http://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Flp5868t”>View Datasheet

Texas Instruments LP5868T High-Current LED Driver

Texas Instruments LP5868T High-Current LED Driver integrates 18 constant current sinks with N (N = 6/8/11) switching MOSFETs to support N × 18 LED dots or N × 6 RGB LEDs. The LP5868T integrates eight MOSFETs for up to 144 LED dots or 48 RGB LEDs.

The LP5868T supports both analog dimming and PWM dimming methods. For analog dimming, each LED dot can be adjusted with 256 steps. The integrated 8-bit or 16-bit configurable PWM generators enable smooth and audible-noise-free dimming control for PWM dimming. Each LED dot can also be arbitrarily mapped into 8-bit Group PWM to achieve dimming control together.

The LP5868T device implements full addressable SRAM to minimize the data traffic. The ghost-cancellation circuitry is integrated to eliminate both upside and downside ghosting. The Texas Instruments LP5868T also supports LED open and short detection functions. Both 1MHz (maximum) I²C and 12MHz (maximum) SPI are available in LP5868T.

Features

LED matrix topology
- Six constant current sinks with seven scan switches for 42 LED dots
- Configurable for 1 to 7 scan switches
Operating voltage range
- V_CC/V_LED range: 2.7V to 5.5V
- Logic pins compatible with 1.8V, 3.3V, and 5V
18 constant current sinks with high precision
- 100mA per current sink when V_CC ≥ 3.3V
- ±5% device-to-device error
- ±5% channel-to-channel error
- Phase-shift for balanced transient power
Ultra-low power consumption
- Shutdown mode: I_CC ≤ 1µA when EN = Low
- Standby mode: I_CC ≤ 10µA when EN = High and CHIP_EN = 0 (data retained)
- Active mode: I_CC = 5mA (typical) when channel current = 12.5mA
Full addressable SRAM to minimize data traffic
Individual LED dot open/short detection

Flexible dimming options
- Individual ON/OFF control for each LED dot
- Analog dimming (current gain control)
  - Global 7-step 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
De-ghosting 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
- Major and smart home appliances
- Global RGB keyboard backlighting
- Outdoor keypad backlighting
- IR module for video surveillance and IP camera
- Laser diode in optical module

Texas Instruments LP5868T High-Current LED Driver

Features

Applications

Simplified Schematic

husseinkey ELECTRONICS®

COMPANY