Components | Electronics | Driver IC | Automotive | Jul 12, 2017

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 within ±1.5% for strings of up to 2A LEDs. Its integrated PWM generator offers a 128:1 dimming ratio. If dimming ratios of up to 5000:1 are required, the LT3932 and an external PWM generator can accommodate these applications.

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.
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