參數(shù)資料
型號(hào)： MAX749CSA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 4-Bit D-type Registers with 3-State Outputs 16-CDIP -55 to 125
中文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, SOP-8
文件頁(yè)數(shù)： 7/12頁(yè)
文件大?。?/td> 105K
代理商： MAX749CSA
Figure 4. Count-Up Operation
Figure 5. Reset Sequence without Shutdown. The device is not
shut down during reset.
Figure 6. Reset Sequence with Shutdown
In Figure 3, the MAX749 is reset when it is taken out of
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-
tions: Starting from shutdown, the device is turned on,
incremented, reset to mid-scale without being shut
down, incremented again, and finally shut down.
S hutdown Mode
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.
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 Proc edure
_________and Component S elec tion
S etting the Output V oltage
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).
The device is in regulation when V
FB
= 0V.
DAC Adjustment
On power-up or after a reset, the counter sets the DAC
output to mid-range, and -V
= R
x 13.33μA. Each
rising edge of ADJ increments the counter (and there-
fore the DAC output) in the direction of -V
OUT(MAX)
by
one count. When incremented beyond -V
OUT(MAX)
, the
M
Digitally Adjustable LCD Bias S upply
_______________________________________________________________________________________
7
Figure 3. Shutdown-Reset-On-Shutdown Sequence of Operation.
The device is not shut down during reset.
Figure 7. Control Sequence Example (see Output Voltage
Control section)
ADJ
CTRL
SHUTDOWN RESET
ON
SHUTDOWN
t
R
t
SD
ADJ
CTRL
HIGH
t
SH
t
SL
ADJ
CTRL
ON
RESET
ON
t
RS
t
RH
t
R
ADJ
CTRL
SHUTDOWN
RESET
ON
SHUTDOWN
INCREMENT
INCREMENT
ADJ
CTRL
SHUTDOWN
RESET
ON
t
RH
t
R
相關(guān)PDF資料
PDF描述
MAX749EPA 4-Bit D-type Registers with 3-State Outputs 20-LCCC -55 to 125
MAX749ESA Digitally Adjustable LCD Bias Supply
MAX7524 Retriggerable Monostable Multivibrators 16-CFP -55 to 125
MAX7624 CMOS 8-Bit Buffered Multiplying DACs
MAX7624CPE CMOS 8-Bit Buffered Multiplying DACs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX749CSA+ 功能描述:其他電源管理 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel
MAX749CSA+T 功能描述:顯示驅(qū)動(dòng)器和控制器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX749CSA-T 功能描述:顯示驅(qū)動(dòng)器和控制器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX749EPA 功能描述:顯示驅(qū)動(dòng)器和控制器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX749EPA+ 功能描述:其他電源管理 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*