概览
优势和特点
- 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
产品详情
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.
Applications
- Notebook and Palmtop Computers
- Portable Instruments
- Battery-Operated Digital Devices
- Cellular Telephones
- DC Power Distribution Systems
- GPS Systems
产品分类
产品生命周期
量产
该产品系列中至少有一个型号已量产并可供采购。该产品适合用于新设计，但也可能有更新的替代产品。
评估套件 (3)
参考资料
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R245 Reliability Data3/22/2018PDF21 K
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AN66 - Linear Technology Magazine Circuit Collection, Volume II8/20/2007PDF1M
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AN60 - PCMCIA Card and Card Socket Power Management:8/20/2007PDF253K
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AN54 - Power Conversion from Milliamps to Amps at Ultra-High Efficiency (Up to 95%)8/20/2007PDF454K
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AN51 - Power Conditioning for Notebook and Palmtop Systems8/20/2007PDF253K
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DN82 - 5V to 3.3V Regulator with Fail-Safe Switchover3/26/2014PDF72K
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DN68 - New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency3/21/2014PDF79K
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DN91 - 5V to 3.3V Circuit Collection3/21/2014PDF71K
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DN90 - High Efficiency Power Sources for Pentium TM Processors3/21/2014PDF83K
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Design Note 103: New LTC1266 Switching Regulator Provides High Efficiency at 10A Loads5/1/1995
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Design Note 74: Techniques for Deriving 3.3V from 5V Supplies9/1/1993
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Design Note 72: Single LTC1149 Delivers 3.3V and 5V at 17W7/1/1993
工具及仿真模型
LTspice中提供以下器件型号：
LTC1148
LTC1148-3.3
LTC1148-5
LTC1148HV
LTC1148HV-3.3
LTC1148HV-5
LTC1148L
LTC1148L-3.3
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