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IC manufacturers Diodes Incorporated

Diodes Incorporated AP1501



TopologyBuck Converter
Input voltage12 V
Switching frequency127-173 kHz
Output 15 V / 3 A
IC revision11


The AP1501 is a fully integrated step-down DC/DC converter, with the ability to drive 3A load without the need of additional driver components. The AP1501 operates at a switching frequency of 150KHZ enabling the use of small size filter components. As a result, board space is reduced and BOM costs are lowered.

The AP1501 has integrated the shutdown function that allows standby mode to be activated via an external logic signal input. The internal compensation facilitates feedback control for line and load regulation without the need of an external circuitry. The AP1501 has a built-in Thermal shutdown and Current Limit function to prevent damage from high operating temperature and high current operating to the output switch.

Additional features include a guaranteed +/- 4% tolerance on the output voltage under specified input and output load conditions, and +/- 15% on oscillator frequency. The AP1501 offers both fixed and a Adjustable output voltages. For fixed outputs the AP1501 supports 3.3V, 5.0V and 12V. The package options available are standard 5-lead TO263 and TO220(R) packages.


  • Output voltage: 3.3V, 5V, 12V and adjustable outputversion
  • Adjustable version output voltage range, 1.23V to37V+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 40V
  • Output load current: 3A
  • Low power standby mode
  • Built-in switching transistor on chip
  • Lead Free packages: TO263-5L and TO220-5L(R)
  • TO263-5L and TO220-5L(R): Available in “Green”Molding Compound (No Br, Sb)
  • Lead Free Finish/RoHS Compliant (Note 1)

Typical applications

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