CAT3661: LED Driver, Low Power, 1-Channel

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The CAT3661 is a high efficiency low power fractional charge pump that drives one LED with up to 5 mA of current. Soft-start current limiting and short-circuit protection are optimized for use with coin cell batteries.

Low noise input ripple and constant switching frequency allows the use of small external ceramic capacitors. This makes the CAT3661 ideal for EMI sensitive applications. The charge pump supports a wide range of input voltages from 2.0 V to 5.5 V.

The CAT3661 has a built-in circuitry to provide feedback to a microcontroller of Open/Short LED and Low battery events. The Low battery indicator trip point is internally fixed at 2.4 V. External resistors can be added to raise or lower the trip voltage, if needed.

The device is packaged in the tiny 16-lead TQFN 3 mm x 3 mm package with a max height of 0.8 mm.

The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x tri-mode charge pumps with no added external capacitors.
Features   Benefits
  • Quad Mode Charge Pump: 1x, 1.33x, 1.5x, 2x
  • Higher efficiency charge pump than competition, very compact solution, no inductor.
  • Low Quiescent Current 150 A Typical
  • High efficiency LED driver even at low LED current below 5mA.
  • Drives One LED up to 5 mA
  • Optimized for Coin Cell Battery Operation
  • Open/Short LED Fault Detection
  • Adjustable Low Battery Detection
  • Power Efficiency up to 92%
  • Low Noise Input Ripple in All Modes
  • Zero Current Shutdown Mode
  • Soft Start and Short Circuit Current Limiting
  • Thermal Shutdown Protection
  • Low Power LCD Display Backlight
  • Low Power Handheld Device Backlight
Technical Documentation & Design Resources
Application Notes (1) Package Drawings (1)
Budgetary Price/Unit
Case Outline
CAT3661HV3-GT2 Lifetime
Halide free
CAT3661 TQFN-16 510AD 1 260 Tape and Reel 2000 $0.6667
Market Leadtime (weeks) : Contact Factory
Case Outlines
CAT3661: LED Driver, Low Power, 1-Channel
CAT3661: LED Driver, Low Power, 1-Channel
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