Description
The AP1509 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 VFB is down below 0.5V, the switching frequency
will be reduced. The AP1509 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 8-lead SOP-8 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
• SOP-8L Packages
• Low Power Standby Mode
• Built-in Switching Transistor On Chip
• SOP-8L: Available in “Green” Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Applications
• Simple High-Efficiency Step-Down Regulator
• On-Card Switching Regulators
• Positive to Negative Converter
