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MAX1554：High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs

Smallest, Highest Efficiency, 40V Driver for Up to 10 White LEDs

The MAX1553/MAX1554 drive white LEDs in series with a constant current to provide efficient display backlighting 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. The MAX1553 has a current limit of 480mA for driving two to six white LEDs, while the MAX1554 has a current limit of 970mA for driving up to 10 white LEDs. A single analog/PWM Dual Mode™ input provides two simple means of brightness adjustment. A separate enable input provides on/off control. Soft-start minimizes inrush current during startup. The MAX1553/MAX1554 are available in space-saving 8-pin TDFN 3mm x 3mm packages.

Key Features 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 2.7V to 5.5V Input Voltage Range Analog or PWM Control of LED Intensity Optimized for Low Input Ripple Soft-Start Minimizes Inrush Current High Efficiency Improves Battery Life Up to 88% Efficiency Driving 6 LEDs Up to 82% Efficiency Driving 9 LEDs (20mA, VCC = 3.6V) Tiny 8-Pin, 3mm x 3mm TDFN Package Saves Space Small, Low-Profile External Components

Integrated 1-cell Li+ chargers and Smart Power Selectors™ with dual (AC adapter and USB) power inputs | Typical Operating Circuit Applications/Uses Cell Phones Color Display Backlight PDA, Palmtop, and Wireless Handhelds

DataSheet

Parametrics

Design kits & evaluation modules

• MAX1553EVKIT

Quality and Environmental Data

• MAX1554.pdf

Related Products

• MAX1561：High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
• MAX1848：White LED Step-Up Converter in SOT23

Ordering Information