MP1531 – LOW POWER, TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS
OPERATION
The MP1531 is a step-up converter with two
integrated linear regulators to power TFT LCD
panels. Typically the linear regulators are
powered from diode charge-pumps driven from
the switch node (SW). The user can set the
positive charge-pump to be a doubler, tripler, or
quadrupler to achieve the required linear
regulator input voltage for the selected output
voltage. Typically the negative charge-pump is
configured as a 1x or 2x inverter.
IN
REFERENCE
V
REF
+
G
M
FB1
COMP
--
PULSE-WIDTH
MODULATOR
REF
SW
OSCILLATOR
0.8V
REF
+
0.8V
REF
+
PGND
--
0.2V
REF
+
SOFT-START
FAULT TIMER
&
SEQUENCING
--
--
EN
CT
FB2
+
--
IN2
GH
GL
RDY
--
V
REF
+
FB3
IN3
GND
Figure 1—Functional Block Diagram
MP1531 Rev. 1.2
5/22/2006
www.MonolithicPower.com
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