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.

特点
  • 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
典型应用
LT1943 Typical Application
LT1943 Typical Application
应用
  • Large TFT-LCD Desktop Monitor Displays
  • Flat Panel Televisions
封装信息
LT1943 Package Drawing
Order Information 订购型号
器件型号封装温度价格 (以 1 ~ 99 片为批量)价格 (以 1000 片为批量) *
LT1943EFE#PBFTSSOP-28E$6.69$4.75
LT1943EFE#TRPBFTSSOP-28E$4.87
演示电路板
器件型号描述价格
DC620ALT1943EFE | 4-Output Sw. Reg. For TFT-LCD Panels, Vin = 8-20V, Vout = 3.3V @ 2A, 13V @ 500mA, 30V @ 30mA, -10V @ 50mA$150.00
DC697ALT1943EFE | 4-Output Switching Regulator For TFT-LCD Panels, Vin = 4.5V - 8V, Vout = 3.3V @ 1.5A, 13V @ 500mA, 30V @ 20mA, -10V @ 50mA$150.00
数据表
设计要点
可靠性数据
LT Journal
CAD 符号
相关产品
LT1943 - High Current Quad Output Regulator for TFT LCD Panels
DN349 - Quad Output Switching Converter Provides Power for Large TFT LCD Panels
R365 - Reliability Data
Feb 2004 Quad Output Switching Regulator Powers Large TFT Displays
LT1943 Footprints and Symbols