Features and Benefits
- Greatly Reduced Conducted and Radiated EMI
- Low Switching Harmonic Content
- Independent Control of Output Switch Voltage and Current Slew Rates
- Greatly Reduced Need for External Filters
- Single N-Channel MOSFET Driver
- 20kHz to 250kHz Oscillator Frequency
- Easily Synchronized to External Clock
- Regulates Positive and Negative Voltages
- Easier Layout Than with Conventional Switchers
The LT1738 is a switching regulator controller designed to lower conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by controlling the voltage and current slew rates of an external N-channel MOSFET switch. Current and voltage slew rates can be independently set to optimize harmonic content of the switching waveforms vs efficiency. The LT1738 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency.
The LT1738 utilizes a current mode architecture optimized for single switch topologies such as boost, flyback and Cuk. The IC includes gate drive and all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics.
Protection features include gate drive lockout for low VIN, soft-start, output current limit, short-circuit current limit-ing, gate drive overvoltage clamp and input supply undervoltage lockout.
- Power Supplies for Noise Sensitive Communication Equipment
- EMI Compliant Offline Power Supplies
- Precision Instrumentation Systems
- Isolated Supplies for Industrial Automation
- Medical Instruments
- Data Acquisition Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
R303 Reliability Data3/23/2018
DC514A - Demo Manual9/24/2009
Two New Switching Regulators Deliver Both Power and Ultralow Noise9/1/2001 LT Journal
Tools & Simulations
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Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LT1738EG#PBF||Material Declaration||Reliability Data||20-Lead SSOP|
|LT1738EG#TRPBF||Material Declaration||Reliability Data||20-Lead SSOP|
|LT1738IG#PBF||Material Declaration||Reliability Data||20-Lead SSOP|
|LT1738IG#TRPBF||Material Declaration||Reliability Data||20-Lead SSOP|
|Wafer Fabrication Data||R303 Reliability Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.