Features and Benefits
- 2.7V to 5.5V Input Voltage Range
- No Inductors
- Li-Ion (3.6V) to 1.5V with 81% Efficiency
- Low Noise Constant Frequency Operation
- Output Voltages: 1.5V ±4%, 1.2V ±4%
- Output Current: 250mA
- Shutdown Disconnects Load from VIN
- Low Operating Current: IQ = 35µA
- Low Shutdown Current: ISD <1µA
- Oscillator Frequency = 1.5MHz
- Soft-Start Limits Inrush Current at Turn-On
- Short-Circuit and Overtemperature Protected
- Low Profile (1mm) ThinSOT Package
The LTC3250-1.5/LTC3250-1.2 are charge pump step-down DC/DC converters that produce a 1.5V or 1.2V regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve typical efficiency two times higher than that of a linear regulator. No inductors are required.
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 filtering to further reduce conducted noise. The part also uses Burst Mode® operation to improve efficiency at light loads.
Low operating current (35µA with no load, <1µA in shutdown) and low external parts count (three small ceramic capacitors) make the LTC3250-1.5/LTC3250-1.2 ideally suited for space constrained battery powered applications. The parts are short-circuit and over-temperature protected, and are available in a low profile (1mm) 6-pin ThinSOT™ package.
*U.S. Patent #6, 411, 531
- Handheld Computers
- Cellular Phones
- Digital Cameras
- 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 (1)
Demonstration circuit 488 is a high efficiency, inductorless step-down converter featuring the LTC3250-1.5. The circuit produces a fixed 1.5V output from a 3.1V to 5.5V input.
Documentation & Resources
R415 Reliability Data3/23/201825 K
DC488A - Demo Manual9/24/2009434K
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
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|
|LTC3250ES6-1.2#TRMPBF||Material Declaration||Reliability Data||6-Lead TSOT-23|
|LTC3250ES6-1.2#TRPBF||Material Declaration||Reliability Data||6-Lead TSOT-23|
|LTC3250ES6-1.5#TRMPBF||Material Declaration||Reliability Data||6-Lead TSOT-23|
|LTC3250ES6-1.5#TRPBF||Material Declaration||Reliability Data||6-Lead TSOT-23|
|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.