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参数资料
| 型号： | MAX1543ETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV TFT-LCD 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 控制器，TFT LCD |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 2 |
| 输出电压： | 2.6 V ~ 13 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 管件 |
TFT LCD DC-to-DC Converter with
Operational Amplifiers
60
POSITIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. V MAIN
-0
NEGATIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. V MAIN
50
V D = 0.3V TO 1V
3-STAGE CHARGE-PUMP
-5
1-STAGE
CHARGE-PUMP
-10
40
-15
30
20
2-STAGE CHARGE-PUMP
-20
-25
-30
-35
2-STAGE
CHARGE-PUMP
3-STAGE
CHARGE-PUMP
10
0
1-STAGE CHARGE-PUMP
-40
-45
V D = 0.3V TO 1V
2
4
6
8
10
12
14
2
4
6
8
10
12
14
V MAIN (V)
Figure 5. Positive Charge-Pump Output Voltage vs. V MAIN
negative charge-pump output voltages for a given
V MAIN for one-, two-, and three-stage charge pumps,
based on the following equations:
G _ ON = V MAIN + n ( V MAIN ? V D )
G _ OFF = ? n ( V MAIN ? V D )
where G_ON is the positive charge-pump output volt-
age, G_OFF is the negative charge-pump output volt-
age, n is the number of charge-pump stages, and V D is
V MAIN (V)
Figure 6. Negative Charge-Pump Output Voltage vs. V MAIN
ing greater than 8V. The flying capacitor in the second
stage (C4) requires a voltage rating greater than 16V.
Charge-Pump Output Capacitor
Increasing the output capacitance or decreasing the
ESR reduces the output ripple voltage and the peak-to-
peak transient voltage. With ceramic capacitors, the
output voltage ripple is dominated by the capacitance
value. Use the following equation to approximate the
required capacitor value:
the voltage drop across each diode.
V D is the forward voltage drop of the charge-pump
diodes.
C OUT ≥
I LOAD
2 × F OSC × V RIPPLE
Flying Capacitors
Increasing the flying capacitor (C3, C4, and C5) value
increases the output current capability. Increasing the
capacitance indefinitely has a negligible effect on out-
put current capability because the internal switch resis-
tance and the diode impedance limit the source
impedance. A 0.1μF ceramic capacitor works well in
most low-current applications. The flying capacitor ’ s
voltage rating must exceed the following:
V CX > n ? V MAIN
Where n is the stage number in which the flying capaci-
tor appears, and V MAIN is the main output voltage. For
example, the two-stage positive charge pump in the
Typical Application Circuits (Figures 1 and 2) where
V MAIN = 8V contains two flying capacitors. The flying
capacitor in the first stage (C5) requires a voltage rat-
where V RIPPLE is the acceptable peak-to-peak output-
voltage ripple.
Charge-Pump Rectifier Diodes
To maximize the available output voltage, use Schottky
diodes with a current rating equal to or greater than two
times the average charge-pump input current. If the
loaded charge-pump output voltage is greater than
required, some or all of the Schottky diodes can be
replaced with low-cost silicon switching diodes with an
equivalent current rating. The charge-pump input cur-
rent is:
I CP _ IN = I CP _ OUT × n
where n is the number of charge-pump stages.
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1543ETP+ | 功能描述:LCD 驱动器 TFT LCD DC/DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1543ETP+T | 功能描述:LCD 驱动器 TFT LCD DC/DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1543ETP-T | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1543EVKIT | 功能描述:显示开发工具 MAX1542/3 Eval Kit RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX1544ETL | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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