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FSP3125SE Datasheet(PDF) 1 Page - FOSLINK SEMICONDUCTOR CO.,LTD |
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FSP3125SE Datasheet(HTML) 1 Page - FOSLINK SEMICONDUCTOR CO.,LTD |
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1 / 9 page  150KHZ，2A PWM BUCK DC/DC CONVERTER 2007-3-27 1/9 FSP3125 PIN ASSIGNMENT (Top View) PIN DESCRIPTION Name No. Description VIN 1 Operating Voltage Input OUTPUT 2 Switching Output FB 3 Output Voltage Feedback Control SD 4 On/Off Shutdown GND 5 Ground GND 6 Ground GND 7 Ground GND 8 Ground Typical Application Simple High-efficiency step-down regulator On-card switching regulators Positive to negative converter VIN OUTPUT FB SD GND GND GND GND FSP3125 8 7 6 5 1 2 3 4 GENERAL DESCRIPTION T he FSP3125 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 2A load without additional transistor. It saves board space. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having 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. If current limit function occurs and FB is down below 0.5V, the switching frequency will be reduced. The FSP3125 series operates at a switching frequency of 150KHz thus allow 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 chips are available in a standard SOP8L package. FEATURES Output voltage: 3.3V, 5V, 12V and adjustable output version Adjustable version output voltage range, 1.23V to 18V ± 4% 150KHz ±15% fixed switching frequency Voltage mode non-synchronous PWM control Thermal-shutdown and current-limit protection ON/OFF shutdown control input Operating voltage can be up to 22V Output load current: 2A SOP8L packages Low power standby mode Built-in switching transistor on chip |
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