The MAX8753 quadruple-output DC-DC converter provides
the regulated voltages required by active-matrix,
thin-film transistor (TFT), liquid-crystal displays (LCDs).
It includes a high-power step-up regulator (V
MAIN), two
low-power charge pumps (V
POS and V
NEG), and a low-voltage 300mA linear regulator (V
LOGIC).
The step-up DC-DC converter is a high-frequency
(1MHz) current-mode regulator with a built-in power
MOSFET that allows the use of ultra-small inductors and
ceramic capacitors. It provides fast transient response
to pulsed loads and includes an automatic pulse-skipping
mode that increases efficiency over a wide-load
current range. The 1.5A current limit allows a +10V output
at more than 300mA from a +3.3V input.
The two charge pumps independently regulate one
positive and one negative output voltage. The positive
charge pump is a voltage tripler that accepts an input
voltage up to +13V and delivers a 20mA output up to
+28V without external switches or diodes. The negative
charge pump inverts an input voltage up to +24V and
delivers a 20mA negative output using external diodes.
The logic linear regulator converts the IC's +2.6V-to-+5.5V input to a regulated +2.5V or adjustable output.
The MAX8753 is available in a 28-pin thin QFN package
with a maximum thickness of 0.8mm for ultra-thin
LCD panel design.
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