JSMSEMI AP1509-SG-13-JSM

The AP1509 is a monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 3A 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 VFB is down below 0.5V, the switching frequency will be reduced. The AP1509 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 chips are available in a standard 8-lead SOP8 package.

• 3.3V, 5V, 12V and Adjustable Output Version
• Output Adjustable Voltage From 1.23V to 37V
• Fixed 150KHz Switching Frequency
• Voltage Mode Non-synchronous PWM Control
• ON/OFF Shutdown Control Input
• Wide 4.5V to 40V Input Voltage Range
• Output Load Current: 3A
• Low Power Standby Mode
• Built-in Switching Transistor on Chip

• Simple High-Efficiency Step-down Regulator
• On-card Switching Regulators
• Positive to Negative Converter