Analog Devices LT3942

Description

As the size of electronic devices shrink, the circuitry inside them must do the same. This trend towards product miniaturization is evident across all industries and creates new design challenges for engineers tasked with fitting solutions in space-constrained designs. To meet increasingly stringent size requirements for compact electronic devices, integrated circuit (IC) designers bring external components inside of their devices to minimize the external component count. Of the various circuits required to build any electronic device, dc-to-dc converters are as challenging to shrink in size as they are ubiquitous—everything needs power—as power supply designers often face the reality that shrinking solution size typically negatively affects performance. For instance, one way to save significant PCB real estate is to use a monolithic dc-to-dc converter that integrates carefully selected power switch devices within the IC package, reducing required external components to a few passive devices. In many cases, the resulting compact design brings the undesirable result of increased power loss in a smaller space for much higher temperature rise when compared with external power switch controller designs. Selecting the right monolithic dc-to-dc converter is critical in designing a power system that is both compact and efficient in order to avoid generating problematic levels of heat

Features

• 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
• Proprietary Peak-Buck Peak-Boost Current Mode
• 3V to 36V Input Voltage Range
• 0V to 36V Output Voltage Range
• ±1.5% Output Voltage Regulation
• ±3% LED Current Regulation
• 5000:1 External and 128:1 Internal PWM Dimming
• Rail-to-Rail LED Current Sense and Monitor Output
• Open and Short LED Protection with Fault Reporting
• 300kHz to 2MHz Fixed Switching Frequency with External Frequency Synchronization
• Flicker-Free Spread Spectrum for Low EMI
• Available in 28-Lead QFN (4mm × 5mm)

More information

• Datasheet
• IC product information