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The AP3445 is a 2A step-down DC-DC converter. At heavy load, the constant-frequency PWM control performs excellent stability and transient response. No external compensation components are required.

The AP3445 supports a range of input voltages from 2.7V to 5.5V allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, and other standard power sources. The output voltage is adjustable from 0.6V to the input voltage. The AP3445 employs internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 1μA. Other key features include over-temperature and short circuit protection, and under-voltage lockout to prevent deep battery discharge.

The AP3445 delivers 2A maximum output current while consuming only 55μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3445 an ideal choice for high output voltage, high current applications which require a low dropout threshold. Pulse skip mode to maintain high efficiency at light-load conditions.

The AP3445 is available in SOT26 (SC74R) package.


  • Post DC-DC Voltage Regulation
  • Set Top Boxes
  • Notebook Computer
  • PAD


  • Input Voltage: 2.7V to 5.5V
  • Output Voltage: 0.6V to VIN
  • 0.6V Reference Voltage with ±1.5% Precision
  • 55µA (Typ) No Load Quiescent Current
  • Shutdown Current: <1µA
  • 100% Duty Cycle Operation
  • 1MHz Switching Frequency
  • No External Compensation Required
  • Short Circuit Protection

AP3445L: Latch Off Protection

AP3445: Hiccup Mode Protection

  • Over Voltage Protection

AP3445L: Latch Off Protection

AP3445: Non Latch Off Protection

  • Thermal Shutdown

Product Specifications

Product Parameters

Type Buck
Efficiency 95 %
Frequency Typ 1000 kHz
Minimum Input Voltage 2.5 V
Maximum Input Voltage 5.5 V
Output Current 2 A
Output Voltage 0.6 to Vin V
Quiescent Current Typ 55 mA
Shutdown Current Typ N/A µA

Related Content

SOT26 (SC74R)


Technical Documents

Recommended Soldering Techniques



Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP3445LW6-7 Digi-Key Electronics 4164 4/3/2020 Buy Now United States
AP3445LW6-7 Mouser Electronics Inc. 2605 4/3/2020 Buy Now United States


Product Change Notices

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


Related Application FAQs