LCD-bias supply


Posted on Nov 11, 2012

The circuit in Figure 1 provides ±18 to ±20V adjustable LCD bias voltages with 1% tracking accuracy. The circuit operates from a single 4.2 to 2.5V Li-ion cell for portable monochrome LCD applications. The circuit comprises two blocks: a negative-bias supply using the LT1611 inverting switching regulator and a positive-bias supply using the LT1636 rail-to-rail op amp. The LT1611 converts the Li-ion battery input voltage to a negative output voltage.



The LT1636 rail-to-rail op amp generates the positive LCD-bias output. The large capacitive-load capability, low quiescent current, and high-impedance input stage make the LT1636 suitable in this application. The LT1636 inverts the LT611`s output to




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