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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.
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 (A) |
3 |
Output Voltage (V) |
0.827 to 0.9xVIN |
Quiescent Current Typ (μA) |
0.36 |
Shutdown Current Typ (µA) |
2 |
Type |
Buck |
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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-2770 | 2025-10-30 | 2025-10-30 | Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products |
