LT1619 Datasheet | Linear Technology

LT1619 Low Voltage Current Mode PWM Controller Features s s s s DESCRIPTIO s s s s s s s Wide VIN Range: 1.9V to 18V 300k Hz Fixed Frequency Current Mode Control 1A Rail-to-Rail N-Channel MOSFET Driver Low 53m V 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 500k Hz External Synchronization Burst Mode® Operation for High Efficiency at Light Load 140µA Quiescent Current 15µA Shutdown Current 8-Lead MSOP and SO Packages 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. Converter efficiency is improved at heavy loads with a 53m V current sense voltage and at light load with Burst Mode operation. The operating frequency is internally set at 300k Hz. The oscillator can also be synchronized externally up to 500k Hz. No load quiescent current is 140µA and shutdown current is 15µA. The LT1619 is available in 8-lead MSOP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. U APPLICATIO S s s s 3.3V to 5V DC/DC Converters Distributed Power Supplies Isolated Power Supplies TYPICAL APPLICATIO VIN 3.3V 37.4k 12.4k 1 2 3 S/S FB VC GND VIN DRV LT1619 GATE SENSE 8 7 6 5 0.1µF + EFFICIENCY (%) C1 22µF 0.1µF L1 5.6µH 5A VOUT 5V 2.2A M1 Si9804 D1 75k 220p F 15n F + COUT 440µF RSENSE 0.01Ω 1619 F01 C1: PANASONIC EEFCDOK220R...