36V, 2A synchronous step-down automotive LED driver minimizes EMI
The part’s 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. The LT3932’s 3.6V to 36V input voltage range suits 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 2A white LEDs from a nominal 32V input, delivering in excess of 50W.
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 4 x 5 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.
In a thermally enhanced 28-lead 4 x 5 mm QFN package, pricing starts at $3.95 (1000).
Analog Devices/Linear Technology; www.linear.com/product/LT3932
next page; feature summary….
Summary of Features: LT3932
±1.5% LED Current Regulation
±1.2% Output Voltage Regulation
5000:1 PWM Dimming at 100Hz
128:1 Internal PWM Dimming
Spread Spectrum Frequency Modulation
Silent Switcher® Architecture for Low EMI
3.6V to 36V Input Voltage Range
0V to 36V LED String Voltage
2A, 36V Internal Switches
200kHz to 2MHz 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 (4mm × 5mm) QFN
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