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| 型号： | MAX770CSA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 300kHz |
| 占空比： | 90% |
| 电源电压： | 3 V ~ 16.5 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1409 (CN2011-ZH PDF) |
5V/12V/15V or Adjustable, High-Efficiency,
Low I Q , Step-Up DC-DC Controllers
3.5
3.0
2.5
2.0
V OUT = 5V
L = 22 μ H
R SENSE = 40m ?
R SENSE = 50m ?
R SENSE = 75m ?
3.5
3.0
2.5
2.0
V OUT = 12V
L = 22 μ H
R SENSE = 40m ?
R SENSE = 50m ?
R SENSE = 75m ?
1.5
1.5
1.0
0.5
0
R SENSE = 100m ?
R SENSE = 200m ?
1.0
0.5
0
R SENSE = 100m ?
R SENSE = 200m ?
2
3
4
5
2
4
6
8
10
12
INPUT VOLTAGE (V)
Figure 7a. Maximum Output Current vs. Input Voltage
(V OUT = 5V)
INPUT VOLTAGE (V)
Figure 7b. Maximum Output Current vs. Input Voltage
(V OUT = 12V)
3.5
3.0
2.5
V OUT = 15V
L = 22 μ H
R SENSE = 40m ?
R SENSE = 50m ?
0.8
0.6
V OUT = 24V
L =150 μ H
2.0
R SENSE = 75m ?
R SENSE = 100m ?
R SENSE = 200m ?
0.4
1.5
1.0
R SENSE = 100m ?
0.2
0.5
0
R SENSE = 200m ?
0
R SENSE = 400m ?
2
4
6
8
10
12
14
16
2
6
10
14
INPUT VOLTAGE (V)
Figure 7c. Maximum Output Current vs. Input Voltage
(V OUT = 15V)
Determining R SENSE
The Typical Operating Characteristics graphs show the
output current capability for various modes, sense
resistors, and input/output voltages. Use these graphs,
along with the theoretical output current curves shown
in Figures 7a-7d, to select R SENSE . These theoretical
curves assume that an external N-FET power switch is
used. They were derived using the minimum (worst-
case) current-limit comparator threshold value, and the
inductance value. No tolerance was included for
R SENSE . The voltage drop across the diode was
assumed to be 0.5V, and the drop across the power
switch r DS(ON) and coil resistance was assumed to be
0.3V. To use the graphs, locate the graph with the
appropriate output voltage or the graph having the
nearest output voltage higher than the desired output
voltage. On this graph, find the curve for the largest
INPUT VOLTAGE (V)
Figure 7d. Maximum Output Current vs. Input Voltage
(V OUT = 24V)
sense-resistor value with an output current that is ade-
quate at the lowest input voltage.
Determining the Inductor (L)
Practical inductor values range from 10μH to 300μH.
20μH is a good choice for most applications. In appli-
cations with large input/output differentials, the IC ’s
output current capability will be much less when the
inductance value is too low, because the IC will always
operate in discontinuous mode. If the inductor value
is too low, the current will ramp up to a high level
before the current-limit comparator can turn off the
switch. The minimum on-time for the switch (t ON (min))
is approximately 2μs; select an inductor that allows
the current to ramp up to I LIM /2 in no less than 2μs.
Choosing a value of I LIM /2 allows the half-size current
pulses to occur, increasing light-load efficiency and
minimizing output ripple.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX770CSA+ | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX770CSA+ | 制造商:Maxim Integrated Products 功能描述:IC STEP-UP DC/DC CONTROLLER 8-SOIC |
| MAX770CSA+T | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX770CSA-T | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX770EPA | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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