Sunnyvale, Calif. - Maxim Integrated Products' MAX8726 is a triple-output DC/DC converter that provides the regulated voltages required by active matrix, thin-film transistor (TFT) liquid crystal displays (LCDs). One 200-mA DC/DC stage and two 20-mA charge pumps convert a 3.3- to 5-volt input into three independent output voltages.
The primary DC/DC converter generates a boosted output voltage up to 13 volts that is regulated within ±1 percent. The chip's low-power BiCMOS control circuitry and its low on-resistance (0.35 ohm) MOSFET deliver up to 93 percent efficiency. The charge-pumps independently regulate one positive output and one negative output. These outputs, which use external diode and capacitor stages, provide up to plus and minus 40 volts.
The chip's 1 MHz, current-mode PWM architecture provides fast transient response and allows use of ultra-small inductors and ceramic capacitors. The MAX8726 is available in a 16-pin TSSOP package and is rated for operation over -40 to +85°C. Prices start at $3.07 each (1000-up, FOB USA). A pre-assembled MAX8726 evaluation kit is available with recommended external components to reduce design time.