MAX8753

TFT LCD DC-DC Converter with Integrated Charge Pumps

Data Sheet (Rev. 0)

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Overview

3 Integrated DC-DC Converters, 1 LDO

1MHz Current-Mode PWM Boost Regulator

Up to +13V Main High-Power Output

±1% Accuracy

High Efficiency (90%)

Dual Charge-Pump Outputs

No External Diodes for Positive Charge Pump

Up to +28V Positive Charge-Pump Output

Negative Charge-Pump Output

300mA Logic Linear Regulator

+2.6V to +5.5V Input Operating Range

0.8mA Quiescent Current

Internal Supply Sequencing and Soft-Start

Thermal Protection

Ultra-Thin, 28-Pin TQFN Package (0.8mm max)

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.

Applications