Diodes Incorporated
U DFN3030 10

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AP3409 (Obsolete)


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The AP3409/A is a current mode, PWM synchronous buck DC/DC converter, capable of driving a 3A load with high efficiency, excellent line and load regulation. It operates in continuous PWM mode. The AP3409/A integrates synchronous P-channel and N-channel power MOSFET switches with low on-resistance. It is ideal for portable applications powered from a single Li-ion battery. 100% duty cycle and low on-resistance P-channel internal power MOSFET can maximize the battery life. The switching frequency of AP3409/A can be programmable from 300kHz to 4MHz, which allows small-sized components, such as capacitors and inductors. A standard series of inductors from several different manufacturers are available. This feature greatly simplifies the design of switch-mode power supplies.


  • Portable Media Player
  • Digital Still and Video Cameras
  • Notebook

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Efficiency (%) 95
Frequency Typ (Hz) 300
Frequency Typ (kHz) 300
HS RDS(ON) (mΩ) 110
HS RDS(ON) (mΩ) 110
LS RDS(ON) (mΩ) 110
LS RDS(ON) (mΩ) 110
MaximumInput Voltage (V) 5.5
Maximum Input Voltage (V) 5.5
Maximum Output Voltage (V) ADJ
MinimumInput Voltage (V) 2.6
Minimum Input Voltage (V) 2.6
Output Current (mA) 3
Output Current (A) 3
Output Voltage (V) ADJ
Quiescent Current Typ (mA) 0.46
Quiescent Current Typ (µA) 460
Shutdown Current Typ (µA) 1
Shutdown Current Typ (µA) 1
Type Buck

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