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参数资料
| 型号： | MAX1675EUA-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12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： | 2,500 |
| 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： | 220mA |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
Selecting the Output Voltage
V OUT can be set to 3.3V or 5.0V by connecting the FB
pin to GND (5V) or OUT (3.3V) (Figures 5 and 6).
To adjust the output voltage, connect a resistor-divider
from V OUT to FB to GND (Figure 7). Choose a value
less than 260k ? for R6. Use the following equation to
calculate R5:
R5 = R6 [(V OUT / V REF ) - 1]
V IN
47 μ F
22 μ H
where V REF = +1.3V and V OUT may range from 2V to
5V. The input bias current of FB has a maximum value
of 50nA which allows large-value resistors (R6 ≤ 260k ? )
to be used.
Low-Battery Detection
The MAX1674/MAX1675/MAX1676 contain an on-chip
comparator for low-battery detection. If the voltage at
LBI falls below the internal reference voltage (1.30V),
LBO (an open-drain output) sinks current to GND. The
low-battery monitor threshold is set by two resistors, R3
and R4 (Figures 5, 6, and 7). Since the LBI current is
less than 50nA, large resistor values (R4 ≤ 260k ? ) can
be used to minimize loading of the input supply.
Calculate R3 using the following equation:
R3 = R4 [(V TRIP / V REF ) - 1]
R3
R1
200 ?
BATT
(MAX1676)
LBI
LX
OUT
CLSEL
(MAX1676)
FB
0.1 μ F
V OUT
47 μ F
OUTPUT
+3.3V
for V TRIP ≥ 1.3V. V TRIP is the level where the low-battery
detector output goes low, and V REF is the internal
1.30V reference. Connect a pull-up resistor of 100k ? or
greater from LBO to OUT when driving CMOS circuits.
LBO is an open-drain output, and can be pulled as
high as 6V regardless of the voltage at OUT. When LBI
R4
MAX1674
MAX1675
SHDN
R2
100k
is above the threshold, the LBO output is high imped-
ance. If the low-battery comparator is not used, ground
0.1 μ F
REF
MAX1676
GND
LBO
LOW-BATTERY
OUTPUT
V IN
Figure 5. Preset Output Voltage of +3.3V
47 μ F
V IN
22 μ H
R1
200 ?
BATT
(MAX1676)
LX
47 μ F
22 μ H
R3
OUT
OUTPUT
2V to 5.5V
R3
R1
200 ?
BATT
(MAX1676)
LBI
LX
OUT
CLSEL
(MAX1676)
SHDN
0.1 μ F
OUTPUT
5.0V
47 μ F
R4
LBI
SHDN
CLSEL
(MAX1676)
MAX1674
MAX1675 LBO
MAX1676
R2
100k
0.1 μ F
R5
47 μ F
LOW-
BATTERY
OUTPUT
R4
REF
MAX1674
MAX1675
MAX1676
LBO
FB
R2
100k
LOW-
BATTERY
OUTPUT
0.1 μ F
REF
GND
FB
R6
0.1 μ F
GND
Figure 6. Preset Output Voltage of +5V
Maxim Integrated
Figure 7. Setting an Adjustable Output
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1676EUB | 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 |
| MAX1676EUB+ | 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 |
| MAX1676EUB+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 |
| MAX1676EUB-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 |
| MAX1676EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1676 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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