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| 型号： | MAX1947ETA30+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 3V 0.25A 8TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3V |
| 输入电压： | 0.7 V ~ 3.6 V |
| 频率 - 开关： | 最高 2MHz |
| 电流 - 输出： | 250mA |
| 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-WDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 其它名称： | MAX1947ETA30+TDKR |
Low Input/Output Voltage
Step-Up DC-DC Converter with RESET
Calculate the maximum output current (I OUTMAX ) using
inductor ripple current (I RIPPLE ) and duty cycle (D) as
follows:
Capacitor Selection
The MAX1947 is specifically designed for using small,
inexpensive, low-ESR ceramic capacitors. X5R and
X7R dielectrics are recommended when operating over
wide temperature ranges. Bypass the output of the
L / t OFF +
I RIPPLE =
V OUT + I LIM × ( R DS( ON)PFET + R L ) ? V BATT
2
(R DS( ON)PFET + R L )
MAX1947 with 10μF when using maximum load cur-
rents. When using less than half the maximum load cur-
rent capability, the output capacitor can be reduced to
4.7μF. Bypass the input with a 2.2μF or larger ceramic
capacitor. Table 1 lists the suggested values for the
? V OUT + ( ILIM ?
) ×
?
?
?
V OUT + ( ILIM ? RIPPLE ) ×
?
?
D =
? IRIPPLE ?
2
? ?
? ( RDS ( ON ) PFET + R L ) ? V BATT ?
? ?
? I
2
? ( RDS ( ON ) PFET ? R DS ( ON ) NFET + R L )
? ?
?
?
?
?
? ?
input and output capacitors for typical applications.
PCB Layout and Grounding
Careful PCB layout is important for minimizing ground
bounce and noise. Keep the IC’s GND pins and the
ground leads of the input and output filter capacitors
very close together. Connect GND and PGND directly
to the exposed paddle. In addition, keep all connec-
tions to the OUT and LX pins as short as possible. To
maximize output power and efficiency and minimize
output ripple voltage, use short, wide traces from the
I OUTMAX = ( ILIM ? RIPPLE ) × ( 1 ? D )
I
2
Here, I LIM is the NFET current limit (800mA typ), t OFF is
the LX switch ’s off-time (0.25μs typ), and R L is the
series resistance of the inductor.
input and output. A sample layout is available in the
MAX1947 evaluation kit.
Chip Information
TRANSISTOR COUNT: 5156
PROCESS: BiCMOS
_______________________________________________________________________________________
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1947ETA33 | 制造商:Maxim Integrated Products 功能描述:LOW INPUT/OUTPUT VOLTAGE STEP-UP DC-DC CONVER - Rail/Tube |
| MAX1947ETA33+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 8TDFN EP - Rail/Tube |
| MAX1947ETA33+T | 功能描述:直流/直流开关转换器 Step-Up w/RESET 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 |
| MAX1947ETA33-T | 功能描述:直流/直流开关转换器 Step-Up w/RESET 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 |
| MAX1947EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1947 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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