1 Features
• Input voltage operating range 3 V to 48 V
• Six high-precision current sinks
– Up to 200-mA DC current for each current sink
– Current matching 1% (typical)
– Dimming ratio 32 000:1 using 152-Hz LED
output PWM frequency
– Up to 16-bit LED dimming resolution with I2C,
or PWM input
– 8 Configurable LED strings configuration
• Auto-phase shift PWM dimming
• 12-bit Analog dimming
• Switching frequency 100 kHz to 2.2 MHz
• Boost spread spectrum for reduced EMI
• Boost sync input to set boost switching frequency
from an external clock
• Up to 48-V VOUT boost or SEPIC DC/DC controller
– Switching frequency 100 kHz to 2.2 MHz
– Boost spread spectrum for reduced EMI
– Boost sync input to set boost switching
frequency from an external clock
• Extensive fault diagnostics

2 Applications
Backlight for:
• Monitor
• TV
• Medical displays
• Industrial backlighting systems in control panels
• Industrial PC
• Test and measurement equipment

3 Description
The TPS92391 is an automotive high-efficiency
LED driver with boost controller. The Six highprecision
current sinks support phase shifting that
is automatically adjusted based on the number of
channels in use. LED brightness can be controlled
globally through the I²C interface or PWM input.
The boost controller has adaptive output voltage
control based on the headroom voltages of the
LED current sinks. This feature minimizes the power
consumption by adjusting the boost voltage to the
lowest sufficient level in all conditions. A wide-range
adjustable frequency allows the TPS92391 to avoid
disturbance for AM radio band.
The TPS92391 supports built-in hybrid PWM dimming
and analog current dimming, which reduces EMI,
extends the LED lifetime, and increases the total
optical efficiency.