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| 型号： | MAX629ESA-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG +/-28V 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相，回扫，Sepic |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | ±28V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
28V, Low-Power, High-Voltage,
Boost or Inverting DC-DC Converter
V OUT
R1
R B
limit threshold. Resistor R3 increases the usable input
voltage range by limiting the peak injected current. The
2 ? resistor shown provides a usable input voltage
range beyond V IN = 15V. In applications with a different
input voltage range, R3 may be increased or
FB
MAX629
GND
(REF)
( ) ARE FOR NEGATIVE OUTPUT VOLTAGE CONFIGURATIONS.
Figure 4. Adjustable Output Voltage
R2
V BIAS
decreased as necessary, with a resulting efficiency
change of roughly 0.5%/ ? .
Layout Considerations
Proper PC board layout is essential due to high current
levels and fast switching waveforms that radiate noise.
It is recommended that initial prototyping be performed
using the MAX629 evaluation kit or equivalent PC
board-based design. Breadboards or proto-boards
should never be used when prototyping switching reg-
ulators.
increasing usable battery life. Using separate supplies
for V CC and V IN also reduces noise injection onto V CC
by isolating it from the switching transients, allowing a
smaller, less-expensive input filter capacitor to be used
in many applications. If input voltages below 2V will be
common, reducing the inductor to 22μH may improve
performance in this voltage range, at the potential cost
of some decrease in maximum load current and effi-
ciency.
In the negative configuration shown in Figure 3, the
inverting charge pump injects current into LX with each
cycle. The amount of charge injected increases at
higher V IN , and may prematurely trip the internal current-
It is important to connect the GND pin, the input
bypass-capacitor ground lead, and the output filter-
capacitor ground lead to a single point (star ground
configuration) to minimize ground noise and improve
regulation. Also, minimize lead lengths to reduce stray
capacitance, trace resistance, and radiated noise, with
preference given to the feedback circuit, the ground
circuit, and LX. Place R1 and R2 as close to the feed-
back pin as possible. Place the input bypass capacitor
as close as possible to V CC and GND.
Refer to the MAX629 evaluation kit data sheet for an
example of proper board layout.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX629ESA-TG068 | 制造商:Maxim Integrated Products 功能描述:28V, LOW-POWER, HIGH-VOLTAGE BOOST OR INVERTI - Tape and Reel |
| MAX629EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX629 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX63___R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual/Triple-Voltage ??P Supervisory Circuits |
| MAX63___S | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual/Triple-Voltage ??P Supervisory Circuits |
| MAX63___T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual/Triple-Voltage ??P Supervisory Circuits |
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