MAX1561
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
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Overview
Features and Benefits
- 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
Product Details
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).
Applications
- Cell Phones/Smartphones
- e-Books and Subnotebooks
- PDAs, Palmtops, and Wireless Handhelds
- White LED Display Backlighting
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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MAX1561 Reliability Data1/12/2023PDF93K
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NEW
Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently3/3/2023
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White-LED Boost Converter vs. Charge Pump1/28/2005
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Why Drive White LEDs with Constant Current?8/24/2004
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Charge-Pump and Step-Up DC-DC Converter Solutions for Powering White LEDs in Series or Parallel Connections4/23/2002
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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