LP8555 Texas instruments

LP8555

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LP8555

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Описание

The LP8555 is a high efficiency LED driver with integrated dual DC-DC boost converters. It has 12 high-precision current sinks that can be controlled by a PWM input signal, an I2C master, or both. Dual-boost configuration of LP8555 shares the load to two inductors and allows thinner overall solution size and better efficiency compared to single-boost solutions. 12 LED strings allows driving high number of LEDs with optimal efficiency since boost conversion ratio can be kept low. The boost converter has adaptive output voltage control based on the LED current sink headroom voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions. The LED string auto-detect function enables use of the same device in systems with 2 to 12 LED strings for the maximum design flexibility. Proprietary Hybrid PWM and Current dimming mode enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors. Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.

Dual High-Efficiency DC/DC Boost Converters
2.7-V to 20-V VDD Range
12 50-mA High-Precision LED Current
Sinks With 12-Bit Brightness Control
Adaptive LED Current Sink Headroom
Controls for Maximum System Efficiency
LED String Count Auto-Detection
Phase-Shifted PWM Mode for Reduced Audible
Noise
PWM Input Duty-Cycle and/or I²C-Register
Brightness Control
Hybrid PWM and Current Dimming for Higher LED
Drive Optical Efficiency
Flexible CABC Support
EPROM, I²C-Register, or External Resistors
for Configuration
Improved Boost EMI Performance with Slew-Rate Control,
Spread Spectrum, and Phase-Shifted Switching
Extensive Fault Detection Schemes

Number of channels	12
Vin (min) (V)	2.7
Vin (max) (V)	20
Vout (min) (V)	7
Vout (max) (V)	28
Type	Inductive
Switching frequency (max) (kHz)	1000
Duty cycle (max) (%)	100
LED current per channel (mA)	50
Peak efficiency (%)	93
Topology	Boost
Features	Adjustable Switch Frequency, Analog/PWM mixed dimming, CABC, Edge Rate Control, I2C control, Integrated Switch, OVP, PWM control, Thermal shutdown
Operating temperature range (°C)	-40 to 85
Rating	Catalog