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参数资料
| 型号： | MAX17010ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/17页 |
| 文件大小： | 0K |
| 描述： | IC LCD DISPLAY BIAS 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 监视器，笔记本电脑显示器 |
| 电流 - 电源： | 50µA |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
Internal-Switch Boost Regulator with Integrated
High-Voltage Level Shifter and Op Amp
I IN ( DCMAX ) =
≈ 1 . 45 A
2 . 2 V × 0 . 8
Using the circuit’s minimum input voltage (2.2V) and
estimating efficiency of 80% at that operating point:
0.3A × 8.5V
,
The ripple current and the peak current are:
Rectifier Diode
The MAX17010’s high switching frequency demands a
high-speed rectifier. Schottky diodes are recommended
for most applications because of their fast recovery time
and low forward voltage. In general, a 2A Schottky
diode complements the internal MOSFET well.
I RIPPLE =
2 . 2 V × ( 8 . 5 V ? 2 . 2 V )
3 . 6 μ H × 8 . 5 V × 1 . 2 MHz
≈ 0 . 38 A
Output Voltage Selection
The output voltage of the main step-up regulator is
adjusted by connecting a resistive voltage-divider from
the output (V MAIN ) to AGND with the center tap con-
I PEAK = 1 . 45 A +
0.38A
2
≈ 1 . 64 A
nected to FB (see Figure 1). Select R2 in the 10k Ω to
50k Ω range. Calculate R1 with the following equation:
R 1 = R 2 × ? MAIN ? 1 ?
V RIPPLE ( C ) ≈ MAIN ? MAIN IN ?
Output Capacitor Selection
The total output-voltage ripple has two components: the
capacitive ripple caused by the charging and dis-
charging of the output capacitance, and the ohmic rip-
ple due to the capacitor’s equivalent series resistance
(ESR):
V RIPPLE = V RIPPLE ( C ) + V RIPPLE ( ESR )
I ? V ? V ?
C OUT ? V MAIN f OSC ?
? V ?
? V REF ?
where V REF , the step-up regulator’s feedback set point,
is 1.235V. Place R1 and R2 close to the IC.
Loop Compensation
Choose R COMP to set the high-frequency integrator
gain for fast transient response. Choose C COMP to set
the integrator zero to maintain loop stability.
For low-ESR output capacitors, use the following equa-
tions to obtain stable performance and good transient
R COMP ≈
C COMP ≈
and:
V RIPPLE ( ESR ) ≈ I PEAK R ESR ( COUT )
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-
response:
1000 × V IN × V OUT × C OUT
L × I MAIN ( MAX )
V OUT × C OUT
10 × I MAIN ( MAX ) × R COMP
teristics of the output capacitor must also be considered.
Input Capacitor Selection
The input capacitor (C IN ) reduces the current peaks
drawn from the input supply and reduces noise injec-
tion into the IC. A 10μF ceramic capacitor is used in the
Typical Applications Circuit (Figure 1) because of the
high source impedance seen in typical lab setups.
Actual applications usually have much lower source
impedance since the step-up regulator often runs
directly from the output of another regulated supply.
Typically, C IN can be reduced below the values used in
the Typical Applications Circuit. Ensure a low-noise
supply at IN by using adequate C IN . Alternatively,
greater voltage variation can be tolerated on C IN if IN is
decoupled from C IN using an RC lowpass filter, as
shown in Figure 1.
To further optimize transient response, vary R COMP in
20% steps and C COMP in 50% steps, while observing
transient response waveforms.
Applications Information
Power Dissipation
An IC’s maximum power dissipation depends on the
thermal resistance from the die to the ambient environ-
ment, and the ambient temperature. The thermal resis-
tance depends on the IC package, PCB copper area,
other thermal mass, and airflow.
The MAX17010, with its exposed backside paddle sol-
dered to an internal ground layer in a typical multilayer
PCB, can dissipate about 2.8W into +70°C still air.
More PCB copper, cooler ambient air, and more airflow
increase the possible dissipation, while less copper or
warmer air decreases the IC’s dissipation capability.
The major components of power dissipation are the
power dissipated in the step-up regulator and the
power dissipated by the op amps.
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| MAX17014AETM+T | 功能描述:显示驱动器和控制器 Power Supply for LCD TVs RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17014ETM+ | 功能描述:其他电源管理 Power Supply for LCD TVs RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX17014ETM+T | 功能描述:显示驱动器和控制器 Power Supply for LCD TVs RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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