TFT-LCD Step-Up DC-DC Converter

The MAX17062 is a high-performance step-up DC-DC converter that provides a regulated supply voltage for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The MAX17062 incorporates current-mode, fixed-frequency, pulse-width modulation (PWM) circuitry with a built-in n-channel power MOSFET to achieve high efficiency and fast-transient response.

Users can select 640kHz or 1.2MHz operation using a logic input pin (FREQ). The high switching frequencies allow the use of ultra-small inductors and low-ESR ceramic capacitors. The current-mode architecture provides fast transient response to pulsed loads. A compensation pin (COMP) gives users flexibility in adjusting loop dynamics. The 22V internal MOSFET can generate output voltages up to 20V from an input voltage between 2.6V and 5.5V. Soft-start slowly ramps the input current and is programmed with an external capacitor.

The MAX17062 is available in a 10-pin TDFN package.

Applications

* LCD Monitor Panels * LCD TV Panels * Notebook Computer Displays

* 90% Efficiency

* Adjustable Output from VIN to 20V

* 2.6V to 5.5V Input Supply Range

* Input Supply Undervoltage Lockout

* Pin-Programmable 640kHz/1.2MHz Switching Frequency

* Programmable Soft-Start

* Improved EMI

* FB Regulation Voltage Tolerance < 1%

* Small 10-Pin TDFN Package

* Thermal-Overload Protection