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| 型号： | MAX1513ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/28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
capacitors, the output voltage ripple is dominated by
the capacitance value. Use the following equation to
approximate the required capacitor value:
Pass-Transistor Selection
The pass transistor must meet specifications for current
gain (h FE ), input capacitance, collector-emitter satura-
tion voltage, and power dissipation. The transistor’s
C OUT _ CP ≥
I LOAD _ CP
2 f OSC V RIPPLE _ CP
current gain limits the guaranteed maximum output cur-
rent to:
I LOAD ( MAX ) = ? I DRV -
where C OUT_CP is the output capacitor of the charge
pump, I LOAD_CP is the load current of the charge
?
?
V BE ?
R BE ? ?
× h FE ( MIN )
pump, and V RIPPLE_CP is the peak-to-peak value of the
R UPPER LOWER × ?
? V OUT _ ?
- 1 ?
P = I LOAD ( MAX )_ LR ( IN ( MAX )_ LR - V OUT_LR )
R 3 = R 4 × ? FBN GOFF ?
output ripple.
The charge-pump output capacitor is typically also the
input capacitor for a linear regulator. Often, its value must
be increased to maintain the linear regulator’s stability.
Charge-Pump Rectifier Diodes
Use low-cost silicon switching diodes with a current rating
equal to or greater than twice the average charge-pump
input current. If their low forward voltage helps to avoid an
extra stage, some or all of the diodes can be replaced
with Schottky diodes with equivalent current ratings.
Linear-Regulator Controllers
Output-Voltage Selection
Adjust the positive linear-regulator (REG P, REG L, and
REG G) output voltages by connecting a resistive volt-
age-divider from their respective outputs to the analog
ground plane (which connects to GND) with the center
tap connected to FB_ (Figure 1). Select the lower resis-
tor of the divider in the range of 10k ? to 30k ? . Calculate
the upper resistor with the following equation:
= R
? V FB _ ?
where V OUT _ is the output voltage of the respective lin-
ear regulator, and V FB _ = 1.25V (typ).
Adjust the gate-off linear-regulator REG N output volt-
age by connecting a resistive voltage-divider from
V GOFF to REF with the center tap connected to FBN
(Figure 1). Select R4 between 20k ? and 50k ? .
Calculate R3 with the following equation:
? V - V ?
? V REF - V FBN ?
where V FBN = 250mV, V REF = 1.25V. Note that REF can
only source up to 50μA; using a resistor less than 20k ?
for R4 results in higher bias current than REF can sup-
ply without degrading REF accuracy.
where I DRV is the minimum guaranteed base-drive cur-
rent and R BE is the pullup resistor connected between
the transistor’s base and emitter. Furthermore, the tran-
sistor’s current gain increases the linear regulator’s DC
loop gain (see the Stability Requirements section), so
excessive gain destabilizes the output. Therefore, tran-
sistors with current gain over 100 at the maximum out-
put current can be difficult to stabilize and are not
recommended unless needed to meet output-current
requirements.
The transistor’s saturation voltage at the maximum out-
put current determines the minimum input-to-output
voltage differential that the linear regulator supports.
Also, the package’s power dissipation limits the use-
able maximum power-dissipation capability of the tran-
sistor’s package, and mounting must exceed the actual
power dissipation in the device. The power dissipation
equals the maximum load current (I LOAD(MAX)_LR )
times the maximum input-to-output voltage differential:
× V
where V IN(MAX)_LR is the maximum input voltage of the
linear regulator and V OUT_LR is the output voltage of
the linear regulator.
Stability Requirements
The MAX1513/MAX1514 linear-regulator controllers use
an internal transconductance amplifier to drive an
external pass transistor. The transconductance amplifi-
er, the pass transistor, the base-emitter resistor, and
the output capacitor determine the loop stability. The
following applies equally to all linear regulators in the
MAX1513 and MAX1514.
The transconductance amplifier regulates the output
voltage by controlling the pass transistor’s base cur-
rent. The total DC loop gain is approximately:
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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