LT1943
PRODUCTIONHigh Current Quad Output Regulator for TFT LCD Panels
- Part Models
- 2
- 1ku List Price
- Starting From $7.99
Overview
- 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
- PanelProtect™ Circuitry Disables VON Upon Fault
- Available in Thermally Enhanced 28-Lead TSSOP
The LT1943 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.
Applications
- Large TFT-LCD Desktop Monitors
- Flat Panel Televisions
Documentation
Data Sheet 1
User Guide 2
Design Note 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT1943EFE#PBF | 28-Lead TSSOP w/ EP | ||
| LT1943EFE#TRPBF | 28-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT1943EFE#PBF | PRODUCTION | |
| LT1943EFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT1943EFE#PBF | PRODUCTION | |
| LT1943EFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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|---|---|---|
| Circuit Monitors 1 | ||
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| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT1943
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
LT1943EFE | 4-Output Switching Regulator For TFT-LCD Panels, VIN = 4.5V - 8V, VOUT = 3.3V @ 1.5A, 13V @ 500mA, 30V @ 20mA, -10V @ 50mA
Resources
LT1943EFE | 4-Output Switching Regulators for TFT-LCD Panels, VIN = 8 to 20V, VOUT = 3.3V @ 2A, 13V @ 500mA, 30V @ 30mA, –10V @ 50mA