MAX8740 Datasheet | Maxim Integrated

Description Features - 90% Efficiency - Adjustable Output from VIN to 28V - 2.6V to 5.5V Input Supply Range - Input Supply Undervoltage Lockout - Pin-Programmable 640k Hz/1.2MHz Switching Frequency - Programmable Soft-Start - 0.1µA Shutdown Current - Small, 10-Pin Thin DFN Package The MAX8740 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 MAX8740 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 640k Hz 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 pensation pin (P) gives users flexibility in adjusting loop dynamics. The 30V internal MOSFET can generate output voltages up to 28V from a 2.6V and 5.5V input voltage range. Soft-start slowly ramps the input current and is programmed with an external capacitor. The MAX8740 is available in a 10-pin thin DFN package. Applications Notebook puter Displays LCD Monitor Panels PART MAX8740ETB Ordering Information TEMP RANGE -40°C to +85°C PIN-PACKAGE 10 TDFN 3mm x 3mm Pin Configuration VIN 2.6V TO 5.5V FREQ SS LX LX IN Minimal Operating Circuit VOUT TOP VIEW 6 8 IN 6 LX 7 LX FB 2 MAX8740 MAX8740 9 3 FREQ SHDN GND 5 GND 4 1 P 2 FB 3 SHDN 4 GND 5 GND P 1 THIN DFN 3mm x 3mm ________________________________________________________________ Maxim Integrated...