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| 型号： | MAX686EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV +/-27.5V 16QSOP |
| 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 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | ±27.5V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 100mA |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
V CC to the source through a 100 ? resistor (R8), and
V IN = 2.7V
22 μ H
MBR0530L
V OUT
bypass V CC with a 1μF ceramic capacitor as shown in
Figure 8. Since the supply current is very small, the
TO 5.5V
voltage drop across R8 is insignificant and does not
15 μ F
R2
C F
degrade performance. The RC isolates V CC from the
switching noise created by the inductor and internal
power switch.
V DD
LX
Although, in many cases, the MAX686 and the inductor
R8
100 ?
MAX686
R3
are powered from the same source, it is often advanta-
geous in battery-powered applications to power the
1 μ F
V CC
DACOUT
FB
MAX686 IC (V CC, V DD ) from an available regulated sup-
ply and to power the inductor (V IN ) directly from a bat-
tery. The MAX686 requires a +2.7V to +5.5V supply at
V CC , but the inductor can be powered from voltages as
low as 0.8V, significantly increasing usable battery life.
R1
Layout Considerations
Proper PC board layout is essential due to high current
levels and fast switching waveforms that radiate noise.
Figure 8. Using a Common Supply-Voltage Source
R6 turns it off when LCDON goes high. R6 and R7 can
be the same value. Choose R7 such that the minimum
base current is greater than 1/50 of the collector current.
For example, assume V OUT(MIN) = 12.5V and I LCD =
10mA and then determine R7 as follows:
R7 ≤ 50 x (12.5 - 0.7) / 10mA = 59k ?
Remember that the LCD voltage, V OUTSW , is the regu-
lated output voltage minus the drop across the PNP
switch (300mV typ).
Connecting V IN to V CC
The MAX686 (V CC , V DD ) and the inductor (V IN ) can be
powered from the same source as long as the +5.5V
V CC maximum limit is not violated. To ensure stability,
connect V IN and V DD directly to the source, connect
It is recommended that initial prototyping be performed
using the MAX686 evaluation kit or equivalent PC
board-based design. Breadboards or proto-boards
should never be used when prototyping switching regu-
lators.
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 resis-
tance, and radiated noise, with preference given to the
feedback circuit, the ground circuit, and LX. Place R1
and R2 as close to the feedback pin as possible. Place
the bypass capacitors as close to the pins as possible.
Refer to the MAX686 evaluation kit data sheet for an
example of proper board layout.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX686EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX686 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 |
| MAX6870ETJ | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6870ETJ+ | 功能描述:监控电路 EEPROM-Prog Hex Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6870ETJ+T | 功能描述:监控电路 EEPROM-Prog Hex Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6870ETJ-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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