LTC1624 Datasheet | Linear Technology

LTC1624 High Efficiency SO-8 N-Channel Switching Regulator Controller Features s s DESCRIPTION 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 TM 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 200k Hz, 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 (I TH / RUN) allows external pensation for optimum load step response plus shutdown. Soft start can also be implemented with the ITH /RUN pin to properly sequence supplies. s s s s s s s s s s s s N-Channel MOSFET Drive Implements Boost, Step-Down, SEPIC and Inverting Regulators Wide VIN Range: 3.5V to 36V Operation Wide VOUT Range: 1.19V to 30V in Step-Down Configuration ± 1% 1.19V Reference Low Dropout Operation: 95% Duty Cycle 200k Hz Fixed Frequency Low Standby Current Very High Efficiency Remote Output Voltage Sense Logic-Controlled Micropower Shutdown Internal Diode for Bootstrapped Gate Drive Current Mode Operation for Excellent Line and Load Transient Response Available in an 8-Lead SO Package U APPLICATIONS s s s s s Notebook and Palmtop puters, PDAs Cellular Telephones and Wireless Modems Battery-Operated Digital Devices DC Power Distribution Systems Battery Chargers , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. TYPICAL APPLICATION 1000p F SENSE - ITH /RUN VFB 100p F GND SW VIN BOOST TG VIN 4.8V TO 28V RSENSE 0.05Ω M1...