MP1530 – TRIPLE OUTPUT STEP-UP PLUS LINEAR REGULATORS FOR TFT BIAS

MP1530 Rev. 1.4

www.MonolithicPower.com

9

5/19/2006

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The positive linear regulator (GH) is then soft-

started and allowed to settle in one period of CT

ramp. Nine periods of the CT ramp have

occurred since the chip enabled. If all outputs

are in regulation (>80%), the CT will stop

ramping and be held at ground.

low. If any output remains below regulation

(<80%) before and through the nine CT periods,

RDY

will remain high and CT will begin its fault

timer pulse.

START 3

START 2

START 1

POWER ON RESET

0V

0V

0V

CT

EN

0V

IN

1.25V

OUTPUT

VOLTAGES

TIME

RDY

0V

Figure 2—Startup Timing Diagram