Datasheet Analog Devices LT3922HUFD#PBF — Datenblatt

LT3922
36V, 2A Synchronous
Step-Up LED Driver
Features Description ±2% LED Current Regulation
nn ±2% Output Voltage Regulation
nn 5000:1 PWM Dimming at 100Hz
nn 128:1 Internal PWM Dimming
nn Spread Spectrum Frequency Modulation
nn Silent Switcher® Architecture for Low EMI
nn Operates in Boost, Buck Mode and Buck-Boost Mode
nn 2.8V to 36V Input Voltage Range
nn Up to 34V LED String Voltage
nn 2A, 40V Internal Switches
nn 200kHz to 2MHz with SYNC Function
nn Analog or Duty Cycle LED Current Control
nn Open/Short LED Protection and Fault Indication
nn Thermally Enhanced 28-Lead (4mm × 5mm) QFN The LT®3922 is a monolithic, synchronous, step-up DC/
DC converter that utilizes fixed-frequency, peak current
control and provides PWM dimming for a string of LEDs.
The LED current is programmed by an analog voltage or
the duty cycle of pulses at the CTRL pin. The LT3922 will
maintain ±2% current regulation through an external sense
resistor over a wide range of output voltages. nn The switching frequency is programmable from 200kHz …