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| 型号： | MAX1674EUA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC FIX/ADJ 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V，可调 |
| 输入电压： | 0.7 V ~ 5.5 V |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 420mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-uMAX |
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
V IN
V TRIP (V H , V L )
R3
R1
200 ?
BATT
(MAX1676)
LBI
LX
OUT
CLSEL
(MAX1676)
FB
47 μ F
22 μ H
0.1 μ F
V OUT
47 μ F
R3
R4
R7
LBI
MAX1674
MAX1675
MAX1676
GND
OUT
LBO
R2
100k
0.1 μ F
V OUT
47 μ F
SHDN
(
)
V H = 1.3V ? 1 +
(
)
V L = 1.3V ? 1 +
R 4 ?
( 1 . 3 V ) ( R 2 + R 7 ) ?
0.1 μ F
MAX1674
MAX1675
REF MAX1676
GND
LBO
R2
100k
LOW-
BATTERY
OUTPUT
R4
?
?
?
?
R 3
R 7
R 3
R 4
+
?
R 3 ?
?
( V OUT ? 1 . 3 V ) R 3 ?
?
WHERE V H IS THE UPPER TRIP LEVEL
V L IS THE LOWER TRIP LEVEL
Figure 8. Setting Resistor Values for the Low-Battery Indicator
when V IN < 1.3V
LBI and LBO . For V TRIP less than 1.3V, configure the
comparator as shown in Figure 8. Calculate the value of
the external resistors R3 and R4 as follows:
R3 = R4(V REF - V TRIP ) / (V OUT - V REF )
Since the low-battery comparator is noninverting, exter-
nal hysteresis can be added by connecting a resistor
between LBO and LBI as shown in Figure 9. When LBO
is high, the series combination of R2 and R7 source
current into the LBI summing junction.
Applications Information
Figure 9. Adding External Hysteresis to the Low-Battery
Indicator
MAX1674, 500mA for the MAX1675, and 1A or 0.5A for
the MAX1676. However, it is generally acceptable to
bias the inductor into saturation by as much as 20%,
although this will slightly reduce efficiency. Table 1 lists
suggested components.
The inductor’s DC resistance significantly affects effi-
ciency. See Table 2 for a comparison of inductor speci-
fications. Calculate the maximum output current as
follows:
( )
? ? ?
V OUT ? ?
? I LIM – t OFF ? OUT IN ? ? η
Inductor Selection
An inductor value of 22μH performs well in most appli-
cations. The MAX1674/MAX1675/MAX1676 will also
I OUT MAX
=
? 2 x L
V IN ? ? V – V ? ?
work with inductors in the 10μH to 47μH range. Smaller
inductance values typically offer a smaller physical size
for a given series resistance, allowing the smallest
overall circuit dimensions. However, due to higher peak
inductor currents, the output voltage ripple (I PEAK x
output filter capacitor ESR) also tends to be higher.
Circuits using larger inductance values exhibit higher
output current capability and larger physical dimen-
sions for a given series resistance. The inductor’s incre-
mental saturation current rating should be greater than
the peak switch-current limit, which is 1A for the
10
where I OUT(MAX) = maximum output current in amps
V IN = input voltage
L = inductor value in μH
η = efficiency (typically 0.9)
t OFF = LX switch’s off-time in μs
I LIM = 0.5A or 1.0A
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1674EUA+ | 功能描述:直流/直流开关转换器 Compact Step-Up DC/DC Converter 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 |
| MAX1674EUA+T | 功能描述:直流/直流开关转换器 Compact Step-Up DC/DC Converter 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 |
| MAX1674EUA-T | 功能描述:直流/直流开关转换器 Compact Step-Up DC/DC Converter 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 |
| MAX1674EUA-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1675EUA | 功能描述:直流/直流开关转换器 Compact Step-Up DC/DC Converter 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 |
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