CAT4139: White LED Driver, High Current Boost, 22 V

Description: The CAT4139 is a DC/DC step-up converter that deli...
  • The CAT4139 is a DC/DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1. The CAT4139 is ideal for driving parallel strings of up to five white LEDs in series or up to 22 V.

    LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power-down mode with 'zero' quiescent current.

    In addition to thermal protection and overload current limiting, the device also enters a very low power operating mode during 'Open LED' fault conditions.
  • Features
  • Switch Current Limit 750 mA
  • Drives LED strings up to 22 V
  • Up to 87% Efficiency
  • Low Quiescent Ground Current 0.6 mA
  • 1 MHz Fixed Frequency Low noise Operation
  • Soft start “in-rush” current limiting
  • Shutdown current less than 1 µA
  • Open LED Overvoltage Protection
  • Automatic Shutdown at 1.9 V (UVLO)
  • Thermal overload protection
  • Applications
  • LED Drive for Parallel Strings
  • End Products
  • GPS Navigation Systems
  • Portable Media Players
  • Technical Documentation & Design Resources
    Product Change Notification
    Availability and Samples
    CAT4139TD-GT3
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: White LED Driver, High Current Boost, 22 V
  • Package Type: TSOT-23-5
  • Package Case Outline: 419AE
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 3000
  • Inventory

  • Market Leadtime (weeks):4 to 8
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  • Packages
    Applications
    Specifications
  • Topology: Step-Up 
  • VIN Min (V): 2.2 
  • VIN Max (V): 5.5 
  • VO Max (V): 24 
  • IO Max (mA): 350 
  • fSW Typ (kHz): 1000 
  • Package Type: TSOT-23-5 
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