Features and Benefits
- Ultra-High Efficiency: Over 95% Possible
- Current-Mode Operation for Excellent Line and Load Transient Response
- High Efficiency Maintained Over Three Decades of Output Current
- Low 160µA Standby Current at Light Loads
- Logic Controlled Micropower Shutdown: IQ <20µA
- Wide VIN Range: 3.5V to 20V
- Short-Circuit Protection
- Very Low Dropout Operation: 100% Duty Cycle
- Synchronous FET Switching for High Efficiency
- Adaptive Nonoverlap Gate Drives
- Output Can Be Externally Held High in Shutdown
- Available in 14-Pin Narrow SO Package
The LTC1148 series is a family of synchronous stepdown 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 providing constant ripple current in the inductor.
The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 18V (20V maximum). Constant off-time architecture provides low dropout regulation limited by only the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor.
The LTC1148 series combines synchronous switching for maximum efficiency at high currents with an automatic low current operating mode, called Burst Mode operation, which reduces switching losses. Standby power is reduced to only 2mW at VIN = 10V (at IOUT = 0). Load currents in Burst Mode operation are typically 0mA to 300mA.
For operation up to 48V input, see the LTC1149 and LTC1159 data sheets and Application Note 54.
- Notebook and Palmtop Computers
- Portable Instruments
- Battery-Operated Digital Devices
- Cellular Telephones
- DC Power Distribution Systems
- GPS 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.
Documentation & Resources
R245 Reliability Data3/22/2018
DN82 - 5V to 3.3V Regulator with Fail-Safe Switchover3/26/2014
DN68 - New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency3/21/2014
DN91 - 5V to 3.3V Circuit Collection3/21/2014
DN90 - High Efficiency Power Sources for Pentium TM Processors3/21/2014
Design Note 103: New LTC1266 Switching Regulator Provides High Efficiency at 10A Loads5/1/1995
Design Note 74: Techniques for Deriving 3.3V from 5V Supplies9/1/1993
Design Note 72: Single LTC1149 Delivers 3.3V and 5V at 17W7/1/1993
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