MAX8740

ABSOLUTE MAXIMUM RATINGS
LX to GND .............................................................-0.3V to +30V
IN,SHDN, FREQ, FB to GND ...................................-0.3V to +6V
COMP, SS to GND.......................................-0.3V to (VIN + 0.3V)
LX Switch Maximum Continuous RMS Current.....................2.4A
Continuous Power Dissipation (TA = +70°C)
10-Pin TDFN (derate 24.1mW/°C above +70°C).......1481.5mW
Operating Temperature Range .........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range ...........................-65°C to +160°C
Lead Temperature (soldering, 10s) ................................+300°C

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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 640kHz or 1.2MHz operation using a logic input pin (FREQ). The high switching frequencies of MAX8740 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 of MAX8740 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.