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LT1376CS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1376CS8 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LT1375/LT1376 1.5A, 500kHz Step-Down Switching Regulators s Constant 500kHz Switching Frequency s Easily Synchronizable s Uses All Surface Mount Components s Inductor Size Reduced to 5 µH s Saturating Switch Design: 0.4 Ω s Effective Supply Current: 2.5mA s Shutdown Current: 20 µA s Cycle-by-Cycle Current Limiting s Portable Computers s Battery-Powered Systems s Battery Charger s Distributed Power The LT ®1375/LT1376 are 500kHz monolithic buck mode switching regulators. A 1.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available. A special high speed bipolar process and new design techniques achieve high efficiency at high switching fre- quency. Efficiency is maintained over a wide output cur- rent range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. A shutdown signal will reduce supply current to 20 µA on both parts. The LT1375 can be externally syn- chronized from 550kHz to 1MHz with logic level inputs. The LT1375/LT1376 fit into standard 8-pin PDIP and SO packages, as well as a fused lead 16-pin SO with much lower thermal resistance. Full cycle-by-cycle short-cir- cuit protection and thermal shutdown are provided. Standard surface mount external parts are used, includ- ing the inductor and capacitors. For low input voltage applications with 3.3V output, see LT1507. This is a functionally identical part that can operate with input voltages between 4.5V and 12V. , LTC and LT are registered trademarks of Linear Technology Corporation. 5V Buck Converter LOAD CURRENT (A) 0 100 90 80 70 60 50 1.00 1375/76 TA02 0.25 0.50 0.75 1.25 VOUT = 5V VIN = 10V L = 10 µH Efficiency vs Load Current BOOST LT1376-5 VIN OUTPUT** 5V, 1.25A * RIPPLE CURRENT ≥ IOUT/2 ** INCREASE L1 TO 10 µH FOR LOAD CURRENTS ABOVE 0.6A AND TO 20µH ABOVE 1A † FOR INPUT VOLTAGE BELOW 7.5V, SOME RESTRICTIONS MAY APPLY. SEE APPLICATIONS INFORMATION. INPUT 6V† TO 25V 1375/76 TA01 C2 0.1 µF CC 3.3nF D2 1N5818 C1 100 µF, 10V SOLID TANTALUM C3* 10 µF TO 50 µF D2 1N914 L1** 5 µH VSW FB BIAS GND VC DEFAULT = ON SHDN + + FEATURES APPLICATIO S DESCRIPTIO TYPICAL APPLICATIO |
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