Analog Devices announces the Power by Linear LT3762, a 60V output, high efficiency, synchronous, boost LED driver controller with a programmable internal LED PWM signal generator and spread spectrum frequency modulation that yield low EMI noise. The versatile LT3762 includes a rail-to-rail current sense amplifier, enabling high side or low side current sensing that in addition to synchronous boost facilitates synchronous buck-mode and buck-boost mode topologies and nonsynchronous SEPIC designs.
- View the LT3762 product page, download data sheet, order samples and evaluation boards: http://www.analog.com/LT3762
The LT3762’s 2.5V to 38.5V input voltage range and synchronous operation is ideal for automotive power systems, portable instruments, industrial applications, medical instruments and architectural lighting. An auxiliary on-chip buck-boost converter provides the necessary gate drive voltage in low voltage systems, and when combined with a low 500µA maximum quiescent current and 1µA shutdown current (TA = 25°C), results in high efficiency over wide input voltage and output current ranges.
In systems where EMI is a concern, the LT3762’s optional spread spectrum frequency modulation can be enabled to reduce the effective switching frequency noise. An on-chip PWM signal generator is synchronized to the internal oscillator for lowest noise performance. Internal PWM generation provides 250:1 dimming; external 3000:1 dimming or analog dimming can also be employed.
Other features of the constant current and constant voltage LT3762 include current mode operation with cycle-by-cycle current limiting, adjustable 100kHz to 1MHz switching, programmable undervoltage lockout, open LED and short-circuit protection with fault status indicators, LED overcurrent protection and thermal shutdown.
The LT3762 is available in thermally enhanced 28-lead TSSOP and 4mm x 5mm QFN packages. Three temperature grades are available, with operation from –40°C to 125°C (junction) for the extended and industrial grades, and a high temperature grade of –40°C to 150°C. For more information, visit www.analog.com/LT3762.
Summary of Features: LT3762
- Synchronous Controller for Highest Efficiency
- 500µA Maximum Quiescent Current and 1µA Shutdown Current (TA = 25°C)
- Optional Spread Spectrum Frequency Modulation for Low EMI
- Internal 250:1 PWM Signal Generator