LEDs & Light Sources
36V, 2A Monolithic Synchronous Step-Down LED Driver with Silent Switcher Topology Minimizes EMI Concerns
Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LT3932, a monolithic, synchronous, step-down DC/DC converter with internal 36V, 2A power switches and an internal PWM generator. Its fixed frequency, peak current mode control accurately regulates current…
Summary of Features: LT3932
• ±1.5% LED Current Regulation
• ±1.2% Output Voltage Regulation
• 5000:1 PWM Dimming at 100 Hz
• 128:1 Internal PWM Dimming
• Spread Spectrum Frequency Modulation
• Silent Switcher® Architecture for Low EMI
• 3.6 V to 36 V Input Voltage Range
• 0 V to 36 V LED String Voltage
• 2 A, 36 V Internal Switches
• 200 kHz to 2 MHz with SYNC Function
• 99.9% Maximum Duty Cycle
• Analog or Duty Cycle LED Current Control
• Open/Short LED Protection & Fault Indication
• Accurate LED Current Sense with Monitor Output
• Programmable UVLO
• Thermally Enhanced 28-Lead (4×5 mm) QFN
The LT3932’s 3.6 V to 36 V input voltage range is ideal for a wide variety of applications, including automotive, industrial and architectural lighting. The combination of its Silent Switcher® topology and spread spectrum frequency modulation minimizes EMI concerns. The LT3932 can drive up to eight 2 A white LEDs from a nominal 32 V input, delivering in excess of 50 watts.
The LT3932 can deliver efficiencies of 93% while switching at 2 MHz, eliminating the need for external heat sinking and offering a tiny, compact solution footprint. Internal open/short LED protection and fault indication offers added reliability. The LT3932’s switching frequency is programmable from 200 kHz to 2 MHz or it can be synchronized to an external clock signal. Combined with a thermally enhanced 4x5 mm QFN package, the LT3932 offers a very compact high power LED driver solution. Other features include accurate LED current sense with a monitor output, 99.9% duty cycle operation and programmable UVLO.
The LT3932EUFD is available in a thermally enhanced 28-lead 4x5 mm QFN package. Three temperature grades are available, with operation from –40°C to 125°C (junction) for the extended, industrial grades and a high temperature grade of –40°C to 150°C. Quantities and all versions are available from stock.
For more information, go to www.linear.com/product/LT3932.
