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参数资料
| 型号： | MAX651ESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK 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： | 4 V ~ 16.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I Q , Step-Down DC-DC Controllers
1.5A
1A
0A
2 μ s/div
V+ = 10V, I LOAD = 1.3A
CIRCUIT OF FIGURE 1, R1 = 150m ?
Figure 3a. MAX649 Continuous-Conduction Mode, Heavy
Load-Current Waveform (500mA/div)
inductor, and the control circuit adjusts the switch duty
cycle to maintain regulation without exceeding the
2.5A
2.0A
1.5A
1.0A
0.5A
0A
5 μ s/div
V+ = 10V, I LOAD = 1.4A
CIRCUIT OF FIGURE 1, R1 = 100m ?
Figure 3b. MAX649 Light/Medium Load-Current Waveform
(500mA/div)
V IN
switch current capability (Figure 3a). This provides
excellent load-transient response and high efficiency.
V+
5
C4
0.1 μ F
C1
100 μ F
In discontinuous-conduction mode (DCM), current
through the inductor starts at zero, rises to a peak
value, then ramps down to zero. Although efficiency is
still excellent, the output ripple increases slightly, and
the switch waveforms exhibit ringing (the self-resonant
frequency of the inductor). This ringing is to be expect-
3
SHDN
MAX649
MAX651
MAX652
CS
EXT
6
7
R1
0.1 ?
P1
Si9430
L1
22 μ H
OUTPUT
@ 1.5A
ed and poses no operational problems.
4
REF
OUT
1
Dropout
The MAX649/MAX651/MAX652 are said to be in
dropout when the input voltage (V+) is low enough
that the output drops below the minimum output
voltage specification (see Electrical Characteristics ).
C3
0.1 μ F
GND
8
FB
2
R2
C2
330 μ F
The dropout voltage is the difference between the
input and output voltage when dropout occurs.
See the Typical Operating Characteristics for the
R2 = R3
(
V OUT
V REF
–1
)
D1
1N5820
R3
150k
Dropout Voltage vs. Load Current and Dropout Voltage
vs. Temperature graphs.
V REF = 1.5V
Figure 4. Adjustable-Output Operation
_______________________________________________________________________________________
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX651ESA+ | 功能描述:DC/DC 开关控制器 5V/3.3V/3V or Adj Low-IQ Step-Down 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 |
| MAX651ESA+T | 功能描述:DC/DC 开关控制器 5V/3.3V/3V or Adj Low-IQ Step-Down 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 |
| MAX651ESA-T | 功能描述:DC/DC 开关控制器 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 |
| MAX651MJA | 功能描述:DC/DC 开关控制器 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 |
| MAX651MJA+ | 功能描述:DC/DC 开关控制器 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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