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The AP3402 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 AP3402 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 AP3402 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 AP3402 delivers 2A maximum output current while consuming only 90μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3402 an ideal choice for high output voltage, high current applications which require a low dropout threshold.

The AP3402 is available in TSOT26 package.


  • Notebook PCs
  • TVs
  • Set-top-boxes
  • Networking Equipment
  • STB
  • LCD-TV
  • Coffee Machines
  • Power Supplies
  • Monitors


  • Output Current: Up to 2A
  • Output Voltage: 0.6V to VIN
  • Input Voltage: 2.7V to 5.5V
  • Peak Efficiency Up to 95%
  • 90μA (Typ) No Load Quiescent Current
  • Shutdown Current: <1μA
  • 100% Duty Cycle Operation
  • 1MHz Switching Frequency
  • Power Good Indicator Function
  • Internal Soft Start
  • No External Compensation Required
  • Current Limit Protection
  • Thermal Shutdown
  • TSOT26 Package

Product Specifications

Product Parameters

Type Buck
Efficiency 95 %
HS RDS(ON) 110 mΩ
LS RDS(ON) 80 mΩ
Frequency Typ 1000 kHz
Minimum Input Voltage 2.7 V
Maximum Input Voltage 5.5 V
Output Current 2 A
Output Voltage .6 to VIN V
Quiescent Current Typ 0.09 mA
Shutdown Current Typ 1 µA

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP3402KTTR-G1 Avnet EU 3000 7/22/2019 Buy Now Europe, Middle East, Africa
AP3402KTTR-G1 Arrow Electronics 82 7/22/2019 Buy Now Americas
AP3402KTTR-G1 Digi-Key Electronics 11258 7/22/2019 Buy Now Americas
AP3402KTTR-G1 Mouser Electronics Inc. 3662 7/22/2019 Buy Now Americas


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