DESCRIPTION
The LTC®1875 is a high efficiency 1.5A monolithic synchronous buck regulator using a constant frequency, current mode architecture. Operating supply current is only 15µA with no load and drops to <1µA in shutdown. The input supply voltage range of 2.65V to 6V makes the LTC1875 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.

FEATURES
■ High Efficiency: Up to 95%
■ Low Quiescent Current: Only 15µA with No Load
■ 550kHz Constant Frequency Operation
■ 2.65V to 6V Input Voltage Range
■ VOUT from 0.8V to VIN, IOUT to 1.5A
■ True PLL Frequency Locking from 350kHz to 750kHz
■ Power Good Output Voltage Monitor
■ Low Dropout Operation: 100% Duty Cycle
■ Burst Mode® or Pulse Skipping Operation
■ Current Mode Operation for Excellent Line and Load Transient Response
■ Shutdown Mode Draws <1µA Supply Current
■ ±2% Output Voltage Accuracy
■ Overcurrent and Overtemperature Protected
■ Available in 16-Lead SSOP Package

APPLICATIONS
■ Portable Computers
■ Portable Instruments
■ Wireless Modems