Catalyst Semiconductor CAT3643 3-Channel Ultra High Efficiency Quad-Mode LED Driver Handbook
Summary
Experience superior power management with this high-efficiency, 3-Channel LED driver. The Quad-Mode fractional charge pump utilizes groundbreaking EZDim™ technology to optimize energy use while precisely powering up to three LEDs across various input voltages. Ideal for electronics manufacturers designing low-power handheld devices, cellular phones, and display backlights. This technical guide provides comprehensive details on operating characteristics, ultra-low noise performance, robust protection features, and seamless system integration for optimal LED illumination performance.
Page 1 Text Content
CAT3643
3-Channel Ultra High Efficiency Quad-Mode™ LED Driver
FEATURES DESCRIPTION High efficiency 1.33x charge pump The CAT3643 is a high efficiency Quad-Mode TM fractional charge pump that can drive up to three
Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x
LEDs programmable by a one wire digital interface.
Drives up to 3 LEDs at 32m A each
The inclusion of a 1.33x fractional charge pump mode 1-wire EZDim™ LED current programming increases device efficiency by up to 10% over traditional 1.5x charge pumps with no added external
Power efficiency up to 92%
capacitors.
Low noise input ripple in all modes
“Zero” current shutdown mode Low noise input ripple is achieved by operating at a constant switching frequency which allows the use of
Soft start and current limiting
small external ceramic capacitors. The multi-fractional
Short circuit protection
charge pump supports a wide range of input voltages Thermal shutdown protection from 2.4V to 5.5V.
Tiny 12-pad XQFN, 12-pad TDFN and 16-pad
The EN/DIM logic input functions as a chip enable and
TQFN packages
a digital dimming interface for current setting of all LEDs. Six different current ratios are available via the
APPLICATION
interface.
LCD Display Backlight
The device is available in the tiny 12-pad XQFN 2.5 x
Cellular Phones
2.5mm with max height of 0.4mm or in 16-pad TQFN
Digital Still Cameras
or 12-pad TDFN 3mm x 3mm package with a max Handheld Devices height of 0.8mm.
ORDERING INFORMATION Catalyst Semiconductor’s Quad-Mode TM 1.33x charge pump switching architecture is patented.
Part Number Package Marking CAT3643HV2-T2 TDFN-12 3 x 3(1) HABF CAT3643HV2-GT2 TDFN-12 3 x 3(2) HABG CAT3643HV3-T2 TQFN-16 3 x 3(1) JAAE
TYPICAL APPLICATION CIRCUIT
CAT3643HV3-GT2 TQFN-16 3 x 3(2) JAAF
CAT3643HL1-T2 XQFN-12 2.5 x 2.5(1) LB Notes:
(1) Matte-Tin Plated Finish (Ro HS-compliant) VOUT
VIN VOUT
(2) Ni Pd Au Plated Finish (Ro HS-compliant) 2.4V CIN COUT to
(3) Quantity per reel is 2000 1µF
5.5V CAT3643 1µF
1-Wire
EZDim TM EN/DIM LED1
For Ordering Information details, see page 16. Programming
4.02kΩ GND
© Catalyst Semiconductor, Inc. 1 Doc. No. MD-5022 Rev. E Characteristics subject to change without notice
Page Summary Contents For Catalyst Semiconductor CAT3643 3-Channel Ultra High Efficiency Quad-Mode LED Driver Handbook
Manual Details
| Brand | QUAD |
|---|---|
| Pages | 17 |
| File Size | 339.22 KB |
| Published | May 27, 2026 |
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Frequently Asked Questions
What are the different operational modes of the CAT3643 driver?
It supports Quad-Mode operation, allowing for four distinct output levels: 1x, 1.33x, 1.5x, and 2x.
What protective features does the device include?
It incorporates short circuit protection and thermal shutdown protection to ensure safe operation.
In what physical packages is the CAT3643 offered?
The chip is available in three package formats: XQFN-12, TDFN-12, or TQFN-16.
How is LED dimming programmed using this module?
Dimming is controlled by a 1-wire digital interface connected to the EN/DIM pin for precise current setting of all LEDs.