LT1943 High Current Quad Output Regulator for TFT LCD Panels

The LT®1943 quad output adjustable switching regulator provides power for large TFT LCD panels. The device, housed in a low profile 28 pin thermally enhanced TSSOP package, can generate a 3.3V or 5V logic supply along with the triple output supply required for the TFT LCD panel. Operating from an input range of 4.5V to 22V, a step-down regulator provides a low voltage output VLOGIC with up to 2A current. A high-power step-up converter, a lowerpower step-up converter and an inverting converter provide the three independent output voltages AVDD, VON and VOFF required by the LCD panel. A high-side PNP provides delayed turn-on of the VON signal and can handle up to 30mA. Protection circuitry ensures that VON is disabled if any of the four outputs are more than 10% below the programmed voltage.

All switchers are synchronized to an internal 1.2MHz clock, allowing the use of low profile inductors and ceramic capacitors throughout. A current mode architecture provides excellent transient response. For best flexibility, all outputs are adjustable. Soft-start is included in all four channels. A PGOOD pin can drive an optional PMOS pass device to provide output disconnect for the AVDD output.

产品特点 Features
  • 4 Integrated Switches: 2.4A Buck, 2.6A Boost,
  • 0.35A Boost, 0.35A Inverter (Guaranteed Minimum Current Limit)
  • Fixed Frequency, Low Noise Outputs
  • Soft-Start for all Outputs
  • Externally Programmable VON Delay
  • Integrated Schottky Diode for VON Output
  • PGOOD Pin for AVDD Output Disconnect
  • 4.5V to 22V Input Voltage Range
  • PanelProtectTM Circuitry Disables VON Upon Fault
  • Available in Thermally Enhanced 28-Lead TSSOP
参数
LT1943 参数
应用
  • Large TFT-LCD Desktop Monitor Displays
  • Flat Panel Televisions
典型应用图
LT1943 典型应用
LT1943 订购信息和价格参考Package Variations and Pricing
器件型号 封装 引脚 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量) *
LT1943EFE TSSOP 28 E $7.50  $5.25 
LT1943EFE#PBF TSSOP 28 E $7.50  $5.25 
LT1943EFE#TR TSSOP 28 E $5.37 
LT1943EFE#TRPBF TSSOP 28 E $5.37 
LT1943 数据手册及相关资料下载
  1. 数据手册(英文) : LT1943 - High Current Quad Output Regulator for TFT LCD Panels.PDF
  2. 设计要点 (英文) : DN349 - Quad Output Switching Converter Provides Power for Large TFT LCD Panels.PDF
  3. 可靠性数据 : R365 Reliability Data .PDF