Linear Technology/Analog Devices LT3922HUFD#PBF 2A Synchronous Step-Up LED Drivers are monolithic converters with a fixed-frequency, peak current control and PWM dimming for a string of LEDs. The LT3922HUFD#PBF can operate in boost, buck or buck-boost modes. The LED current is programmed by an analog voltage or the duty cycle of pulses at the CTRL pin. The LT3922HUFD#PBF will maintain �2% current regulation through an external sense resistor over a wide range of output voltages.
Feature
- ±2% LED Current Regulation
- ±2% Output Voltage Regulation
- 5000:1 PWM Dimming at 100Hz
- 128:1 Internal PWM Dimming
- Spread-Spectrum Frequency Modulation
- Silent Switcher® Architecture for Low EMI
- Operates in Boost, Buck Mode and Buck-Boost Mode
- 2.8V to 36V Input Voltage Range
- Up to 34V LED String Voltage
- 2A, 40V Internal Switches
- 200kHz to 2MHz with SYNC Function
- Analog or Duty Cycle LED Current Control
- Open/Short LED Protection and Fault Indication
- Thermally Enhanced 28-Pin (4mm × 5mm) QFN
Applications
- Automotive and Industrial Lighting
- Machine Vision
