特点
Wide V
IN
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
典型应用
典型应用
描述
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 inboost, SEPIC, flyback and other topologies.
Converter efficiency is improved at heavy loads with a53mV current sense voltage and at light load with Burst Mode operation. The operating frequency is internally setat 300kHz. The oscillator can also be synchronized externally up to 500kHz. No load quiescent current is 140μA and shutdown current is 15μA.
The LT1619 is available in 8-lead MSOP and SO packages.