MAX749CPA

MAX749CPA 的PDF资料

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MAX749CPA 的货源和报价

MAX749CPA 的相关技术信息

概述

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 应用

+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

通信系统

膝上型电脑

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

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

Multifunction PMIC

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (typ) (A)

Operating Current, I_CC (max) (mA)

Fixed Freq/PWM Operation

Operating Frequency (kHz)

Internal Power Switch(es)

Synchronous Rectifier

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price

MAX749

Inverting

LCD Supplies

2.0

6.0

-2.0

-100.0

0.1

0.06

Yes

500.0

•	Current limit

•

Shutdown

Yes

8/PDIP
8/SOIC

Yes

0 to +70 -40 to +85

$2.49 @ 1k

应用笔记

App Note 751: Linear Regulators in Portable Applications - MAX749 (English only)

注释

Drives P-channel MOSFET or PNP

相关产品

MAX774, MAX775, MAX776 -5V/-12V/-15V或可调、高效率、低I_Q、反相、DC-DC控制器 - 概述

图表

MAX749: Typical Operating Circuit