MAX1599

PRODUCTION

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

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • 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

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
MAX1599
High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
MAX1561, MAX1599: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 2

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LED Drivers 5
MAX1848
PRODUCTION White LED Step-Up Converter in SOT23
MAX1570
PRODUCTION White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
MAX1910
PRODUCTION 1.5x/2x High-Efficiency White LED Charge Pumps
MAX1912
1.5x/2x High-Efficiency White LED Charge Pumps
MAX1916
PRODUCTION Low-Dropout, Constant-Current Triple White LED Bias Supply
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Evaluation Kits

MAX1561EVKIT

Evaluation Kit for MAX1561

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Features and Benefits

  • Constant-Current Regulation for Uniform Illumination
  • High 84% Efficiency
  • Flexible Analog or PWM Dimming Control
  • 900mW Output Power with Internal 30V MOSFET Switch
  • Output Overvoltage Protection
  • Low 15mVP-P Input Ripple
  • Small, Low-Profile Components
  • 2.6V to 5.5V Input Range
  • 0.3µA Shutdown Current
  • Tiny 3mm x 3mm Thin QFN
  • Fully Assembled and Tested

Product Details

The MAX1561 evaluation kit is a fully assembled and tested circuit board that evaluates the MAX1561 white LED step-up DC-to-DC converter. The circuit operates from 2.6V to 5.5V and delivers an adjustable 0 to 20mA to drive a series of up to six white LEDs in series.

Applications

  • Cell Phones/Smartphones
  • e-Books and Subnotebooks
  • PDAs, Palmtops, and Wireless Handhelds
  • White LED Display Backlighting
MAX1561EVKIT
Evaluation Kit for MAX1561

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