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参数资料
| 型号： | MAX748ACWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 0.5A 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 3.3 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC W |
3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
MAX763A 3.3V TO 11.0V IN
INPUT
MAX748A 3.3V TO 16.0V V
8
C2
1.0 μ F
C3
150 μ F
1
SHDN
V+
LX
7
D1
1N5817
L1
22 μ H
OPTIONAL 21kHz LOWPASS OUTPUT FILTER
3
SS
MAX748A
MAX763A
OUT
CC
5
4
C5
330pF
OUTPUT
3.3V
C4
150 μ F
OUTPUT
L2
25 μ H
C7
2.2 μ F
FILTER
OUTPUT
C1
0.047 μ F
GND
REF
6
2
C6
1000pF
Figure 3. Standard 3.3V Step-Down Application Circuit Using Through-Hole Components (commercial temperture range)
Table 2. Component Table for
Wide Temperature Applications
C1(μF) C2(μF) C3(μF) C4(μF) C5(pF) C6(pF) L1(μH)
input voltages of 4.75V to 16V with 800mA typical out-
put currents. The MAX763A delivers a guaranteed
300mA for input voltages of 4V to 11V, a guaranteed
500mA for input voltages of 4.75V to 11V, and has
Through-
Hole 0.047
1.0
150*
220*
330
1000
22
700mA typical output currents. The MAX748A/
MAX763A operate from an input down to 3V (the upper
SO 0.047 1.0 68** 100***
* Sanyo OS-CON Series (very low ESR)
330
1000
22
limit of undervoltage lockout), but with some reduction
in output voltage and maximum output current.
** 16V or greater maximum voltage rating.
*** 6.3V or greater maximum voltage rating.
____________Applications Information
Fixed +3.3V Step-Down
Converter Application
Figure 3 shows the standard 3.3V step-down circuit with
components shown for commercial temperature range
applications. Figures 4, 5, and Table 2 suggest external
component values for both SO and through-hole wide
temperature range applications. These circuits are use-
ful in systems that require high current and high efficien-
cy and are powered by an unregulated supply, such as
a battery or wall-plug AC-DC adapter.
The MAX748A delivers a guaranteed 300mA for input
voltages of 4V to 16V, and a guaranteed 500mA for
Inductor Selection
The MAX748A/MAX763A require no inductor design
because they are tested in-circuit, and are guaranteed
to deliver the power specified in the Electrical
Characteristics with high efficiency using a single
22μH inductor. The 22μH inductor’s incremental satu-
ration current rating should be greater than 1A for
500mA load operation. Table 3 lists inductor types and
suppliers for various applications. The surface-mount
inductors have nearly equivalent efficiencies to the
larger through-hole inductors.
Output Filter Capacitor Selection
The primary criterion for selecting the output filter
capacitor is low effective series resistance (ESR). The
product of the inductor-current variation and the output
capacitor’s ESR determines the amplitude of the saw-
tooth ripple seen on the output voltage. Minimize the
output filter capacitor’s ESR to maintain AC stability.
_______________________________________________________________________________________
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相关代理商/技术参数 |
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|---|---|
| MAX748AEPA | 功能描述:直流/直流开关转换器 3.3V Step-Down 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 |
| MAX748AEPA+ | 功能描述:直流/直流开关转换器 3.3V Step-Down 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 |
| MAX748AEWE | 功能描述:直流/直流开关转换器 3.3V Step-Down 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 |
| MAX748AEWE+ | 功能描述:直流/直流开关转换器 3.3V Step-Down 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 |
| MAX748AEWE+T | 功能描述:直流/直流开关转换器 3.3V Step-Down 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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