參數(shù)資料
型號(hào)： MAX749
廠商： Maxim Integrated Products, Inc.
元件分類： 通用總線功能
英文描述： Synchronous 4-Bit Up/Down Binary Counters 16-CFP -55 to 125
中文描述： 數(shù)字調(diào)節(jié)LCD偏置電源
文件頁數(shù)： 1/12頁
文件大?。?/td> 105K
代理商： MAX749
Digitally Adjustable LCD Bias S upply
_______________General Desc ription
The MAX749 generates negative LCD-bias contrast
voltages from 2V to 6V inputs. Full-scale output voltage
can be scaled to -100V or greater, and is digitally
adjustable in 64 equal steps by an internal digital-to-
analog converter (DAC). Only seven small surface-
mount components are required to build a complete
supply. The output voltage can also be adjusted using
a PWM signal or a potentiometer.
A unique current-limited control scheme reduces supply
current and maximizes efficiency, while a high switching
frequency (up to 500kHz) minimizes the size of external
components. Quiescent current is only 60μA max and is
reduced to under 15μA in shutdown mode. While shut
down, the MAX749 retains the voltage set point, simpli-
fying software control. The MAX749 drives either an
external P-channel MOSFET or a PNP transistor.
________________________Applic ations
Notebook Computers
Laptop Computers
Palmtop Computers
Personal Digital Assistants
Communicating Computers
Portable Data-Collection Terminals
____________________________Features
o
+2.0V to +6.0V Input Voltage Range
o
Flexible Control of Output Voltage:
Digital Control
Potentiometer Adjustment
PWM Control
o
Output Voltage Range Set by One Resistor
o
Low, 60μA Max Quiescent Current
o
15μA Max Shutdown Mode
o
Small Size – 8-Pin SO and Plastic DIP Packages
M
_______________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
1
2
3
4
8
7
6
5
CS
DHI
DLOW
GND
FB
CTRL
ADJ
V+
DIP/SO
TOP VIEW
MAX749
__________________Pin Configuration
V+
ADJ
CTRL
FB
CS
DHI
DLOW
GND
V
IN
+5V
-V
OUT
R
SENSE
C
COMP
ON/OFF
DIGITAL
ADJUST
R
FB
1
0.1
μ
F
2
3
4
5
6
7
8
MAX749
__________Typic al Operating Circ uit
19-0143; Rev 1; 2/95
EVALUATION KIT MANUAL
PART
TEMP. RANGE
PIN-PACKAGE
MAX749CPA
0°C to +70°C
8 Plastic DIP
MAX749CSA
0°C to +70°C
8 SO
MAX749EPA
-40°C to +85°C
8 Plastic DIP
MAX749ESA
-40°C to +85°C
8 SO
MAX749C/D
0°C to +70°C
Dice*
______________Ordering Information
*Contact factory for dice specifications.
FOLLOWS DATA SHEET
相關(guān)PDF資料
PDF描述
MAX749CSA 4-Bit D-type Registers with 3-State Outputs 16-CDIP -55 to 125
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
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MAX7490CEE 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
MAX7490CEE+ 功能描述:有源濾波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
MAX7490CEE+T 功能描述:有源濾波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
MAX7490CEE-T 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
MAX7490EEE 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
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