MAX1881 - 四路输出、TFT LCD DC-DC转换器，带有缓冲器

MAX1881是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1881是四路输出、TFT LCD DC-DC转换器，带有缓冲器，本站介绍了MAX1881的封装应用图解、特点和优点、功能等，并给出了与MAX1881相关的Maxim元器件型号供参考。

MAX1881 - 四路输出、TFT LCD DC-DC转换器，带有缓冲器 - DC-DC开关调节器 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

The MAX1778/MAX1880–MAX1885 multiple-output DC-DC converters provide the regulated voltages required by active matrix thin-film transistor (TFT) liquid crystal displays (LCD) in a low-profile TSSOP package. One high-power step-up converter and two low-power charge pumps convert the 2.7V to 5.5V input voltage into three independent output voltages. A built-in linear regulator and VCOM buffer complete the power-supply requirements.

The main step-up converter accurately generates an externally set output voltage up to 13V that can supply the display's row/column drivers. The converter's high switching frequency and current-mode PWM architecture provide fast transient response and allow the use of small low-profile inductors and ceramic capacitors. The low-power BiCMOS control circuitry and internal 14V switch (0.35≈ N-channel MOSFET) enable efficiencies up to 91%.

The dual low-power charge pumps (MAX1778/ MAX1880/MAX1881/MAX1882 only) independently regulate one positive output (VPOS) and one negative output (VNEG). These low-power outputs use external diode and capacitor stages (as many stages as required) to regulate output voltages up to +40V and -40V. A unique control scheme minimizes output ripple as well as capacitor sizes for both charge pumps.

A resistor-programmable, 40mA, low-dropout linear regulator (MAX1778/MAX1881/MAX1883/MAX1884 only) provides preregulation or postregulation for any of the supplies. For higher current applications, an external transistor can be added. Additionally, the VCOM buffer provides a high current output that is ideal for driving the capacitive backplane of TFT LCD panels. The VCOM buffer's output voltage is preset with an internal 50% resistive-divider or can be externally adjusted for other voltages.

The MAX1778/MAX1880–MAX1885 are protected against output undervoltage and thermal overload conditions by a latched fault detection circuit that shuts down the device. All devices are available in the ultra-thin TSSOP package (1.1mm max height).

关键特性

以下关键特性由Maxim美信半导体提供：

500kHz/1MHz Current-Mode PWM Step-Up Regulator

Up to +13V Main High-Power Output

±1% Accurate

High Efficiency (91%)

Dual Regulated Charge-Pump Outputs (MAX1778/MAX1880–MAX1882 only)

Up to +40V Positive Charge-Pump Output

Up to -40V Negative Charge-Pump Output

Low-Dropout 40mA Linear Regulator (MAX1778/MAX1881/MAX1883/MAX1884 only)

Up to +15V LDO Input

Optional Higher Current with External Transistor

2.7V to 5.5V Input Supply

Internal Supply Sequencing and Soft-Start

Power-Ready Output

Adjustable Fault-Detection Latch

Thermal Protection (+160°C)

0.1µA Shutdown Current

0.7mA IN Quiescent Current

Ultra-Small External Components

Thin TSSOP Package (1.1mm max height)

热门应用

TFT-LCD台式机监视器

TFT-LCD笔记本显示器

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