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参数资料
| 型号： | MAX1513ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/28页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR TFT-LCD PS 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，TFT LCD |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 2.7 V ~ 50 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
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TFT-LCD Power-Supply Controllers
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
-10
1-STAGE
CHARGE-PUMP
40
-15
30
20
10
0
2-STAGE CHARGE-PUMP
1-STAGE CHARGE-PUMP
-20
-25
-30
-35
-40
-45
2-STAGE
CHARGE-PUMP
3-STAGE
CHARGE-PUMP
V D = 0.3V TO 1V
2
4
6
8
10
12
14
2
4
6
8
10
12
14
V MAIN (V)
Figure 13. Positive Charge-Pump Output Voltage vs. VMAIN
Selecting the Number of Charge-Pump Stages
For highest efficiency, always choose the lowest num-
ber of charge-pump stages that meet the output volt-
age requirement. Figures 13 and 14 show the positive
and negative charge-pump output voltages for a given
V MAIN (V)
Figure 14. Negative Charge-Pump Output Voltage vs. VMAIN
Sometimes fractional stages are more desirable for bet-
ter efficiency. This can be done by connecting the first
stage to V IN or another available supply. If the first
charge-pump stage is powered from V IN , then the
above equations become:
V MAIN for one-, two-, and three-stage charge pumps.
The number of positive charge-pump stages is given by:
n POS =
V GON + V DROPOUT - V IN
V MAIN - 2 × V D
n POS =
V GON + V DROPOUT - V MAIN
V MAIN - 2 × V D
n NEG =
- V GOFF + V DROPOUT + V IN
V MAIN - 2 × V D
where n POS is the number of positive charge-pump
stages, V GON is the gate-on linear-regulator REG P out-
put, V MAIN is the main step-up regulator output, V D is
the forward-voltage drop of the charge-pump diode,
and V DROPOUT is the dropout margin for the linear reg-
ulator. Use V DROPOUT = 0.3V.
The number of negative charge-pump stages is given by:
Flying Capacitors
Increasing the flying capacitor (C X ) value lowers the
effective source impedance and increases the output-
current capability. Increasing the capacitance indefinite-
ly has a negligible effect on output-current capability
because the switch resistance and the diode impedance
place a lower limit on the source impedance. A 0.1μF
n NEG =
- V GOFF + V DROPOUT
V MAIN - 2 × V D
ceramic capacitor works well in most low-current appli-
cations. The flying capacitor ’s voltage rating must
exceed the following:
where n NEG is the number of negative charge-pump
stages, V GOFF is the gate-off linear-regulator REG N
output, V MAIN is the main step-up regulator output, V D
is the forward-voltage drop of the charge-pump diode,
and V DROPOUT is the dropout margin for the linear reg-
ulator. Use V DROPOUT = 0.3V.
The above equations are derived based on the
assumption that the first stage of the positive charge
pump is connected to V MAIN and the first stage of the
negative charge pump is connected to ground.
V CX > n × V MAIN
where n is the stage number in which the flying capaci-
tor appears, and V MAIN is the output voltage of the
main step-up regulator.
Charge-Pump Output Capacitor
Increasing the output capacitance or decreasing the
ESR reduces the output ripple voltage and the peak-to-
peak voltage during load transients. With ceramic
24
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| MAX1513EVKIT | 功能描述:电源管理IC开发工具 MAX1513/14 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 |
| MAX1514ETP | 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 |
| MAX1514ETP+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 |
| MAX1514ETP-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 |
| MAX1515ETG | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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