Features and Benefits
- Operation to 48V Input Voltage
- Ultrahigh Efficiency: Up to 95%
- Current Mode Operation for Excellent Line and Load Transient Response
- High Efficiency Maintained over Wide Current Range
- Logic-Controlled Micropower Shutdown
- Short-Circuit Protection
- Very Low Dropout Operation: 100% Duty Cycle
- Synchronous FET Switching for High Efficiency
- Adaptive Nonoverlap Gate Drives
- Available in 16-Pin Narrow SO Package
The LTC1149 series is a family of synchronous step down switching regulator controllers featuring automatic Burst Mode™ operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.
Special onboard regulation and level-shift circuitry allow operation at input voltages from dropout to 48V (60V absolute max). The constant off-time architecture maintains constant ripple current in the inductor, easing the design of wide input range converters. Current mode operation provides excellent line and load transient response. The operating current level is user-programmable via an external current sense resistor.
The LTC1149 series incorporates automatic power saving Burst Modeoperation when load currents drop below the level required for continuous operation. Standby power is reduced to only about 8mW at VIN = 12V. In shutdown, both MOSFETs are turned off.
- Notebook and Palmtop Computers
- Portable Instruments
- Battery-Operated Digital Devices
- Industrial Power Distribution
- Avionics Systems
- Telecom Power 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.
Documentation & Resources
R245 Reliability Data3/22/2018
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|
|LTC1149CN#PBF||Material Declaration||Reliability Data||16-Lead PDIP (Narrow 0.30 Inch)|
|LTC1149CN-3.3#PBF||Material Declaration||Reliability Data||16-Lead PDIP (Narrow 0.30 Inch)|
|LTC1149CN-5#PBF||Material Declaration||Reliability Data||16-Lead PDIP (Narrow 0.30 Inch)|
|LTC1149CS#PBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|LTC1149CS#TRPBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|LTC1149CS-3.3#PBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|LTC1149CS-3.3#TRPBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|LTC1149CS-5#PBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|LTC1149CS-5#TRPBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|Wafer Fabrication Data||R245 Reliability Data|
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