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参数资料
| 型号： | MAX749CSA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC LCD BIAS SUPPLY DGT ADJ 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | LCD 显示器 |
| 电流 - 电源： | 60µA |
| 电源电压： | 2 V ~ 6 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
Digitally Adjustable LCD Bias Supply
In Figure 3, the MAX749 is reset when it is taken out of
ADJ
CTRL
shutdown, which sets the output at mid-scale. Figure 4
shows how to increment the counter. Figure 5 illustrates
a reset without shutting the device down.
Figure 7 provides an example of a sequence of opera-
t R
t SD
tions: Starting from shutdown, the device is turned on,
incremented, reset to mid-scale without being shut
SHUTDOWN RESET
ON
SHUTDOWN
down, incremented again, and finally shut down.
Shutdown Mode
Figure 3. Shutdown-Reset-On-Shutdown Sequence of Operation.
The device is not shut down during reset.
When CTRL and ADJ are both low, the MAX749 is shut
down (Table 1): The internal reference and biasing cir-
cuitry turn off, the output voltage drops to zero, and the
supply current drops to 15μA. The MAX749 retains its
DAC setting, simplifying software control.
ADJ
CTRL
t SH
t SL
HIGH
Reset Mode
If ADJ is high when CTRL is low, the DAC set point is
reset to mid-scale and the MAX749 is not shut down.
Mid-scale is 32 steps from the minimum, 31 steps from
the maximum.
Design Procedure
Figure 4. Count-Up Operation
ADJ
CTRL
_________and Component Selection
Setting the Output Voltage
The MAX749’s output voltage is set using an external
resistor and the internal current-output DAC. The full-
scale output voltage is set by selecting the feedback
resistor R FB according to the formula:
-V OUT(MAX) = R FB x 20μA (Figure 1).
t RS
t R
t RH
The device is in regulation when V FB = 0V.
DAC Adjustment
ON
RESET
ON
On power-up or after a reset, the counter sets the DAC
output to mid-range, and -V OUT = R FB x 13.33μA. Each
rising edge of ADJ increments the counter (and there-
Figure 5. Reset Sequence without Shutdown. The device is not
shut down during reset.
fore the DAC output) in the direction of -V OUT(MAX) by
one count. When incremented beyond -V OUT(MAX) , the
ADJ
CTRL
t R
t RH
ADJ
CTRL
INCREMENT
RESET
INCREMENT
SHUTDOWN
RESET
ON
SHUTDOWN
ON
SHUTDOWN
Figure 6. Reset Sequence with Shutdown
Figure 7. Control Sequence Example (see Output Voltage
Control section)
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX749CSA+ | 功能描述:其他电源管理 Digitally Adjustable LCD Bias Supply 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 |
| MAX749CSA+T | 功能描述:显示驱动器和控制器 Digitally Adjustable LCD Bias Supply 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 |
| MAX749CSA-T | 功能描述:显示驱动器和控制器 Digitally Adjustable LCD Bias Supply 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 |
| MAX749EPA | 功能描述:显示驱动器和控制器 Digitally Adjustable LCD Bias Supply 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 |
| MAX749EPA+ | 功能描述:其他电源管理 Digitally Adjustable LCD Bias Supply 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 |
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