LINEAR TECHNOLOGY LTC3219 User's Manual
Summary
The LTC3219 is a highly integrated, multi-mode LED driver designed for complex display applications. This chip provides power to up to nine independent LED current sources, offering exceptional efficiency via its charge pump architecture (operating in various modes) and advanced thermal/short-circuit protection. The device allows designers granular control over brightness, dimming, and On/Off status for every channel using a simple I²C serial interface. Ideal for electronics professionals designing portable devices, video phones, or custom lighting solutions requiring high performance and precise LED management.
Page 1 Text Content
LTC3219
250m A Universal
Nine Channel LED Driver
FEATURES DESCRIPTION ■ Multimode Charge Pump Provides Up to 91%
The LTC®3219 is a highly integrated multidisplay LED
Effi ciency driver. The device contains a high effi ciency, low noise ■ Slew Limited Switching Reduces Conducted and
charge pump to provide power to nine universal LED
Radiated Noise (EMI) current sources. The LTC3219 requires only fi ve small ■ Up to 250m A Total Output Current
ceramic capacitors to form a complete LED power supply
■ Nine 28m A Universal Current Sources with 64-Step
and current controller.
Linear Brightness Control
The maximum display currents are set by an internal pre-
■ Independent On/Off, Brightness Level, Blinking and
cision current reference. Independent dimming, On/Off,
Gradation Control for Each Current Source Using
blinking and gradation control for all current sources is
2-Wire I2CTM Interface
achieved via the I2C serial interface. 6-bit linear DACs are
■ Internal Current Reference
available for adjusting brightness levels for each universal
■ Confi gurable ENU Pin for Asynchronous LED On/Off
LED current source.
Control ■ Low Noise Charge Pump Operates in 1x, 1.5x or 2x The LTC3219 charge pump optimizes effi ciency based on
Mode for Optimal Effi ciency* the voltage across the LED current sources. The device
■ Automatic or Forced Mode Switching powers up in 1x mode and will automatically switch to ■ Internal Soft-Start Limits Inrush Current boost mode whenever any enabled LED current source ■ Short-Circuit/Thermal Protection begins to enter dropout. The fi rst dropout switches the ■ 3mm × 3mm 20-Lead QFN Plastic Package IC into 1.5x mode and a subsequent dropout switches
the LTC3219 into 2x mode. The part resets to 1x mode APPLICATIONS whenever a data register is updated via the I2C port. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
■ Video Phones with QVGA+ Displays
All other trademarks are the property of their respective owners. *Protected by U.S. Patents, including 6411531.
TYPICAL APPLICATION
4-LED Main, 2-LED Sub and RGB
MAIN SUB RGB
C1P C1M C2P C2M VBATVBAT CPO C1 C4 2.2μF LTC3219 2.2μF
I2C SCL/SDA ULED1-9
DVCC DVCC 3219 TA01a
ENABLE DISABLE ENU GND
3219fa
Page Summary Contents For LINEAR TECHNOLOGY LTC3219 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 216.52 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What operating temperature range does the LTC3219 support?
The device operates in a temperature range of -40°C to 85°C.
How is brightness adjusted for individual current sources?
Brightness control can be achieved via the I²C serial interface using internal 6-bit linear DACs for each source.
What does the LTC3219 automatically switch to during power fluctuations?
It optimizes efficiency by switching from 1x mode to 1.5x mode upon the first dropout, and then to 2x mode upon a subsequent dropout.
Is external soldering required for proper use?
Yes, the Exposed Pad (PIN 21) labeled 'IS' must be soldered to the PCB for grounding.