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Texas Instruments LP5868 8×18 LED Matrix Driver

Texas Instruments LP5868 8×18 LED Matrix Driver integrates 8 MOSFETs for up to 144 LED dots or 48 RGB LEDs. The LP5868 supports both analog dimming and PWM dimming methods. For analog dimming, each LED dot can be adjusted with 256 steps. For PWM dimming, the integrated 8-bit or 16-bit configurable PWM generators enable smooth and audible-noise-free dimming control. Each LED dot can also be arbitrarily mapped into 8-bit group PWM to achieve dimming control together.

The Texas Instruments LP5868 implements full addressable SRAM to minimize the data traffic. The ghost-cancellation circuitry is integrated to eliminate both upside and downside ghosting. The LP5868 also supports LED open and short detection functions. Both 1MHz (maximum) I²C and 12MHz (maximum) SPI are available in LP5868.

Features

LED matrix topology
- 18 constant current sinks with eight scan switches for 144 LED dots
- Configurable for 1 to 8 scan switches
Operating voltage range:
- V_CC/VLED range: 2.7V to 5.5V
- Logic pins compatible with 1.8V, 3.3V, and 5V
Flexible dimming options
- Individual ON and OFF control for each LED dot
- Analog dimming (current gain control)
  - Global 3-bit Maximum Current (MC) setting for all LED dots
  - Three groups of 7-bit Color Current (CC) settings for red, green, and blue
  - Individual 8-bit Dot Current (DC) setting for each LED dot
- PWM dimming with audible-noise-free frequency
  - Global 8-bit PWM dimming for all LED dots
  - Three programmable groups of 8-bit PWM dimming for LED dot arbitrary mapping
  - Individual 8-bit or 16-bit PWM dimming for each LED dot

18 constant current sinks with high precision
- 0.1mA–50mA per current sink when V_CC ≥ 3.3V
- Device-to-device error: ±3% when channel current = 50mA
- Channel-to-channel error: ±3% when channel current = 50mA
- Phase-shift for balanced transient power
Ultra-low power consumption
- Shutdown mode: I_CC ≤ 1uA when EN = Low
- Standby mode: I_CC ≤ 10uA when EN = High and CHIP_EN = 0 (data retained)
- Active mode: I_CC = 4.3mA (typ.) when channel current = 5mA
Full addressable SRAM to minimize data traffic
Individual LED dot open/short detection
Deghosting and low brightness compensation
Interface options
- 1MHz (max.) I²C interface when IFS = Low
- 12MHz (max.) SPI interface when IFS = High

Applications

LED animation and indication for
- Keyboard, mouse, and gaming accessories
- Major and smart home appliances
- Smart speaker, wired and wireless speaker
- Audio mixer, DJ equipment, and broadcast
- Access equipment, switches, and servers
Constant current sinks for optical module

Texas Instruments LP5868 8×18 LED Matrix Driver

Features

Applications

Simplified Schematic

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