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参数资料
| 型号： | MAX1796EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/13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： | 1 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 300mA |
| 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 |
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
V IN
pate this energy, minimizing the ringing at LX.
Damping LX ringing does not reduce V OUT ripple, but
does reduce EMI (Figures 3, 4, and 5).
Setting the Output Voltage
MAX1795
MAX1796
MAX1797
BATT
R1
200 ?
DAMPING
22 μ H
V OUT can be set to 3.3V or 5.0V by connecting the FB
pin to GND (5V) or OUT (3.3V). To adjust the output
voltage, connect a resistive voltage-divider from OUT to
FB to GND (Figure 6). Choose a value less than 250k ?
for R2.
SWITCH
LX
OUT
V OUT
47 μ F
BATT
47 μ F
LX
V IN
Figure 3. Simplified Diagram of Inductor Damping Switch
R3
LBI
OUT
SHDN
1M
OUTPUT
2V TO 5.5V
47 μ F
R4
MAX1795
MAX1796
R1
MAX1797
GND
LBO
FB
LOW-BATTERY
OUTPUT
R2
V LX
1V/div
2 μ s/div
Figure 4. LX Ringing for Conventional Step-Up Converter
(without Damping Switch)
V LX
1V/div
2 μ s/div
Figure 5. LX Waveform with Damping Switch
Figure 6. Setting an Adjustable Output
Use the following equation to calculate R1:
R1 = R2 [(V OUT / V FB ) - 1]
where V FB = +1.245V, and V OUT may range from +2V
to +5.5V.
Low-Battery Detection
The MAX1795/MAX1796/MAX1797 each contain an on-
chip comparator for low-battery detection. If the voltage
at LBI is above 0.85V, LBO (an open-drain output)
sinks current to GND. If the voltage at LBI is below
0.85V, LBO goes high impedance. The LBI/LBO func-
tion remains active even when the part is in shutdown.
Connect a resistive voltage-divider to LBI from BATT to
GND. The low-battery monitor threshold is set by two
resistors, R3 and R4 (Figure 6). Since the LBI bias cur-
rent is typically 2nA, large resistor values (R4 up to
250k ? ) can be used to minimize loading of the input
supply.
Calculate R3 using the following equation:
R3 = R4[(V TRIP / 0.85V) - 1]
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1797EUA | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv 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 |
| MAX1797EUA+ | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv 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 |
| MAX1797EUA+ | 制造商:Maxim Integrated Products 功能描述:IC STEP-UP DC/DC CONVERTER MAX-8 |
| MAX1797EUA+T | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv 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 |
| MAX1797EUA-T | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv 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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