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LT3430 Datasheet(PDF) 1 Page - Linear Technology |
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LT3430 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LT3430/LT3430-1 1 34301fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Voltage, 3A, 200kHz/100kHz Step-Down Switching Regulators The LT®3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high ef- ficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and excellent loop stability. Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry* maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and a SYNC pin can be externally synchronized with a logic level input from 228kHz to 700kHz for the LT3430 or from 125kHz to 250kHz for the LT3430-1. The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP package. 5V, 2A Buck Converter ■ Wide Input Range: 5.5V to 60V ■ 3A Peak Switch Current over All Duty Cycles ■ Constant Switching Frequency: 200kHz (LT3430) 100kHz (LT3430-1) ■ 0.1Ω Switch Resistance ■ Current Mode ■ Effective Supply Current: 2.5mA ■ Shutdown Current: 30µA ■ 1.2V Feedback Reference Voltage ■ Easily Synchronizable ■ Cycle-by-Cycle Current Limiting ■ Small, 16-Pin Thermally Enhanced TSSOP Package ■ Industrial and Automotive Power Supplies ■ Portable Computers ■ Battery Chargers ■ Distributed Power Systems , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. *US Patent # 6498466 Efficiency vs Load Current BOOST VIN 30BQ060 15.4k VOUT 5V 2A 220pF 0.022 µF *FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY ** SEE LT3430-1 CIRCUIT IN APPLICATIONS INFORMATION SECTION LT3430** SHDN SYNC SW BIAS FB VC GND 0.68 µF 100 µF 10V SOLID TANTALUM 22 µH MMSD914TI 4.99k 3430 TA01 4.7 µF 100V ON OFF VIN 5.5V* TO 60V + 3.3k LOAD CURRENT (A) 0 80 90 100 2.0 3430 TA02 70 60 50 0.5 1.0 1.5 2.5 VIN = 12V VIN = 42V VOUT = 5V LT3430-1 L = 68 µH LT3430 L =27 µH |
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Similar Description - LT3430 |
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