DESCRIPTION
The LT ®1619 is a fixed frequency PWM controller for implementing current mode DC/DC converters with minimum external parts. The LT1619 operates with input voltages ranging from 1.9V to 18V and is suitable for a variety of battery-powered and distributed DC/DC converters. The internal rail-to-rail N-channel MOSFET driver operates either from the input in the nonbootstrapped mode or from the output in bootstrapped operation. The driver is designed to drive a low side power transistor in boost, SEPIC, flyback and other topologies.

FEATURES
■ Wide VIN Range: 1.9V to 18V
■ 300kHz Fixed Frequency Current Mode Control
■ 1A Rail-to-Rail N-Channel MOSFET Driver
■ Low 53mV Current Limit Threshold Voltage
   Improves Efficiency
■ Implements Boost, SEPIC and Flyback Converters
   Requiring Low Side Power Transistors
■ Internal Current Sense Amplifier
   with Leading Edge Blanking
■ Up to 500kHz External Synchronization
■ Burst Mode® Operation for High Efficiency
   at Light Load
■ 140µA Quiescent Current
■ 15µA Shutdown Current
■ 8-Lead MSOP and SO Packages

APPLICATIONS
■ 3.3V to 5V DC/DC Converters
■ Distributed Power Supplies
■ Isolated Power Supplies