Dual-channel DC/DC LED controller drives two strings of high-current LEDs using fixed-frequency current-mode control. The controller supports 5 V to 60 V input operation and rail-to-rail LED current sensing from 0 V to 120 V. Internal exponential PWM dimming provides 128 precision dimming ratios, and external PWM dimming supports ratios up to 20000:1 at 100 Hz. The device provides constant-current and constant-voltage regulation with LED short and open protection in a side-solderable 28-lead 4 mm × 5 mm QFN package.
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| Controller channels | 2 |
| Input voltage range | 5 to 60V |
| Output current sensing range | 0 to 120V |
| Internal exponential PWM dimming | 128:1 |
| External PWM dimming ratio | 20000:1 at 100 Hz |
| LED current regulation accuracy | ±2% |
| Output voltage regulation accuracy | ±2% |
| Switching frequency range | 100 to 2000kHz |
| Dimming control | Independent channel dimming |
| Protection features | LED short/open protection and indication |
| Package leads | 28 |
| Package size | 4 × 5mm |
| Automotive qualification | AEC-Q100 |
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These are design resources that include the Analog Devices LT8355IUFDM-1#WPBF
Evaluation board for the LT8355-1, a 60V dual LED controller featuring boost and buck-boost channels, SSFM for low EMI, and multiple dimming options.
