• 简体中文
• English

MAX1599：High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs

26V, Step-Up DC-DC Powers Up to 6 White LEDs with Up to 87% Efficiency

The MAX1561/MAX1599 step-up converters drive up to six white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. The step-up converter topology allows series connection of the white LEDs so the LED currents are identical for uniform brightness. This configuration eliminates the need for ballast resistors and expensive factory calibration. The MAX1561/MAX1599 include an internal, high-voltage, low-RDS(ON) N-channel MOSFET switch for high efficiency and maximum battery life. A single Dual Mode™ input provides a simple means of brightness adjustment and on/off control. Fast 1MHz (500kHz for the MAX1599) current-mode, pulse-width modulated (PWM) operation allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup. Both devices are available in a space-saving, 8-pin 3mm x 3mm thin DFN package with exposed paddle (EP).

Key Features Accurate Current Regulation for Uniform Illumination High Efficiency Up to 87% Flexible Analog or PWM Dimming Control Up to 900mW Output Power with Internal 30V MOSFET Switch Fast 1MHz (MAX1561) or 500kHz (MAX1599) PWM Operation Small, Low-Profile External Components 2.6V to 5.5V Input Range 26V (max) Output with Overvoltage Protection Optimized for Low 15mVP-P Input Ripple Soft-Start with Zero Inrush Current 0.3µA Shutdown Current Tiny 8-Pin 3mm x 3mm Thin DFN Package

MAX1561, MAX1599: Typical Operating Circuit Applications/Uses Cell Phones/Smartphones e-Books and Subnotebooks PDAs, Palmtops, and Wireless Handhelds White LED Display Backlighting

DataSheet

Parametrics

Design kits & evaluation modules

• MAX1561EVKIT

Quality and Environmental Data

• MAX1599.pdf

Related Products

• MAX1570：White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
• MAX1912：1.5x/2x High-Efficiency White LED Charge Pumps
• MAX1910：1.5x/2x High-Efficiency White LED Charge Pumps
• MAX1916：Low-Dropout, Constant-Current Triple White LED Bias Supply
• MAX1848：White LED Step-Up Converter in SOT23

Ordering Information