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LT1943

Linear
Part Number LT1943
Manufacturer Linear
Description High Current Quad Output Regulator
Published Apr 20, 2016
Detailed Description U U LT1943 High Current Quad Output Regulator for TFT LCD Panels FEATURES ■ 4 Integrated Switches: 2.4A Buck, 2.6A Boo...
Datasheet PDF File LT1943 PDF File

LT1943
LT1943

Overview
U U LT1943 High Current Quad Output Regulator for TFT LCD Panels 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 U APPLICATIO S ■ Large TFT-LCD Desktop Monitors ■ Flat Panel Televisions , LTC and LT are registered trademarks of Linear Technology Corporation.
PanelProtect is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTIO 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.
TYPICAL ...


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