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 ModeTM 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.

FEATURES
■ 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
■ 200kHz 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

APPLICATIONS
■ Notebook and Palmtop Computers, PDAs
■ Cellular Telephones and Wireless Modems
■ Battery-Operated Digital Devices
■ DC Power Distribution Systems
■ Battery Chargers