General Description

The MAX1748/MAX8726 triple-output DC-DC converters in a low-profile TSSOP package provide the regulated voltages required by active-matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs). One high-power DC-DC converter and two low-power charge pumps convert the +3.3V to +5V input supply voltage into three independent output voltages.

The primary 1MHz DC-DC converter generates a boosted output voltage (VMAIN) up to 13V using ultra-small inductors and ceramic capacitors. The low-power BiCMOS control circuitry and the low on-resistance (0.35Ω) of the integrated power MOSFET allows efficiency up to 93.

Features

♦ Three Integrated DC-DC Converters

♦ 1MHz Current-Mode PWM Boost Regulator

   Up to +13V Main High-Power Output

   ±1 Accuracy

   High Efficiency (93)

♦ Dual Charge-Pump Outputs

   Up to +40V Positive Charge-Pump Output

   Down to -40V Negative Charge-Pump Output

♦ Internal Supply Sequencing

♦ Internal Power MOSFETs

♦ +2.7V to +5.5V Input Supply

♦ 0.1µA Shutdown Current

♦ 0.6mA Quiescent Current

♦ Internal Soft-Start

♦ Power-Ready Output

♦ Ultra-Small External Components

♦ Thin TSSOP Package (1.1mm max)

Applications

   TFT Active-Matrix LCD Displays

   Passive-Matrix LCD Displays

   PDAs

   Digital Still Cameras

   Camcorders