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MP1531

Low Power, Triple Output Step-Up Plus Charge Pump for TFT Bias

Monolithic Power Systems 

MP1531 – LOW POWER, TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS

VGH

OUTPUT

VOLTAGES

VIN

0V

VMAIN

VIN

IN

0V

VEN-HIGH

EN

0V

1.25V

CT

0V

VIN

RDY

0V

VGL

POWER ON RESET START 1

START 2

START 3

TIME

Figure 2—Start-Up Timing Diagram

APPLICATION INFORMATION

Setting the Output Voltages

Set the output voltage on each output by

selecting the resistive voltage divider ratio. The

voltage divider drops the output voltage to the

feedback threshold voltage. Use 10kΩ to 50kΩ

for the low-side resistor of the voltage divider.

For the step-up converter, determine the

high-side resistor R1 by the equation:

R1 = VMAIN − VFB1

⎜⎜⎝⎛

VFB1

R2

⎟⎟⎠⎞

Where VMAIN is the output voltage of the step-up

converter.

For the positive charge-pump, determine the

high-side resistor R9 by the equation:

R9 = VGH − VFB3

⎜⎜⎝⎛

VFB3

R8

⎟⎟⎠⎞

For the negative charge-pump, determine the

high-side resistor R7 by the equation:

R7 = −VGL

⎜⎜⎝⎛

VREF

R5

⎟⎟⎠⎞

MP1531 Rev. 1.2

www.MonolithicPower.com

7

5/22/2006

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