LTC1148CS-5
发布时间：2018/6/16
概述
The LTC1148CS-5 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 LTC1148CS-5 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.
特点
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
Applications
Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
Cellular Telephones
DC Power Distribution Systems
GPS Systems
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