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LT1576CS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1576CS8 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LT1576/LT1576-5 1.5A, 200kHz Step-Down Switching Regulator BOOST LT1576 VIN SHDN OUTPUT** 5V, 1.25A * RIPPLE CURRENT RATING ≥ IOUT/2 ** INCREASE L1 TO 30 µH FOR LOAD CURRENTS ABOVE 0.6A AND TO 60 µH ABOVE 1A SEE APPLICATIONS INFORMATION INPUT 6V TO 25V 1576 TA01 C2 0.33 µF CC 100pF D1 1N5818 C1 100 µF, 10V SOLID TANTALUM C3* 10 µF TO 50 µF OPEN = ON D2 1N914 L1** 15 µH VSW FB BIAS GND VC + + R2 4.99k R1 15.8k 5V Buck Converter Efficiency vs Load Current s Constant 200kHz Switching Frequency s 1.21V Reference Voltage s Fixed 5V Output Option s Easily Synchronizable s Uses All Surface Mount Components s Inductor Size Reduced to 15 µH s Saturating Switch Design: 0.2 Ω s Effective Supply Current: 1.16mA s Shutdown Current: 20 µA s Cycle-by-Cycle Current Limiting s Fused Lead SO-8 Package The LT ®1576 is a 200kHz monolithic buck mode switching regulator. A 1.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. The topology is current mode for fast transient response and good loop stability. The LT1576 is a modified version of the industry standard LT1376 optimized for noise sensitive applications. In addition, the reference voltage has been lowered to allow the device to produce output voltages down to 1.2V. Quiescent current has been reduced by a factor of two. Switch on resistance has been reduced by 30%. Switch tran- sition times have been slowed to reduce EMI generation. The oscillator frequency has been reduced to 200kHz to maintain high efficiency over a wide output current range. The pinout has been changed to improve PC layout by allowing the high current high frequency switching cir- cuitry to be easily isolated from low current noise sensitive control circuitry. The new SO-8 package includes a fused ground lead which significantly reduces the thermal resis- tance of the device to extend the ambient operating tem- perature range. There is an optional function of shutdown or synchronization. Standard surface mount external parts can be used including the inductor and capacitors. s Portable Computers s Battery-Powered Systems s Battery Charger s Distributed Power , LTC and LT are registered trademarks of Linear Technology Corporation. LOAD CURRENT (A) 0 100 95 90 85 80 75 70 0.25 0.50 0.75 1.00 1576 TA02 1.25 1.50 VOUT = 5V VIN = 10V L = 33 µH FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATION |
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