1. Overview and Function

️· What it is: The G526 is a dual high-side switch designed for USB power applications. It's essentially two independent switches in one package.
️· Active-High/Active-Low: Available in two versions, G526-1 (active-high enable) and G526-2 (active-low enable).
️· Purpose: Used to control power to USB hubs, devices, and other loads, offering protection and meeting USB power requirements.

2. Key Features & Protection

️· Soft Start: Reduces inrush current during startup, preventing voltage drops and meeting USB specifications.
️· Undervoltage Lockout (UVLO): Prevents operation if the input voltage (IN) is too low (below 2.5V typical).
️· Current Limiting: Limits output current to prevent damage to the switch and load (typically 0.5A).
️· Thermal Shutdown: Shuts off both switches if the die temperature exceeds 135°C, with hysteresis to prevent oscillation (shuts off at 135°C, turns back on at 125°C).
️· Fault Flag (FLG): An open-drain output that signals fault conditions (UVLO, current limit, or thermal shutdown). Requires an external pull-up resistor.

3. Applications & Design Considerations

️· Supply Filtering: A bypass capacitor (0.1 µF to 1 µF) from IN to GND is *essential* to handle transient voltage spikes.
️· Transient Overcurrent Filter: A simple RC filter (1ms) may be needed in series with the fault flag output to prevent spurious overcurrent flags during heavy load startup.
️· Enable Input: The enable input (EN) must be actively driven high or low; floating the input is not allowed.
️· Soft Start Importance: Critical for meeting USB voltage drop requirements, especially with larger capacitive loads.

4. Specifications & Package

️· Input Voltage: 4.0V to 5.5V
️· Package: 8-lead SOIC (Small Outline Integrated Circuit) - Dimensions and tolerances are specified.
️· Package Body Sizes: Exclude mold flash and gate burrs.

5. Functional Description

️· Input (IN): Power supply connection for both the logic circuitry and the MOSFET source.
️· Output (OUTx): Drain of the MOSFETs.
️· Reverse Voltage Capability: The device can handle a higher voltage at the output (VOUT) compared to the input (VIN) when the switch is off, preventing drain-to-body diode current flow.
️· Current Sensing: Allows for constant-current mode during overcurrent conditions.
️· Reaction to Overcurrent: A switch being turned on under heavy load, or having a heavy load applied, will result in an output voltage that will fold back into a constant-current mode while a fault flag may be pulled down.



In essence, the G526 is a robust and protected dual switch designed for USB power management, offering features to meet USB specifications and prevent damage to connected devices.