 The LT3791 is a synchronous 4-switch buck-boost LED driver and voltage regulator
controller. The controller operates from input voltages above, below, or equal to the
output voltage. The LT3791 has a wide 4.7V to 60V input and 0V to 60V output range
along with seamless transitions between operating modes. A ground reference voltage
FB pin serves as the input for several LED protection features and also makes it possible
for the converter to operate as a constant-voltage source. The LT3791 is ideal for a wide
variety of applications.
The LT3791 runs in forced continuous mode, which is ideal for systems with
stringent EMI requirements. Fault protection is provided to survive and report an open or
shorted LED condition. A timer allows the LT3791 to continue to run, latch off or restart
when a fault occurs.
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Features
- 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
- Wide VIN Range: 4.7V to 60V
- Wide VOUT Range: 0V to 60V (55V LED)
- ±2% Output Voltage Accuracy
- Synchronous Switching: Up to 98.5% Efficiency
- ±6% LED Current Accuracy: 0V ≤ VOUT < 60V
- VOUT Disconnected from VIN During Shutdown
- Accurate Rail-to-Rail LED Current Sense with Monitor Output
- Input Current Sense with Monitor Output
- PWM and Analog Dimming
- Capable of 100W or greater per IC
- 38-Lead TSSOP with Exposed Pad
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Applications
- Automotive Headlamps / Running Lamps
- General Purpose Lighting
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