· LED topology: - AM 4 constant current sink, each current sink can support 1~10 LEDs
· Operating voltage range: - VCC range: 3.0V to 5.5V - Interface pin compatible with: 3.3V/5.0V - LED supply voltage range: up to 40V
· Constant current sinks with high precision: - 0.156~40mA per channel sink when VCC>3V - Device-to-device error: ±1.5% - Knee voltage:400mV in 20mA
· PWM dimming options: - Global 8-bits maximum current (GC) setting from 0.156mA~40mA
· PWM dimming control:12 bits
· Ultra-low quiescent current: - 100µA in standby mode. - 1.0mA in normal mode @40mA
· Automatic Voltage range detection for VLED Headroom voltage control.
· LED open (LOD)/ short (LSD) detection
· Over temperature detect and chip protection: - 120°C derating options - 150°C Shut down
· Programmable interface output ability for EMI
· Phase-shift PWM scheme.
· Two-wire interface compatible with common SPI, data transfer rate: 20MHz(max.)
· UART output for internal information readback.
· Interrupt output for system level ERROR information handle.
· ESD: 4000V HBM
The TMI9404 is a 4-channel, internal current sink, high precision, mini-LED backlighting driver for high dynamic range (HDR) LCD TVs, monitors and notebook displays. The device reports the voltage on the OUT pin to MCU to enable best system efficiency and thermal performance. The TMI9404 integrates the ability to used digital dimming methods in one device. With an 8-bit global and 12-bit PWM digital dimming, the device improved contrast ratio in HDR displays. The current sinks can drive up to 40mA per channel and have very tightly controlled current accuracy. A full array or protection circuits are integrated, including built-in LED open/short detection, over temperature protection and protection during both start-up and normal operation.
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