MAX1574
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MAX1574

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

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

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.07
Features
  • 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
Additional Details
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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
Part Models 2
1ku List Price Starting From $2.07

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX1574ETB+
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MAX1574ETB+T
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Product Lifecycle

PCN

Jun 20, 2016

- 1612

ASSEMBLY

MAX1574ETB+

PRODUCTION

MAX1574ETB+T

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Jun 20, 2016

- 1612

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ASSEMBLY

MAX1574ETB+

PRODUCTION

MAX1574ETB+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX1574EVKIT

Evaluation Kit for the MAX1574

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MAX1574EVKIT

Evaluation Kit for the MAX1574

Evaluation Kit for the MAX1574

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 Detail

    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

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