MAX722数据手册集成电路（IC）的显示驱动器规格书PDF

描述 Description

The MAX722 and MAX723 CMOS power-supply ICs create dual regulated DC outputs for small, battery-operated microprocessor systems. Each device generates a main output (3V or 5V, selectable) and a negative auxiliary output that is adjustable for LCDs. Each device accepts two input voltages. Power can come from a main battery (two or three alkaline or NiCAD), or an unregulated DC source such as an AC-DC wall adapter.
The MAX722/MAX723 provide three improvements over prior-art devices. Physical size is reduced; the high switching frequencies (up to 0.5MHz), made possible by MOSFET power transistors, allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is also improved to 87% (10% better than with low-voltage regulators made in bipolar technology). And supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation (PFM) control scheme.
The MAX722 and MAX723 differ only in the lower fixed output voltage of the main regulator, with a 3.3V output for the MAX722 and a 3.0V output for the MAX723.
For flash memory or PCMCIA applications that require a +12V output voltage, refer to the MAX717–721 data sheet.

特性 Features

• Low 0.9V to 5.5V Battery Input Range
• Unregulated 7V to 20V DC Input Range
• Dual Regulated Outputs
• Main Output: 3.3V/5V
• Auxiliary Output: 0V to -100V
• 87% Efficiency at 200mA
• Efficient PRAM Keep-Alive: 80% at 1mA
• 8W/in³ Power Density
• 60µA Quiescent Current
• 20µA Shutdown Mode with VREF Alive
• 500kHz Maximum Switching Frequency
• ±1.5% VREF Tolerance (Over Temp.)
• Detect Output Power Failures
• 16-Pin Narrow SO Packages

应用 Application

• 条码扫描仪
• LCD对比度调节
• 医疗仪表
• 掌上电脑
• 便携式数据通信
• 便携式数据收集设备

简介

MAX722属于集成电路（IC）的显示驱动器。由制造生产的MAX722显示驱动器显示驱动器是一种集成电路 (IC)，可在微处理器 (MPU)、微控制器 (MCU) 或其他电路系统之间提供转换、接口和控制，用于 LCD、LED、OLED、DLP、真空荧光和 AMOLED 等显示器。可能的通信接口和协议包括模拟、BCD、I2C、并行、串行、SMBus、SPI 和 QSPI。