LP5569 datasheet(11/93 Pages) TI2

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LP5569

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SNVSAP8A – JULY 2017 – REVISED SEPTEMBER 2017

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8 Detailed Description

8.1 Overview

The LP5569 device is a fully integrated lighting management unit for producing lighting effects for various LED

applications. The LP5569 device includes all necessary power management, low-side current sinks, two-wire

serial I2C-compatible interface, and programmable LED engines. The overall maximum current for each of the

nine drivers is set with 8-bit resolution. The LP5569 device controls LED luminance with a pulse-width

modulation (PWM) scheme with a resolution of 12 bits at 20 kHz, which is achieved by using 3-bit dithering.

8.1.1 Programming

The LP5569 device provides flexibility and programmability for dimming and sequencing control. Each LED can

be controlled directly and independently through the serial interface, or LED drivers can be grouped together for

preprogrammed flashing patterns. The device has three independent program execution engines. Each engine

can control 1 to 9 LED driver outputs, but more than one engine cannot simultaneously control the same LED

driver output. Any engine can be used as the master fader for all three engines.

8.1.2 Energy Efficiency

An integrated 1× or 1.5× charge pump with adaptive control provides supply voltage for LEDs when operating

with low input voltage. Because the LED drivers are low-side sinks, some or all LEDs can be powered from an

external source if available. The LP5569 device has very low standby current and an automatic power-save

mode when the LEDs are inactive.

8.1.3 Protection Features

Protection features include power-on reset, charge-pump input-current limiter, thermal shutdown (TSD), and

undervoltage lockout (UVLO).

LP5569 数据表(PDF) 11 Page - Texas Instruments