The MAX14984 is an integrated VGA port protector and dual USB power switches that detects the insertion and removal of a monitor and automatically connects the graphics controller when a monitor is detected. In addition to normal VGA signals, it also provides up to 55mA to the VGA port via a switched 5V output. The MAX14984 also features a single active-low enable input to control two 5V USB switches. Each switch supplies 500mA of current with less than 250mV drop from VCC, and is protected against short-circuit faults. Two active-low fault outputs indicate when a fault condition is detected on either output. High-bandwidth analog switches exceed VESA rise/fall time requirements for the RGB channels. The horizontal and vertical synchronization (H/V) buffers shift logic levels to support +2.5V to +5.0V CMOS or TTL-compatible graphics controllers while meeting the VESA drive capability requirement of Q8mA. An internal 2.5V regulator and pullup resistors on the monitor side translate the DDC voltage level to a level that is compatible with the logic level of the graphics controller.
The MAX14984 integrates VGA signal protection, monitor detection, and two USB power switches in a compact 24‑pin TQFN package. It supplies a switched 5 V output of up to 55 mA to the VGA port and provides up to 500 mA per USB switch with low voltage drop.
The device offers high‑ESD protection of +8 kV HBM on all VGA and USB outputs, operates from –40 °C to +85 °C, and includes fault‑output signals for over‑current conditions. Detailed electrical characteristics, pin descriptions, and typical operating curves are provided in the datasheet.
| Supply Voltage (Voc) | 4.75 V – 5.25 V |
|---|---|
| USB Switch Voltage Drop | 250 mV at 500 mA |
| USB Switch Continuous Load Current | 500 mA |
| USB Switch Current‑Limit Threshold | 0.5 A – 1.0 A |
| Switched 5 V Output (S5V) Current | 55 mA |
| ESD Protection (VGA & USB) | +8 kV HBM |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 24‑pin TQFN (4 mm × 4 mm) EP |
The device operates from –40 °C to +85 °C.
Each USB switch can supply up to 500 mA of continuous load current.
It provides high‑ESD protection of +8 kV Human Body Model on all VGA and USB outputs.
It is offered in a 24‑pin TQFN package measuring 4 mm × 4 mm with an exposed pad.