LTC1624 - High Efficiency SO-8 N-Channel Switching Regulator Controller
特点
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N-Channel MOSFET Drive
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Implements Boost, Step-Down, SEPIC and Inverting Regulators
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Wide VIN Range: 3.5V to 36V Operation
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Wide VOUT Range: 1.19V to 30V in Step-Down Configuration
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±1% 1.19V Reference
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Low Dropout Operation: 95% Duty Cycle
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200kHz Fixed Frequency
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Low Standby Current
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Very High Efficiency
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Remote Output Voltage Sense
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Logic-Controlled Micropower Shutdown
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Internal Diode for Bootstrapped Gate Drive
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Current Mode Operation for Excellent Line and Load Transient Response
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Available in an 8-Lead SO Package
描述
The LTC®1624 is a current mode switching regulator controller that drives an external N-channel power MOSFET using a fixed frequency architecture. It can be operated in all standard switching configurations including boost, step-down, inverting and SEPIC. Burst Mode™ operation provides high efficiency at low load currents. A maximum high duty cycle limit of 95% provides low dropout operation which extends operating time in battery-operated systems. The operating frequency is internally set to 200kHz, allowing small inductor values and minimizing PC board space. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 36V (absolute maximum). A multifunction pin (ITH/RUN) allows external compensation for optimum load step response plus shutdown. Soft start can also be implemented with the ITH/RUN pin to properly sequence supplies.
应用
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Notebook and Palmtop Computers, PDAs
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Cellular Telephones and Wireless Modems
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Battery-Operated Digital Devices
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DC Power Distribution Systems
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Battery Chargers
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