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| 型号： | MAX17014ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/33页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY MULT-OUTPUT 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 8mA |
| 电源电压： | 8 V ~ 16.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
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Low-Cost Multiple-Output
Power Supply for LCD TVs
where I AVDD _ PEAK is the peak inductor current (see the
Inductor Selection section). For ceramic capacitors, the
output voltage ripple is typically dominated by
R COMP ≈
125 × V VIN × V AVDD × C AVDD
L AVDD × I AVDD ( MAX )
V AVDD _ RIPPLE(C) . The voltage rating and temperature
characteristics of the output capacitor must also be
considered. Note that all ceramic capacitors typically
have large temperature coefficient and bias voltage
C COMP ≈
V AVDD × C AVDD
1250 × I AVDD ( MAX ) × R COMP
n POS = GON DROPOUT AVDD
coefficients. The actual capacitor value in circuit is typi-
cally significantly less than the stated value.
Input Capacitor Selection
The input capacitor reduces the current peaks drawn
from the input supply and reduces noise injection into
the IC. A 22μF ceramic capacitor is used in the typical
operating circuit (Figure 1) because of the high source
impedance seen in typical lab setups. Actual applica-
tions usually have much lower source impedance since
the step-up regulator often runs directly from the output
of another regulated supply. Typically, the input capaci-
tance can be reduced below the values used in the typi-
cal operating circuit.
Rectifier Diode
The MAX17014’s high switching frequency demands a
high-speed rectifier. Schottky diodes are recommend-
ed for most applications because of their fast recovery
time and low forward voltage. In general, a 2A Schottky
diode complements the internal MOSFET well.
To further optimize transient response, vary R COMP in
20% steps and C COMP in 50% steps while observing
transient response waveforms.
Charge-Pump Regulators
Selecting the Number of Charge-Pump Stages
For highest efficiency, always choose the lowest number
of charge-pump stages that meet the output requirement.
The number of positive charge-pump stages is given by:
V + V ? V
V SUP ? 2 × V D
where n POS is the number of positive charge-pump
stages, V GON is the output of the positive charge-pump
regulator, V SUP is the supply voltage of the charge-
pump regulators, V D is the forward voltage drop of the
charge-pump diode, and V DROPOUT is the dropout
margin for the regulator. Use V DROPOUT = 300mV.
The number of negative charge-pump stages is given by:
Output-Voltage Selection
The output voltage of the step-up regulator can be
n NEG =
? V GOFF + V DROPOUT
V SUP ? 2 × V D
R 3 = R 4 × ? AVDD ? 1 ?
n POS = GON DROPOUT OUT
adjusted by connecting a resistive voltage-divider from
the output (V AVDD ) to GND with the center tap connect-
ed to FB1 (see Figure 1). Select R4 in the 10k Ω to 50k Ω
range. Calculate R3 with the following equation:
? V ?
? V FB 1 ?
where V FB1 , the step-up regulator’s feedback set point,
is 1.25V. Place R4 and R3 close to the IC.
Loop Compensation
Choose R COMP (R5 in Figure 1) to set the high-frequen-
cy integrator gain for fast transient response. Choose
C COMP (C17 in Figure 1) to set the integrator zero to
maintain loop stability.
where n NEG is the number of negative charge-pump
stages and V GOFF is the output of the negative charge-
pump regulator.
The above equations are derived based on the
assumption that the first stage of the positive charge
pump is connected to V AVDD and the first stage of the
negative charge pump is connected to ground.
Sometimes fractional stages are more desirable for bet-
ter efficiency. This can be done by connecting the first
stage to V OUT or another available supply. If the first
charge-pump stage is powered from V OUT , then the
above equations become:
V + V ? V
V SUP ? 2 × V D
For low-ESR output capacitors, use the following equa-
tions to obtain stable performance and good transient
response:
n NEG =
? V GOFF + V DROPOUT + V OUT
V SUP ? 2 × V D
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相关代理商/技术参数 |
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| MAX17014EVKIT+ | 功能描述:电源管理IC开发工具 MAX17014 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 |
| MAX17015AETP+ | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015AETP+T | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015BETP+ | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015BETP+T | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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