Diodes Incorporated

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AP3418 (Not Recommended for new design)

NRND = Not Recommended for New Design


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The AP3418 is a 1.4MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 1.5A load with high efficiency, excellent line and load regulation. The device integrates synchronous P-channel and N-channel power MOSFET switches with low on-resistance. It is ideal for powering portable equipment that runs from a single Li-ion battery. A standard series of inductors are available from several different manufacturers optimized for use with the AP3418. This feature greatly simplifies the design of switch-mode power supplies.


  • LCD TV
  • Set-top Box
  • Datacom
  • Portable Device
  • Smart Phone

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Efficiency (%) 91
Frequency Typ (Hz) 1400
Frequency Typ (kHz) 1400
HS RDS(ON) (mΩ) 200
HS RDS(ON) (mΩ) 200
LS RDS(ON) (mΩ) 150
LS RDS(ON) (mΩ) 150
MaximumInput Voltage (V) 5.5
Maximum Input Voltage (V) 5.5
Maximum Output Voltage (V) VIN
MinimumInput Voltage (V) 2.5
Minimum Input Voltage (V) 2.5
Minimum Output Voltage (V) 0.6
Output Current (mA) 1.5
Output Current (A) 1.5
Output Voltage (V) 0.6 to VIN
Quiescent Current Typ (mA) 0.062
Quiescent Current Typ (µA) 62
Shutdown Current Typ (µA) 1
Shutdown Current Typ (µA) 1
Type Buck

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Technical Documents

Evaluation Board User Guides

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-2602 2023-01-31 2023-07-31 Device End of Life (EOL)