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AP1506 (Not Recommended for new design)

NRND = Not Recommended for New Design

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The AP1506 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 3A load without external transistor. Due to reducing the number of external components, the board space can be saved easily. The external shutdown function can be control°C by logic level and then come into standby mode. The internal compensation makes feedback control have 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 to prevent over current operating of the output switch. If current limit function occurred and VFB is down to 0.5V below, the switching frequency will be reduced. The AP1506 series operate 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. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The packages are available in a standard 5-lead TO-263 and TO-220.


  • Simple High-Efficiency Step-Down Regulator
  • On-Card Switching Regulators
  • Positive to Negative Converter

Product Specifications

Product Parameters

Efficiency (%) 89
Frequency Typ (Hz) 150
MaximumInput Voltage (V) 22
MinimumInput Voltage (V) 4.5
Output Current (A) 3
Output Voltage (V) 12, 5, 3.3, ADJ 1.23 to 18
Quiescent Current Typ (mA) 5
Shutdown Current Typ (µA) 70
Type Buck

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Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2427 2019-10-15 2020-04-15 Device End of Life (EOL)