The **ADP198ACBZ-R7** is a high-side load switch designed by Analog Devices. It is primarily used to control the power rails in battery-powered devices, allowing the system to turn specific components on or off to save energy. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 1.65 V to 6.5 V | | **Continuous Current** | Up to 1.1 A | | **On-Resistance ($R_{DS(ON)}$)** | ~50 mΩ at 3.3 V | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | | **Quiescent Current** | Low (approx. 2 µA when enabled) | | **Control Logic** | Logic-high enable (EN pin) | --- ### 2. Core Functional Components The device consists of three main internal stages: 1. **P-Channel MOSFET:** The heart of the switch. It has low resistance to minimize voltage drops and heat dissipation. 2. **Charge Pump / Level Shifter:** Ensures the internal gate drive is sufficient to fully turn the MOSFET on or off, even at low input voltages. 3. **Discharge Switch:** When the device is disabled, an internal resistor (approx. 80 Ω) pulls the output to ground to ensure the load is fully discharged quickly. --- ### 3. Application Use Cases * **Mobile Devices:** Turning off GPS or Camera modules when not in use. * **Power Sequencing:** Ensuring one voltage rail turns on before another in complex processors. * **Industrial Handhelds:** Managing battery life by cutting power to peripheral sensors. --- ### 4. Schematic Implementation Example In a typical circuit, the pinout is utilized as follows: ```text [ VIN ] ----( Ball A1 ) ( Ball A2 )---- [ VOUT ] | | [ EN ] ----( Ball B1 ) ( Ball B2 )---- [ GND ] ``` * **VIN:** Connected to the power source (e.g., Li-Ion Battery). * **VOUT:** Connected to the load (e.g., a Bluetooth module). * **EN:** Driven by a Microcontroller (GPIO) to toggle power. * **GND:** System ground.