Features and Benefits
- Low Noise Constant Frequency Operation
- 2.7V to 5.5V Input Voltage Range
- No Inductors
- Typical Efficiency 25% Higher Than LDOs
- Shutdown Disconnects Load from VIN
- Output Voltage: 1.8V ±4% or 1.5V ±4%
- Output Current: 250mA
- Low Operating Current: IIN = 180µA Typ
- Low Shutdown Current: IIN = 10µA Typ
- Oscillator Frequency: 1.5MHz
- Soft-Start Limits Inrush Current at Turn On
- Short-Circuit and Overtemperature Protected
- Available in an 8-Pin MSOP Package
The LTC1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary. Typical efficiency is over 25% higher than that of a linear regulator.
A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (fOSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency,the part enters Burst Mode® operation under light load conditions.
Low operating current (180µA with no load, 10µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make the LTC1911 ideally suited for space constrained battery powered applications. The part is short-circuit and over temperature protected, and is available in an 8-pin MSOP package.
- Handheld Computers
- Cellular Phones
- Smart Card Readers
- Portable Electronic Equipment
- Handheld Medical Instruments
- Low Power DSP Supplies
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 (2)
DC342A-B: Demo Board for the LTC1911 Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter.
Documentation & Resources
R415 Reliability Data3/23/2018
DC342A - Demo Manual9/24/2009
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|
|LTC1911EMS8-1.5#PBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1911EMS8-1.5#TRPBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1911EMS8-1.8#PBF||Material Declaration||Reliability Data||8-Lead MSOP|
|LTC1911EMS8-1.8#TRPBF||Material Declaration||Reliability Data||8-Lead MSOP|
|Wafer Fabrication Data||R415 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.