The MAX1554ETA+T is a high efficiency, 40V step-up converter for 2 to 10 white LEDs in 8 pin TDFN package. It drives white LEDs in series with a constant current to provide efficient display back lighting in cellular phones, PDAs and other hand held devices. The step-up converter includes an internal 40V, low RDSON, N-channel MOSFET switch for high efficiency and maximum battery life. It has a current limit of 970mA for driving up to 10 white LEDs. A single analogue /PWM Dual Mode input provides two simple means of brightness adjustment. A separate enable input provides on/off control and soft-start minimizes inrush current during start up.
Supply voltage range is 3.15V to 5.5V
Operating temperature range from -40°C to 85°C
Highly integrated and flexible solution for wide range of backlighting applications
Constant current regulation for even LED illumination
Internal 40V MOSFET switch capable of driving 10 LEDs
Analogue or PWM control of LED intensity
Optimized for low Iinput ripple
Small, low profile external components
High efficiency improves Battery life, up to 88% efficiency driving 6 LEDs
Up to 82% efficiency driving 9 LEDs (20mA, VCC = 3.6V)
(EN)
