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LT1941: Triple Monolithic Switching Regulator Data Sheet5/4/2009PDF231K
Overview
Features and Benefits
- Wide Input Range: 3.5V to 25V
- Three Switching Regulators with Internal Power Switches: 3A Step-Down, 2A Step-Down, 1.5A Inverting/Boost
- Antiphase Switching Reduces Ripple
- Independent Shutdown/Soft-Start Pins
- Independent Power Good Indicators Ease Supply Sequencing
- Input Voltage Power Good Indicators Monitor Input Supply
- Uses Small Inductors and Ceramic Capacitors
- Constant 1.1MHz Switching Frequency
- Thermally Enhanced 28-Lead TSSOP Package
Product Details
The LT1941 is a triple current mode DC/DC converter with internal power switches. Two of the regulators are step-down converters with 3A and 2A power switches. The third regulator can be configured as a boost, inverter or SEPIC converter and has a 1.5A power switch. All three converters are synchronized to a 1.1MHz oscillator. The two step-down converters run with opposite phase, reducing input ripple current. The output voltages are set with external resistor dividers and each regulator has independent shutdown and soft-start circuits. Each regulator generates a power good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs.
The high switching frequency offers several advantages by permitting the use of small inductors and ceramic capacitors, leading to a very small triple output solution. The constant switching frequency, combined with low impedance ceramic capacitors, result in low, predictable output ripple. With its wide input voltage range of 3.5V to 25V, the LT1941 regulates a broad array of power sources from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed-power supplies.
Applications
- Cable Modems
- DSL Modems
- Distributed Power Regulation
- Wall Transformer Regulation
- Disk Drives
- DSP Power
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
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R365 Reliability Data3/23/2018PDF19 K
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DC621A - Demo Manual9/24/2009PDF361K
Tools & Simulations
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LT1941
Design Resources
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 |
|---|---|---|---|---|
| LT1941EFE#PBF | Material Declaration | Reliability Data | 28-Lead TSSOP w/ EP | |
| LT1941EFE#TRPBF | Material Declaration | Reliability Data | 28-Lead TSSOP w/ EP | |
| Wafer Fabrication Data | R365 Reliability Data |
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Lead Times
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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.