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LT1676CS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1676CS8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1676 Wide Input Range, High Efficiency, Step-Down Switching Regulator s Wide Input Range: 7.4V to 60V s 700mA Peak Switch Current Rating s Adaptive Switch Drive Maintains Efficiency at High Load Without Pulse Skipping at Light Load s True Current Mode Control s 100kHz Fixed Operating Frequency s Synchronizable to 250kHz s Low Supply Current in Shutdown: 30 µA s Available in 8-Pin SO and PDIP Packages s Automotive DC/DC Converters s Telecom 48V Step-Down Converters s Cellular Phone Battery Charger Accessories s IEEE 1394 Step-Down Converters The LT ®1676 is a wide input range, high efficiency Buck (step-down) switching regulator. The monolithic die in- cludes all oscillator, control and protection circuitry. The part can accept input voltages as high as 60V and contains an output switch rated at 700mA peak current. Current mode control offers excellent dynamic input supply rejec- tion and short-circuit protection. The LT1676 contains several features to enhance effi- ciency. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly from the VIN supply (see Applications Information). The action of the LT1676 switch circuitry is also load depen- dent. At medium to high loads, the output switch circuitry maintains high rise time for good efficiency. At light loads, rise time is deliberately reduced to avoid pulse skipping behavior. The available SO-8 package and 100kHz switching fre- quency allow for minimal PC board area requirements. Figure 1 , LTC and LT are registered trademarks of Linear Technology Corporation. 39 µF 63V 1676 F01 VIN VCC VSW LT1676 FB VC SHDN SYNC 2 5 4 3 7 8 1 6 GND + 100 µF 10V + MBR160 36.5k 1% 5V 400mA 12.1k 1% 22k 220 µH* 2200pF VIN 8V TO 50V 100pF *65T #30 ON MAGNETICS MPP #55030 ILOAD (mA) 1 60 70 80 90 10 100 1000 1676 TA01 50 40 30 20 VIN = 12V VIN = 24V VIN = 36V VIN = 48V Efficiency vs VIN and ILOAD FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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