Description
The RS1509 is Monolithic IC that design for a step-down DC/DC Converter, and own the ability of driving a 2A load without additional transistor component. The output version included 3.3V, 5V, 12V and an adjustable type. It 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. 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.

FEATUREs
• 3.3V, 5V, 12V and adjustable
• Adjustable version output voltage range: 1.4-37V
• ±4% max over line and load conditions
• 150KHz ±15% fixed switching frequency
• TTL shutdown capability
• Operating voltage can be up to 40V
• Output load current: 2A
• SOP-8 and DIP-8 packages
• Low power standby mode
• Thermal-shuntdown and current-limit protection
• High efficiency
• Built-in switching a transistor on chip, requires only 4 external components

APPLICATIONs
• Simple High-efficiency step-down regulator
• Positive to negative converter
• On-card switching regulators