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Maxim DC/DC converter tailored for TFT LCDs

Posted: 26 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? DC/DC converter? max8726?

Maxim Integrated Products introduced a triple-output DC/DC converter packaged in a low-profile TSSOP.

According to the company, the new MAX8726 provides the regulated voltages required by active matrix, thin-film transistor (TFT) LCDs. One high-power DC/DC converter and two low-power charge pumps convert the 3.3V to 5V input supply into three independent output voltages. The primary, high-power DC/DC converter generates a boosted output voltage up to 13V that is

regulated within 1 percent. The low-power BiCMOS control circuitry and the low on-resistance (0.35?) of the integrated MOSFET allows efficiency up to 93 percent. In addition, the 1MHz current-mode PWM architecture provides fast transient response and allows use of ultra-small inductors and ceramic capacitors, Maxim added.

Dual charge pumps independently regulate one positive output and one negative output. These low-power outputs use external diode and capacitor stages to regulate output voltages up to 40V and -40V.

The MAX8726 is available in a 16-pin TSSOP package, and operates over the -40C to 85C temperature range. Prices start at $3.07 (1,000-up, FOB USA). A pre-assembled MAX8726 evaluation kit is available with recommended external components to reduce design time.

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