Diodes Incorporated
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AP3433 (Obsolete)

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The AP3433 is a current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 3A load with high efficiency, excellent line and load regulation. The device integrates two N-channel power MOSFETs with low on-resistance. Current mode control provides fast transient response and cycle-by-cycle current limit. The switching frequency of AP3433 can be programmable from 300kHz to 2MHz, 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. Under voltage lockout is internally set at 2.6V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage startup ramp is control°C by the soft-start pin. An open drain power good signal indicates the output is within 93% to 107% of its nominal voltage.


  • Low-voltage, High-density Power Systems
  • Point of Load Regulation for Consumer Applications such as Set Top Boxes, LCD Displays, CPE Equipment

Product Specifications

Product Parameters

Efficiency (%) 94
Frequency Typ (Hz) 300
HS RDS(ON) (mΩ) 45
LS RDS(ON) (mΩ) 42
MaximumInput Voltage (V) 5.5
MinimumInput Voltage (V) 2.95
Output Current (mA) 3
Output Voltage (V) 0.827 to 0.9xVIN
Quiescent Current Typ (mA) 0.36
Shutdown Current Typ (µA) 2
Type Buck

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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-2364 2018-10-04 2019-04-04 Device End of Life (EOL)