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LT1619 Arkusz danych(PDF) 1 Page - Linear Technology |
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LT1619 Arkusz danych(HTML) 1 Page - Linear Technology |
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1 / 20 page  1 LT1619 1619fa Low Voltage Current Mode PWM Controller , LTC and LT are registered trademarks of Linear Technology Corporation. The LT ®1619 is a fixed frequency PWM controller for implementing current mode DC/DC converters with mini- mum 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 con- verters. 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 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 exter- nally up to 500kHz. No load quiescent current is 140 µAand shutdown current is 15 µA. The LT1619 is available in 8-lead MSOP and SO packages. s Wide VIN Range: 1.9V to 18V s 300kHz Fixed Frequency Current Mode Control s 1A Rail-to-Rail N-Channel MOSFET Driver s Low 53mV Current Limit Threshold Voltage Improves Efficiency s Implements Boost, SEPIC and Flyback Converters Requiring Low Side Power Transistors s Internal Current Sense Amplifier with Leading Edge Blanking s Up to 500kHz External Synchronization s Burst Mode ® Operation for High Efficiency at Light Load s 140 µA Quiescent Current s 15 µA Shutdown Current s 8-Lead MSOP and SO Packages s 3.3V to 5V DC/DC Converters s Distributed Power Supplies s Isolated Power Supplies Figure 1. High Efficiency 3.3V to 5V DC/DC Converter Burst Mode is a registered trademark of Linear Technology Corporation. LOAD CURRENT (mA) 75 80 85 90 95 1 100 1000 1619 F01a 70 10 Efficiency FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO + 0.1 µF 0.1 µF 15nF 220pF VIN 3.3V L1 5.6 µH 5A D1 M1 Si9804 VOUT 5V 2.2A RSENSE 0.01 Ω 1619 F01 75k 37.4k 12.4k C1 22 µF C1: PANASONIC EEFCDOK220R COUT: KEMET T495X227K010AS (×2) D1: MBRD835L L1: COILCRAFT DO5022P-562 + COUT 440 µF S/S FB VC GND 8 7 6 5 1 2 3 4 VIN DRV GATE SENSE LT1619 |
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