参数资料
| 型号： | MC34703PNB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 18/46页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY QUICC 33-QFN |
| 标准包装： | 1 |
| 应用： | 电源 |
| 电流 - 电源： | 60mA |
| 电源电压： | 2.8 V ~ 13.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 33-PowerQFN |
| 供应商设备封装： | 33-PQFN（10x10） |
| 包装： | 管件 |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
7.75V
Booster Output Voltage
Fault Timer
t FAULT = 10 ms
I pk Cu rrent Limit
t FAULT = 10 ms
Ip k
6.0 V
0A
0.5 I pk
Retry Timer
t Ret = 10 0 ms
0.5 Ipk
0V
Ipk = 1 A typ.
Figure 13. Switching Regulator Current Limit
(Not To Scale)
In order to avoid destruction of the supplied circuits, a
current limit with retry capability was implemented in the buck
Booster Inductor Current
0.6 A typ.
0.2 A typ.
0.1 A typ.
Figure 12. Boost Regulator Startup (Not To Scale)
BUCK REGULATOR
The buck regulator is a high-frequency (300 kHz default,
adjustable in the range from 200 kHz to 400 kHz),
synchronous buck converter driving integrated high-side and
low-side N-channel power MOSFETs. The buck regulator
regulator. When an overcurrent 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 overcurrent condition exists for 10 ms, the
buck regulator control circuit shuts the switcher OFF and the
switcher retry timer starts to time out. When the timer expires
after 100 ms, the switcher engages the start-up sequence
and runs for 10 ms, repeatedly checking for the overcurrent
condition. During the current limited operation (e.g., in case
of short circuit on the buck regulator output), the buck
regulator operation is not synchronized to the oscillator
frequency.
The buck regulator output voltage can be adjusted from
0.8 V to 5.0 V. Power-up, power-down, and fault
management are coordinated with the linear regulator.
output voltage is adjustable by means of an external resistor
divider to provide the required output voltage. Its high current
ouput is well suited for directly powering the core of the
microprocessor.
A typical bootstrap technique is used to provide the
voltage necessary to properly enhance the high-side
MOSFET gate. However, when the regulator is supplied from
a low-input voltage (e.g., a +3.3 V supply rail), the bootstrap
capacitor is charged from the internal boost regulator output
V BST through an external diode. This arrangement allows the
34703 to operate efficiently even from a very low input
voltage source.
Figure 14. Buck Converter Overcurrent Protection
34703
Analog Integrated Circuit Device Data
18
Freescale Semiconductor
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| MC34704AEP | 功能描述:开关变换器、稳压器与控制器 DSC8 PASS.1.3 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 |
| MC34704AEPR2 | 功能描述:开关变换器、稳压器与控制器 DSC8 PASS1.3 TAPE 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 |
| MC34704BEP | 功能描述:开关变换器、稳压器与控制器 5CH DC-DC PWR MANGMNET I 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 |
| MC34704BEPR2 | 功能描述:开关变换器、稳压器与控制器 5CH DC-DC PWR MANGMNET 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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