Diodes Incorporated
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AP3405 (Obsolete)

600mA Step-down DC/DC Converter with Synchronous Rectifier

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The AP3405 is a 2.0MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 600mA load with high efficiency, excellent line and load regulation. The high efficiency is easily configured by using an inductor, resistors and capacitors as the external components. Current mode control provides fast transient response and cycle-by-cycle current limit.

The AP3405 employs complete protection to ensure system security, including input Undervoltage Lockout, Overtemperature Protection and hiccup mode Short Circuit Protection.

This IC is available in U-DFN2020-8 package.


  • Post DC-DC Voltage Regulation
  • PDA and Notebook Computer

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Efficiency (%) 95
Frequency Typ (Hz) 2000
Frequency Typ (kHz) 2000
HS RDS(ON) (mΩ) 380
HS RDS(ON) (mΩ) 380
LS RDS(ON) (mΩ) 300
LS RDS(ON) (mΩ) 300
MaximumInput Voltage (V) 5.5
Maximum Input Voltage (V) 5.5
Maximum Output Voltage (V) ADJ
MinimumInput Voltage (V) 2.3
Minimum Input Voltage (V) 2.3
Output Current (mA) 0.6
Output Current (A) 0.6
Output Voltage (V) ADJ
Quiescent Current Typ (mA) 0.035
Quiescent Current Typ (µA) 35
Shutdown Current Typ (µA) 5
Shutdown Current Typ (µA) 5
Type Buck

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Technical Documents

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-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site