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LT1616 Datasheet(PDF) 1 Page - Linear Technology |
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LT1616 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LT1766/LT1766-5 1766fa BOOST VIN 6 2 10 12 10MQ060N 15.4k VOUT 5V 1A 4 15 14 11 220pF 0.022 µF * † FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY TDK C4532X7R2A225K 1, 8, 9, 16 LT1766 SHDN SYNC SW BIAS FB VC GND 0.33 µF 100 µF 10V SOLID TANTALUM 47 µH 1N4148W 4.99k 1766 TA01 2.2 µF† 100V CERAMIC VIN 5.5V* TO 60V + 2.2k ON OFF 5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator s Wide Input Range: 5.5V to 60V s 1.5A Peak Switch Current s Constant 200kHz Switching Frequency s Saturating Switch Design: 0.2 Ω s Peak Switch Current Rating Maintained Over Full Duty Cycle Range s Low Effective Supply Current: 2.5mA s Low Shutdown Current: 25 µA s 1.2V Feedback Reference Voltage (LT1766) s 5V Fixed Output (LT1766-5) s Easily Synchronizable s Cycle-by-Cycle Current Limiting s Small 16-Pin SSOP and Thermally Enhanced TSSOP Packages The LT ®1766/LT1766-5 are 200kHz monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 1.5A, 0.2 Ω switch is included on the die along with all the necessary oscillator, control and logic cir- cuitry. A current mode control architecture delivers 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 25 µA and the device can be externally synchronized from 228kHz to 700kHz with logic level inputs. The LT1766/LT1766-5 are available in a 16-pin fused-lead SSOP package or a TSSOP package with exposed backside for improved thermal performance. s High Voltage, Industrial and Automotive s Portable Computers s Battery-Powered Systems s Battery Chargers s Distributed Power Systems , LTC and LT are registered trademarks of Linear Technology Corporation. 5V Buck Converter Efficiency vs Load Current LOAD CURRENT (A) 0 80 90 100 1.00 1766 TA02 70 60 50 0.25 0.50 0.75 1.25 VIN = 12V VIN = 42V VOUT = 5V L = 47 µH FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO *Patent # 6, 498, 466 |
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