MAX1574

PRODUCTION

180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN

White LED Charge Pump in 3mm x 3mm TDFN Achieves 83% Average Efficiency

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • Up to 180mA (60mA/LED) Drive Capability
  • 83% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
  • 0.5% (typ) LED Current Matching
  • Adaptive 1x/2x Mode Switchover
  • Low Input Ripple and EMI
  • 5% to 100% Dimming Through Single-Wire Serial Pulse Interface
  • Low 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Soft-Start Limits Inrush Current
  • Output Overvoltage Protection
  • Thermal-Shutdown Protection
  • 10-Pin 3mm x 3mm TDFN Package

The MAX1574 charge pump drives up to three white LEDs with regulated constant current for uniform intensity. By utilizing adaptive 1x/2x charge-pump modes and very-low-dropout current regulators, it achieves 180mA output drive capability and high efficiency over the 1-cell lithium-battery input voltage range. Fixed-frequency (1MHz) switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.

The MAX1574 uses an external resistor to set the fullscale 100% LED current. An enable input (EN) is used for simple on/off control or can be pulsed repeatedly to set lower LED current in multiple steps down to 5%. Once the desired brightness is set, the MAX1574 maintains constant LED current as long as EN is kept high. If EN is kept low for more than 2ms, the MAX1574 enters shutdown. The MAX1574 is available in a 10-pin 3mm x 3mm TDFN package (0.8mm max height).

Applications

  • Camera Strobes/Flashes and Movie Lights
  • Cell Phones/Smartphones
  • LCD Backlights
  • PDAs, Digital Cameras, and Camcorders
MAX1574
180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN
MAX1574: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 6

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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 13
MAX1573
PRODUCTION White LED 1x/1.5x Charge Pump in UCSP and Thin QFN
MAX1570
PRODUCTION White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
MAX1575
White LED 1x/1.5x Charge Pump for Main and Sub-Displays
MAX1910
PRODUCTION 1.5x/2x High-Efficiency White LED Charge Pumps
MAX1912
1.5x/2x High-Efficiency White LED Charge Pumps
MAX1582
High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting
MAX1583
White LED Camera-Flash Boost Converter
MAX1848
PRODUCTION White LED Step-Up Converter in SOT23
MAX1561
PRODUCTION High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
MAX1599
PRODUCTION High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
MAX1553
PRODUCTION High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
MAX1554
PRODUCTION High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
MAX1698
PRODUCTION High-Efficiency Step-Up Current Regulator for LEDs
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Evaluation Kits

MAX1574EVKIT

Evaluation Kit for the MAX1574

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Features and Benefits

  • Up to 180mA (60mA/LED) Drive Capability
  • 83% Average Efficiency (PLED /PBATT) over Li+ Battery Discharge
  • 0.6% LED Current Matching
  • Adaptive 1x/2x Mode Switchover
  • Low Input Ripple and EMI
  • 5% to 100% Single-Wire Serial Pulse Dimming
  • 0.1µA Low Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • 10-Pin, 3mm x 3mm TDFN Package
  • Fully Assembled and Tested

    • Product Details

    The MAX1574 evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX1574 white LED 1x/2x charge pump. The EV kit comes with 3 white surface-mount LEDs installed. A pulse generator circuit is provided on the EV kit for easy evaluation of the sin-gle- wire serial pulse-dimming feature of the MAX1574. The pulse generator also has a flash setting for flashing the LEDs at full brightness.

    Applications

    • Camera Strobes/Flashes and Movie Lights
    • Cell Phones/Smartphones
    • LCD Backlights
    • PDAs, Digital Cameras, and Camcorders
    MAX1574EVKIT
    Evaluation Kit for the MAX1574

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