Analog Devices Inc. MAX20444B 4-Channel Backlight Driver ICs
Analog Devices Inc. MAX20444B 4-Channel Backlight Driver ICs feature a boost controller for automotive displays. The MAX20444B ICs have integrated current outputs that can sink up to 130mA LED current each. The devices accept a wide 4.5V to 36V input voltage range. The ICs can withstand direct automotive load-dump events. The internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in the 400kHz to 2.2MHz frequency range. Integrated spread spectrum helps reduce EMI. An adaptive output-voltage control scheme minimizes power dissipation in the LED current-sink paths.
Features
- Wide voltage-range operation
- Operates down to 4V supply after startup
- Survives load dumps up to 52V
- High integration
- Complete 4-channel solution including boost controller
- I2C control for minimum parts count
- Robust and low EMI
- Spread-spectrum oscillator
- Phase shifting
- 400kHz to 2.2MHz switching-frequency range
- Fail-safe operation mode using the FSEN pin
- Versatile dimming scheme allows hybrid or PWM-only dimming using DIM input or I2C
- Dimming Ratio > 10,000:1 using hybrid dimming
- 10,000:1 dimming ratio at 200Hz using PWM dimming
- Complete diagnostics
- LED open/short detection and protection
- Boost output undervoltage and overvoltage
- Boost-voltage measurement
- LED-current measurement
- Thermal shutdown
- Compact (4mm x 4mm) 24-pin TQFN and SWTQFN packages
Applications
- Infotainment displays
- Central information displays
- Instrument clusters
Typical Application Circuit
Development Tools
Analog Devices Inc. MAX20444B Evaluation Kit
Used to demonstrate the MAX20444B integrated, 4-channel, high-brightness LED driver.
Publicado: 2020-12-15
| Actualizado: 2024-08-05