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LT1619ES8#PBF
LT1619 Low Voltage Current Mode PWM Controller U FEATURES s s s s s s s s s s s DESCRIPTIO 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. 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 Converter efficiency is improved at heavy loads with a 53mV current sense voltage and at light load with Burst Mode operation. The operating frequency is internally set at 300kHz. The oscillator can also be synchronized externally up to 500kHz. No load quiescent current is 140µA and shutdown current is 15µA. U APPLICATIO S s s s The LT1619 is available in 8-lead MSOP and SO packages. 3.3V to 5V DC/DC Converters Distributed Power Supplies Isolated Power Supplies , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. U TYPICAL APPLICATIO Efficiency VIN 3.3V 12.4k 2 3 75k 220pF 4 VIN S/S FB DRV LT1619 VC GATE GND 15nF SENSE 8 7 6 + 0.1µF C1 22µF 90 L1 5.6µH 5A VOUT 5V 2.2A 0.1µF M1 Si9804 5 D1 + RSENSE 0.01Ω C1: PANASONIC EEFCDOK220R COUT: KEMET T495X227K010AS (×2) D1: MBRD835L L1: COILCRAFT DO5022P-562 1619 F01 COUT 440µF EFFICIENCY (%) 1 37.4k 95 85 80 75 70 1 10 100 LOAD CURRENT (mA) 1000 1619 F01a Figure 1. High Efficiency 3.3V to 5V DC/DC Converter 1619fa 1
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