MAX1570

PRODUCTION

White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • Excellent 0.3% LED-to-LED Current Matching
  • 30mA/LED Drive Capability
  • Proprietary 1x/1.5x Modes for Ultra-High Efficiency
  • Low Input Ripple and EMI
  • Eliminates Ballast Resistors
  • Digital or PWM LED Dimming Control
  • 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Soft-Start Limits Inrush Current
  • Thermal-Shutdown Protection
  • No External Inductor, Schottky, or Zener Diode Required
  • Tiny 16-Pin 4mm x 4mm Thin QFN Package

The MAX1570 fractional charge pump drives up to five white LEDs with regulated constant current for uniform intensity. The MAX1570 maintains the highest possible efficiency over the full 1-cell lithium-ion (Li+) battery input voltage range by utilizing a 1x/1.5x fractional charge pump and very-low-dropout current regulators. The MAX1570 operates with 1MHz fixed-frequency switching, allowing for tiny external components. The regulation scheme is optimized to ensure low EMI and low input ripple.

An external resistor sets the full-scale LED current, while two digital inputs control on/off and select between three levels of brightness. A pulse-width modulation (PWM) signal can also be used to modulate LED brightness.

The MAX1570 is available in 16-pin 4mm x 4mm Thin QFN packaging (0.8mm max height).

Applications

  • Cell Phones/Smartphones
  • Digital Cameras and Camcorders
  • PDAs and Palmtop Computers
  • Portable MP3 Players
  • White LED Backlighting
MAX1570
White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
MAX1570: 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
Charge Pumps 1
MAX1595
PRODUCTION Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump
LED Drivers 4
MAX1912
1.5x/2x High-Efficiency White LED Charge Pumps
MAX1848
PRODUCTION White LED Step-Up Converter in SOT23
MAX1916
PRODUCTION Low-Dropout, Constant-Current Triple White LED Bias Supply
MAX1910
PRODUCTION 1.5x/2x High-Efficiency White LED Charge Pumps
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Evaluation Kits

MAX1570EVKIT

Evaluation Kit for the MAX1570

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Features and Benefits

  • Excellent (0.3%) LED-to-LED Current Matching
  • 2.7V to 5.5V Input Range
  • 30mA/LED Drive Capability
  • Five LEDs at 150mA Total Current
  • 0.1µA (typ) IC Shutdown Current
  • Digital PWM LED Dimming Control
  • Fixed 1MHz Switching Frequency
  • Surface-Mount Component Construction
  • 16-Pin 4mm x 4mm Thin QFN Package
  • Fully Assembled and Tested

Product Details

The MAX1570 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board. The EV kit contains the MAX1570, a white LED driver with high-efficiency charge pump. The EV kit accepts a 2.7V to 5.5V input and drives up to five white LEDs with regulated constant current for uniform intensity. The MAX1570 runs at 1MHz fixed frequency, allowing tiny external components.

Applications

  • Cell Phones/Smartphones
  • Digital Cameras and Camcorders
  • Portable MP3 Players
  • White LED Backlighting
MAX1570EVKIT
Evaluation Kit for the MAX1570

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