- 您现在的位置：买卖IC网 > PDF目录16561 > MAX1579ETG+T (Maxim Integrated Products)IC PS BIAS/WHITE LED TFT 24-TQFN PDF资料下载
参数资料
| 型号： | MAX1579ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC PS BIAS/WHITE LED TFT 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 显示器 |
| 电流 - 电源： | 3mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
Complete Bias and White LED Power Supplies
for Small TFT Displays
Component Selection
Use only ceramic capacitors with an X5R, X7R, or bet-
ter dielectric. See Table 1 for a list of recommended
components.
Capacitor Selection
Use low-ESR ceramic capacitors. Recommended val-
ues for the capacitors are shown in Table 1. To ensure
stability over a wide temperature range, ceramic
capacitors with an X5R or X7R dielectric are recom-
mended. Place these capacitors as close to the IC as
possible.
Inductor Selection
Recommended inductor values range from 10μH to
47μH. A 22μH inductor optimizes the efficiency for most
applications while maintaining low 15mV P-P input ripple.
With input voltages near 5V, a larger value of inductance
can be more efficient. To prevent core saturation, ensure
that the inductor-saturation current rating exceeds the
peak inductor current for the application. Calculate the
peak inductor current with the following formula:
inductor, the diode, the input capacitor, and the output
capacitor. Keep traces short, direct, and wide. Keep
noisy traces, such as the LX node trace, away from CS.
The IN bypass capacitor (C IN ) should be placed as
close to the IC as possible. The transfer capacitors for
the charge pumps should be located as close as possi-
ble to the IC. PGND and GND should be connected
directly to the exposed paddle underneath the IC. The
ground connections of C IN and C OUT should be as
close together as possible. The traces from IN to the
inductor and from the Schottky diode to the LEDs may
be longer. The MAX1579 evaluation kit contains a sam-
ple layout to speed designs.
Chip Information
TRANSISTOR COUNT: 3801
PROCESS: BiCMOS
I PEAK =
V OUT ( MAX ) × I LED ( MAX )
0 . 8 × V IN ( MIN )
+
V IN ( MIN ) × 0 . 8 μ s
2 × L
Schottky Diode Selection
The MAX1578/MAX1579 require a high-speed rectifica-
tion diode (D1) for optimum performance. A Schottky
diode is recommended due to its fast recovery time
and low forward-voltage drop. Ensure that the diode’s
average and peak current ratings exceed the average
output current and the peak inductor current, respec-
tively. In addition, the diode’s reverse breakdown volt-
age must exceed V OUT . The RMS diode current is
calculated as:
I DIODE ( RMS ) = I OUT × I PEAK
PC Board Layout and Routing
Due to fast switching waveforms, careful PC board lay-
out is required. An evaluation kit (MAX1578EVKIT) is
available to speed design. When laying out a board,
minimize trace lengths between the IC and R1, the
______________________________________________________________________________________
11
相关PDF资料 |
PDF描述 |
|---|---|
| EBC22DRXS-S734 | CONN EDGECARD 44POS DIP .100 SLD |
| H3CKH-4018G | IDC CABLE - HKC40H/AE40G/HPK40H |
| H3BWH-2618M | IDC CABLE - HSR26H/AE26M/HPL26H |
| MAX1578ETG+T | IC PS BIAS/WHITE LED TFT 24-TQFN |
| KSZ8721BL-EVAL | BOARD EVALUATION FOR KSZ8721BL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1579EVKIT | 功能描述:LED 照明开发工具 Evaluation Kit for the MAX1579 RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX157ACPA | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX157ACPA+ | 功能描述:模数转换器 - ADC 10-Bit 2Ch 108ksps 5.25V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX157ACUA | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX157ACUA+ | 功能描述:模数转换器 - ADC 10-Bit 2Ch 108ksps 5.25V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
发布紧急采购，3分钟左右您将得到回复。