Reference design: bipolar TFT LCD supply using TPS65131-Q1 and charge pumps

This reference design details a display power circuit which generates a bipolar voltage rail for source drivers and additional supplies for gate drivers. Charge pumps are used to generate the voltage supply for gate drivers, which makes this design easy to implement. By using only one dc-dc converter to generate four voltage rails and therefore minimizing the amount of inductances, this circuit allows small design size.

Features:

• Complete power supply solution for TFT LCD display bias
• 4 output voltage rails
• Low quiescent current less than 0.5 mA
• Load regulation less than 2% on all rails
• Automotive qualified components

Parts Include:

TLVH431A            Low-Voltage Adjustable Precision Shunt Regulator 

TPS65130             Split-Rail Converter with Dual Positive and Negative Outputs (200mA typ) 

TPS65131             Split-Rail Converter with Dual Positive and Negative Outputs (300mA typ) 

TPS65131-Q1      Automotive Catalog Split-Rail Converter with Dual Positive and Negative Outputs (300mA typ) 

Learn more by downloading the reference design below