MAX8727

MAX8727 19-3480; Rev 1; 8/05 EVAALVUAAILTAIOBNLEKIT TFT-LCD Step-Up DC-DC Converter General Description The MAX8727 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 MAX8727 incorporates currentmode, 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 30V internal MOSFET can generate output voltages up to 24V 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 MAX8727 is available in a 10-pin thin DFN package. Applications Notebook Computer Displays LCD Monitor Panels Features ♦ 90% Efficiency ♦ Adjustable Output from VIN to 24V ♦ 2.6V to 5.5V Input Supply Range ♦ Input Supply Undervoltage Lockout ♦ Pin-Programmable 640kHz/1.2MHz Switching Frequency ♦ Programmable Soft-Start ♦ 0.1µA Shutdown Current ♦ Small 10-Pin Thin DFN Package Ordering Information PART TEMP RANGE MAX8727ETB -40°C to +85°C MAX8727ETB+ -40°C to +85°C +Denotes lead-fre...