DESCRIPTION
●The LTC®1625 is a synchronous step-down switching regulator controller that drives external N-Channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. The frequency of a nominal 150kHz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range.
●FEATURES
●■ Highest Efficiency Current Mode Controller
●■ No Sense Resistor Required
●■ Stable High Current Operation
●■ Dual N-Channel MOSFET Synchronous Drive
●■ Wide VIN Range: 3.7V to 36V
●■ Wide VOUT Range: 1.19V to VIN
●■ ±1% 1.19V Reference
●■ Programmable Fixed Frequency with Injection Lock
●■ Very Low Drop Out Operation: 99% Duty Cycle
●■ Forced Continuous Mode Control Pin
●■ Optional Programmable Soft Start
●■ Pin Selectable Output Voltage
●■ Foldback Current Limit
●■ Output Overvoltage Protection
●■ Logic Controlled Micropower Shutdown: IQ < 30µA
●■ Available in 16-Lead Narrow SSOP and SO Packages
●APPLICATIONS
●■ Notebook and Palmtop Computers, PDAs
●■ Cellular Telephones and Wireless Modems
●■ Battery Chargers
●■ Distributed Power
