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| 型号： | MAX8664AEEP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/26页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR DUAL OUT 20-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源 |
| 电流 - 电源： | 1.4mA |
| 电源电压： | 4.5 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-QSOP |
| 包装： | 带卷 (TR) |
Low-Cost, Dual-Output, Step-Down
Controller with Fast Transient Response
EXTERNAL
CHIP
ENABLE
OUT2
ENABLE
V OUT1
V OUT2
OFF
ON
OUT2
ENABLE
ON
V CC
REF
REFIN2
MAX8664
OSC/EN12
PWRGD
OFF
CHIP
ENABLE
Figure 6d. Sequencing Startup and Shutdown Waveforms with System Enable 2 Signal
Design Procedure
Setting the Switching Frequency
Connect a resistor from OSC/EN12 to GND to set the
switching frequency between 100kHz and 1000kHz.
Calculate the resistor value (R10 in Figures 2–5) as follows:
inductor value is not critical and can be adjusted to make
trade-offs among size, cost, and efficiency. Lower induc-
tor values minimize size and cost, but they also increase
the output ripple and reduce the efficiency due to higher
peak currents. On the other hand, higher inductor values
increase efficiency, but eventually resistive losses due to
R 10 =
2.24 × 10 10 (Hz)
f S
( Ω )
extra turns of wire exceed the benefit gained from lower
AC current levels. This is especially true if the inductance
is increased without also increasing the physical size of
the inductor. Find a low-loss inductor having the lowest
Inductor Selection
There are several parameters that must be examined
when determining which inductor is to be used. Input
possible DC resistance that fits the allotted dimensions.
The chosen inductor’s saturation current rating must
exceed the peak inductor current determined as:
voltage, output voltage, load current, switching fre-
quency, and LIR. LIR is the ratio of inductor-current rip-
ple to maximum DC load current (I LOAD(MAX) ). A higher
I PEAK = I LOAD ( MAX ) +
LIR
2
× I LOAD ( MAX )
LIR value allows for a smaller inductor, but results in
higher losses and higher output ripple. A good compro-
mise between size and efficiency is an LIR of 0.3. Once
all the parameters are chosen, the inductor value is
determined as follows:
Output Capacitor
The key selection parameters for the output capacitor
are the actual capacitance value, the equivalent series
resistance (ESR), the equivalent series inductance
(ESL), and the voltage-rating requirements. These
parameters affect the overall stability, output voltage
L =
V OUT × ( V IN ? V OUT )
V IN × f S × I LOAD ( MAX ) × LIR
ripple, and transient response. The output ripple has
three components: variations in the charge stored in
the output capacitor, the voltage drop across the
where f S is the switching frequency. Choose a standard
value inductor close to the calculated value. The exact
capacitor’s ESR, and ESL caused by the current into
and out of the capacitor. The maximum output voltage
ripple is estimated as follows:
20
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相关代理商/技术参数 |
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|---|---|
| MAX8664BEEP+ | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down 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 |
| MAX8664BEEP+T | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down 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 |
| MAX8664EVKIT+ | 功能描述:电源管理IC开发工具 MAX8664 Evan Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8667ETEAA+ | 功能描述:直流/直流开关转换器 1.5MHz Dl 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 |
| MAX8667ETEAA+T | 功能描述:直流/直流开关转换器 1.5MHz Dl 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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