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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 (mA) | 3 |
| Output Voltage (V) | 0.827 to 0.9xVIN |
| Quiescent Current Typ (mA) | 0.36 |
| Shutdown Current Typ (µA) | 2 |
| Type | Buck |
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) |
