Synchronous step-up LED driver uses fixed-frequency peak current control to regulate a string of LEDs. It operates from a 2.8 V to 36 V input range and supports up to 34 V LED string voltage with 2.3 A, 40 V internal switches. The device provides ±2.5% LED current regulation, ±2% output voltage regulation, and 25,000:1 PWM dimming at 100 Hz. Switching frequency is programmable from 200 kHz to 2 MHz and can be synchronized externally. Protection features include open and short LED fault indication and thermal shutdown in a thermally enhanced 28-lead 4 mm × 5 mm QFN package.
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| Input Voltage Range | 2.8 to 36V |
| Maximum LED String Voltage | 34V |
| Internal Switch Current | 2.3A |
| Internal Switch Voltage Rating | 40V |
| LED Current Regulation | ±2.5% |
| Output Voltage Regulation | ±2% |
| External PWM Dimming Ratio | 25,000:1 at 100 Hz |
| Internal PWM Dimming Ratio | 128:1 |
| Switching Frequency Range | 200 to 2000kHz |
| Control Method | Analog voltage or duty-cycle LED current control |
| Operating Topologies | Boost, buck mode, and buck-boost mode |
| Protection Features | Open LED, short LED, fault indication, thermal shutdown |
| Package | 28-lead 4 mm × 5 mm thermally enhanced QFN |
| Operating Junction Temperature Range | −40 to 125 for E/I grades; −40 to 150 for H grade°C |
| Qualification | AEC-Q100 qualified automotive versions |
| Automotive Qualification | AEC-Q100 qualified for automotive applications |
| Lead Finish | Lead-free #PBF and tape-and-reel #TRPBF orderable models |
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These are design resources that include the Analog Devices LT3922-1
36V 2A synchronous 2MHz boost LED driver featuring the LT3922-1 with 25,000:1 PWM dimming, spread spectrum for low EMI, and support for LED strings up to 34V at 330mA.
