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Texas Instruments LP5861T High-Current LED Driver

Texas Instruments LP5861T 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 LP5861T is the direct driving version to support 18 LED dots or 6 RGB LEDs.

The LP5861T 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 LP5861T 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 LP5861T also supports LED open and short detection functions. Both 1MHz (maximum) I²C and 12MHz (maximum) SPI are available in LP5861T.

Features

Operating voltage range
- V_CC/V_LED range of 2.7V to 5.5V
- Logic pins compatible with 1.8V, 3.3V, and 5V
Flexible dimming options
- Individual ON/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 high current and precision constant current sinks
- 125mA 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 ≤ 2µA 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 and 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
- 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 LP5861T High-Current LED Driver

Features

Applications

Simplified Schematic

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