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SM8303 Datasheet(PDF) 1 Page - SamHop Microelectronics Corp. |
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SM8303 Datasheet(HTML) 1 Page - SamHop Microelectronics Corp. |
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1 / 11 page  SAMHOP Microelectronics Corp. SM8303 150KHz, 3A PWM Buck Switching Regulator 1 V1.0 May 17 ,2007 General Description The SM8303 is a monolithic integrated circuit that provide all the active functions for a step-down switching regulator, capable of driving a 3A load without additional transistor component. Requiring a minimum number of external component, the board space can be saved easily. The external shutdown function can be controlled by TTL logic level and then come into standby mode. The internal compensation makes feedback control have good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. The SM8303 operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The packages are available in a standard 5-lead TO-220(T) package and a 5-lead TO-263(S). Features - 3.3V, 5V, 12V and adjustable output versions - Adjustable version output voltage range, 1.23V to 28V +4% max over line and load condition - Available in TO220-5L and TO263-5L packages - Voltage mode non-synchronous PWM control - Thermal-shutdown and current-limit protection - ON/OFF shutdown control input - Input voltage range up to 32V - Output load current: 3A - 150KHz fixed frequency internal oscillator - Low power standby mode - Built-in switching transistor on chip Applications - Simple High-efficiency step-down(buck) regulator - Efficient preregulator for linear regulators - On-card switching regulators - Positive to negative converter - Battery Charger Pin Assignments TO220-5L ( Top View ) ( Top View ) TO263-5L 1 V IN 5 SD 4 FB 3 Gnd 2 Output Metal Tab GND 1 V IN 5 SD 4 FB 3 Gnd 2 Output Pin Descriptions Name Description VIN Operating voltage input Output Switching output Gnd Ground FB Output voltage feedback control SD ON/OFF Shutdown |
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