QuickView - MAX1570 White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump


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MAX1570 White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump

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Status

Active: In Production.

Description

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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).

An evaluation kit is available: MAX1570EVKIT

Key Features Applications/Uses

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
Protected by U.S. Patent #6,538,394 B2

Cell Phones/Smartphones
Digital Cameras and Camcorders
PDAs and Palmtop Computers
Portable MP3 Players
White LED Backlighting