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Analog Devices LT3909 | Demoboard DC2176A
LT3909 - 2-String × 50mA, 2MHz Step-Up LED Driver with ±1.8% Current Matching
Overview
| Topology | Boost Converter |
| Input voltage | 7-36 V |
| Switching frequency | 1880-2120 kHz |
| Output 1 | 35 V / 0.04 A |
| IC revision | A |
Description
Demonstration circuit 2176A features the LT®3909, a2-string × 50mA, 2MHz step-up LED driver with ±1.8%current matching.The LT3909 precisely regulates two LED strings for equalcurrent, supports LED dimming that reduces brightnessdown to a 1/40,000 ratio, protects against faults and alsoreports faults. The LT3909 consists of a step-up converterwith a fixed 2MHz switching frequency and current sourcesfor the LED strings.
Typical applications
- PDAs, Handheld Computers
- Automotive Displays
- High Contrast Instrument Clusters
- GPS Receivers