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参数资料
| 型号： | MAX17062ETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC TFT-LCD DC/DC CONV 10-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 应用： | LCD 显示器 |
| 电流 - 电源： | 1.5mA |
| 电源电压： | 2.6 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX17062ETB+TDKR |
TFT-LCD Step-Up DC-DC Converter
AC characteristics of the inductor core material and the
ratio of inductor resistance to other power-path resis-
tances, the best LIR can shift up or down. If the induc-
tor resistance is relatively high, more ripple can be
accepted to reduce the number of turns required and
increase the wire diameter. If the inductor resistance is
relatively low, increasing inductance to lower the peak
current can decrease losses throughout the power
path. If extremely thin high-resistance inductors are
used, as is common for LCD panel applications, the
best LIR can increase to between 0.5 and 1.0.
The inductor ’s saturation current rating and the
MAX17062 ’s LX current limit (I LIM ) should exceed
I PEAK , and the inductor ’s DC current rating should
exceed I IN(DC,MAX) . For good efficiency, choose an
inductor with less than 0.1 Ω series resistance.
Considering the typical operating circuit (Figure 1), the
maximum load current (I MAIN(MAX) ) is 600mA with a
15V output and a typical input voltage of 5V. Choosing
an LIR of 0.5 and estimating efficiency of 85% at this
operating point:
15 V ? 5 V
? 5 V ? ?
? ? 0 . 85 ?
? 15 V ? ? ? ? 0 . 6 A × 1 . 2 MHz ? ? ? ? 0 . 50 ? ?
Once a physical inductor is chosen, higher and lower
values of the inductor should be evaluated for efficien-
cy improvements in typical operating regions.
L = ?
2
≈ 2 . 7 μ H
I IN ( DC , MAX ) =
≈ 2 . 35 A
? ? η
? V
? 2 ? ?
? ? TYP ?
L = ?
IN V MAIN ? V IN
? I
?
I RIPPLE =
≈ 0 . 97 A
Calculate the approximate inductor value using the typ-
ical input voltage (V IN ), the maximum output current
(I MAIN(MAX) ), the expected efficiency ( η TYP ) taken from
an appropriate curve in the Typical Operating
Characteristics, and an estimate of LIR based on the
above discussion:
? ?
? V MAIN ? ? MAIN ( MAX ) × f OSC ? ? LIR ?
Choose an available inductor value from an appropriate
inductor family. Calculate the maximum DC input cur-
Using the circuit’s minimum input voltage (4.5V) and
estimating efficiency of 85% at that operating point:
0.6 A × 15 V
4 . 5 V × 0 . 85
The ripple current and the peak current are:
4 . 5 V × ( 15 V ? 4 . 5 V )
2 . 7 μ H × 15 V × 1 . 2 MHz
rent at the minimum input voltage V IN(MIN) using con-
servation of energy and the expected efficiency at that
operating point ( η MIN ) taken from an appropriate curve
I PEAK = 2 . 35 A +
0 . 97 A
2
≈ 2 . 84 A
in the Typical Operating Characteristics:
I MAIN(MAX) × V MAIN
I IN ( DC , MAX ) =
V IN ( MIN ) × η MIN
Calculate the ripple current at that operating point and
the peak current required for the inductor:
Output Capacitor Selection
The total output-voltage ripple has two components: the
capacitive ripple caused by the charging and discharg-
ing of the output capacitance, and the ohmic ripple due
to the capacitor’s equivalent series resistance (ESR):
V RIPPLE = V RIPPLE ( C ) + V RIPPLE ( ESR )
V RIPPLE ( C ) ≈ MAIN ? MAIN IN ?
I RIPPLE =
V IN ( MIN ) × ( V MAIN ? V IN ( MIN ) )
L × V MAIN × f OSC
I ? V ? V ?
C OUT ? V MAIN f OSC ?
I PEAK IN ( DC , MAX ) + RIPPLE
= I
V R IPPLE ( ESR ) ≈ I PEAK R ESR ( COUT )
I
2
and:
where I PEAK is the peak inductor current (see the
Inductor Selection section). For ceramic capacitors,
the output-voltage ripple is typically dominated by
V RIPPLE(C) . The voltage rating and temperature charac-
teristics of the output capacitor must also be considered.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17062EVKIT | 功能描述:电源管理IC开发工具 MAX17062 Eval 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 |
| MAX17062EVKIT+ | 功能描述:电源管理IC开发工具 MAX17062 Eval 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 |
| MAX17065ETI+ | 功能描述:直流/直流开关转换器 TFT-LCD Step-Up 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 |
| MAX17065ETI+T | 功能描述:直流/直流开关转换器 TFT-LCD Step-Up 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 |
| MAX17065EVKIT+ | 功能描述:电源管理IC开发工具 MAX17065 Eval 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 |
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