-forward to achieve excellent
line and load regulation.
The 34702 integrated boost regulator provides a 7.75V rail
which is used to properly bias the switcher’s MOSFET. In
addition, the boost structure has a very low start-up voltage
(Typically 1.6V), hence ensuring very low input voltage
functionality. A typical bootstrap technique is used to provide
voltage necessary to properly enhance the high side
MOSFET gate. When the regulator is supplied only from low
input voltage (e.g., single +3.3V supply rail), the bootstrap
capacitor is charged from the internal boost regulator output
V BST through an external diode. This arrangement allows
the 34701 to operate from very low input voltage and also
comply with the power sequencing requirements of the
supplied microcontroller.
Figure 13. Switching Regulator Current Limit
(Not To Scale)
To avoid destruction of the supplied circuits, the switching
regulator has a current limit with retry capability. When an
over-current condition occurs and the switch current reaches
the peak current limit value, the main (high side) switch is
turned off until the inductor current decays to the valley value,
which is one half of the peak current limit. If an over-current
condition exists for 10ms, the buck regulator control circuit
shuts the switcher OFF and the switcher retry timer starts to
time out. When the timer expires after 100ms, the switcher
engages the start-up sequence and runs for 10ms,
repeatedly checking for the over-current condition. Figure 13
describes the switching regulator over-current condition and
current limit. During the current limited operation (e.g., in
case of short-circuit on the switching regulator output), the
switching regulator operation is not synchronized to the
depicts the current limit with a retry capability feature of the
switcher (respectively LDO).
Figure 14. Switching Converter Over-current Protection
34701
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34701EKR2 | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY1 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34702EK | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY2 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34702EKR2 | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY2 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34703 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 7WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 7WAY |
| MC34703PNB | 功能描述:开关变换器、稳压器与控制器 QUICC SUPPLY 3 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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