AP4435B SOP-8L 30V 9.3A P-channel FET APM
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The AP4435B is a P-channel MOSFET designed for power management applications. It is commonly used in DC-DC converters, battery management systems, and general-purpose switching circuits. The device is housed in an SOP-8L package, making it suitable for compact designs.
Key Specifications
| Parameter | Value |
|---|---|
| Maximum Drain-Source Voltage (V<sub>DS</sub>) | -30V |
| Maximum Drain Current (I<sub>D</sub>) | -9.3A (at 25°C) |
| Gate Threshold Voltage (V<sub>GS(th)</sub>) | -1V to -3V |
| On-State Resistance (R<sub>DS(on)</sub>) | 20mΩ (at V<sub>GS</sub> = -10V) |
| Maximum Power Dissipation (P<sub>D</sub>) | 2.5W |
| Operating Temperature | -55°C to +150°C |
| Package | SOP-8L |
Features
- Low On-Resistance: Ensures low conduction losses for improved efficiency.
- High Current Handling: Capable of handling up to 9.3A.
- Logic-Level Gate Drive: Can be driven directly by logic-level signals (e.g., 3.3V or 5V).
- Thermal Stability: Suitable for high-temperature environments.
- Compact Package: SOP-8L for space-saving designs.
Applications
- DC-DC Converters: Used as a switching element.
- Battery Management: Ideal for battery charging and discharging control.
- Load Switching: Controls high-current loads with low gate drive voltage.
- Reverse Polarity Protection: Protects circuits from incorrect power connections.
- Motor Control: Drives small motors or actuators in low-voltage applications.
Pin Configuration (SOP-8L)
| Pin | Function |
|---|---|
| 1-3 | Source (S) |
| 4 | Gate (G) |
| 5-8 | Drain (D) |
Typical Usage
The AP4435B is commonly used in low-side switching configurations in power circuits. Being a P-channel MOSFET, it is ideal for high-side switching when the source is connected to a positive voltage.
Example Circuit
High-Side Switch with AP4435B and Microcontroller:
- Connect the source to the positive supply voltage (+V).
- Connect the drain to the load.
- Connect the gate to a GPIO pin of the microcontroller through a resistor (e.g., 10kΩ).
- Use a pull-up resistor (e.g., 100kΩ) to keep the MOSFET off by default.
When the GPIO pin drives the gate low, the MOSFET turns on, supplying power to the load.
Design Considerations
- Gate Drive Voltage:
- Ensure the gate voltage is sufficiently negative relative to the source for full enhancement.
- For logic-level operation, confirm compatibility with the microcontroller's output voltage.
- Thermal Management:
- Add appropriate heat sinking or thermal vias to the PCB to dissipate heat during high-current operation.
- Voltage Ratings:
- Do not exceed the -30V V<sub>DS</sub> rating to avoid damage.
- Current Ratings:
- Limit the current to below -9.3A to ensure safe operation.
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