DESCRIPTION
The TK654xx low power step-down converter is designed for portable battery systems, capable of operating from a single Li-ion battery cell or multiple alkaline or rechargeable (NiCd or NiMH) battery cells (up to 6 V). The TK654xx provides the power switch, synchronous rectifier, and the control circuit for a buck step-down converter. Only two external components are required to complete the stepdown conversion.

FEATURES
■ Minimum External Component Count (1 coil, 1 cap)
■ Miniature 6 Pin SOT23L-6 Surface Mount Package
■ Up To 95% Efficient
■ Extremely Low Operating Current (24 µA)
■ Low Quiescent Current (18 µA)
■ Low Ripple
■ Fast Transient Response
■ Linear Dropout Characteristics
■ Short Circuit Protection
■ Regulates Down to 1.8 V
■ Synchronous Rectification
■ Internal Battery Monitor

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