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LT1766EFE-5-TR Datasheet(PDF) 1 Page - Linear Technology |
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LT1766EFE-5-TR Datasheet(HTML) 1 Page - Linear Technology |
1 / 30 page LT1766/LT1766-5 1 1766fc TYPICAL APPLICATION DESCRIPTION 5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator 5V Buck Converter FEATURES APPLICATIONS n Wide Input Range: 5.5V to 60V n 1.5A Peak Switch Current n Constant 200kHz Switching Frequency n Saturating Switch Design: 0.2Ω n Peak Switch Current Rating Maintained Over Full Duty Cycle Range n Low Effective Supply Current: 2.5mA n Low Shutdown Current: 25μA n 1.2V Feedback Reference Voltage (LT1766) n 5V Fixed Output (LT1766-5) n Easily Synchronizable n Cycle-by-Cycle Current Limiting n Small 16-Pin SSOP and Thermally Enhanced TSSOP Packages The LT ®1766/LT1766-5are200kHzmonolithicbuckswitch- ing regulators that accept input voltages up to 60V. A high efficiency 1.5A, 0.2Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. 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 25μA 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. n High Voltage, Industrial and Automotive n Portable Computers n Battery-Powered Systems n Battery Chargers n Distributed Power Systems Efficiency vs Load Current BOOST VIN 6 2 10 12 10MQ060N 15.4k VOUT 5V 1A 4 15 14 11 220pF 0.022μF * † FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY TDK C4532X7R2A225K 1, 8, 9, 16 LT1766 SHDN SYNC SW BIAS FB VC GND 0.33μF 100μF 10V SOLID TANTALUM 47μH 1N4148W 4.99k 1766 TA01 2.2μF † 100V CERAMIC VIN* 5.5V TO 60V + 2.2k ON OFF 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 = 47μH L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6498466, 6531909. |
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