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


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Data Sheet
FULL DATA SHEET (PDF, 736kB)
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Description
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).

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

    Key Specifications:   White LED Drivers
    Part Number Topology Max. No. of LEDs Configuration Dimming Control POUT (W) IMAX per LED (mA) Min. VIN (V) Max. VIN (V) ICC (max) (mA) Max. VOUT (V) Operating Freq. (kHz) Package Smallest Available Package (max w/pins) (mm2) Price**
    MAX1570  Charge Pump 5 Parallel Analog
    PWM
    0.7 30 2.7 5.5 3.5 5 1000 TQFN/16 17 $1.90 @ 1k
    See All White LED Drivers (46)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX1570: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  • Application Note 1037: Charge-Pump and Step-Up DC-DC Converter Solutions for Powering White LEDs in Series or Parallel Connections - MAX1570
  • Application Note 3256: Why Drive White LEDs with Constant Current? - MAX1570

    Evaluation Kits
  • MAX1570EVKIT

    Reliability Reports
  • Show FIT data for:
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    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-4 of 4

    MAX1570 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1570ETE  
    TQFN;16 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0070 (PDF)
    Use pkgcode/variation: T1644-4*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1570ETE-T  
    TQFN;16 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0070 (PDF)
    Use pkgcode/variation: T1644-4*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1570ETE+  
    TQFN;16 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0070 (PDF)
    Use pkgcode/variation: T1644+4*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1570ETE+T  
    TQFN;16 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0070 (PDF)
    Use pkgcode/variation: T1644+4*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • New Product Press Release 2002-09-03 

    Related Products
    MAX1848 White LED Step-Up Converter in SOT23
    MAX1916 Low-Dropout, Constant-Current Triple White LED Bias Supply
    MAX1595 Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump
    MAX1910, MAX1912 1.5x/2x High-Efficiency White LED Charge Pumps

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     Description 
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    Document Ref.: 19-2526; Rev 1; 2005-07-01
    This page last modified: 2007-07-16


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