MAX749：数字调节LCD偏置电源 _ BDTIC a Leading Distributor in China

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MAX749：数字调节LCD偏置电源

可提供> -100V的驱动

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, simplifying software control. The MAX749 drives either an external P-channel MOSFET or a PNP transistor.

关键特性

+2.0V to +6.0V Input Voltage Range
Flexible Control of Output Voltage:
- Digital Control
- Potentiometer Adjustment
- PWM Control
Output Voltage Range Set by One Resistor
Low, 60µA Max Quiescent Current
15µA Max Shutdown Mode
Small Size - 8-Pin SO and Plastic DIP Packages

功能框图

产品应用

通信系统
笔记本电脑
笔记本电脑
掌上电脑
PDA及其它手持设备
便携式数据收集终端

关键参数

Part Number

V_IN
(V)

V_OUT1
(V)

I_OUT1
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Switch Type

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX749

-2

-100

0.1

Resistor

500

External

PDIP(N)/8

SOIC(N)/8

$2.79 @1k

数据手册DataSheet

英文	MAX749.pdf	Rev 1; 02/1995

技术资料

Linear Regulators in Portable Applications

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX749C/D	停止供货		DICE SALES,；NA引脚；DICE；		参考数据资料
MAX749CPA	生产中		PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：否
MAX749CPA+	生产中		PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：无铅
MAX749CSA	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX749CSA+	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX749CSA+T	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX749CSA-T	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX749EPA	生产中		PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：否
MAX749EPA+	生产中		PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX749ESA	最后一次购买	MAX749ESA+	SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：否
型号	状况	推荐替代产品	封装：类型引脚占位面积封装图编码/变更 *	温度	RoHS/无铅？
MAX749ESA+	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX749ESA+T	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX749ESA-T	停止供货	MAX749ESA+T	N.SO；8引脚	-40°C至+85°C	参考数据资料

MAX749.pdf MAX749

Linear Regulators in Portable Applications MAX883

MAX749.pdf MAX749