DESCRIPTION
The TK653xx mid power step-down converter is designed for portable battery powered systems, capable of operating from single Li-ion battery cells or two NiCad battery cells. The TK653xx provides the power switch, synchronous rectifier, and the control circuit for a buck step-down converter. Only three external components are required to complete the step-down conversion.

FEATURES
■ Very Low Quiescent Current (10 µA)
■ Extremely Low Operating Current (25 µA)
■ Internal Battery Monitor
■ Regulates Down to 1.8 V
■ Short Circuit Protection
■ Synchronous Rectification
■ Up To 95% Efficient

APPLICATIONS
■ Battery Powered System
■ Cellular Telephones
■ Pagers
■ Personal Communications Equipment
■ Radio Controlled Systems
■ Toys