Overview
The LM3525MX-H/NOPB, produced by Texas Instruments, is a single port USB power switch and over-current protection device. It is designed to meet the Universal Serial Bus (USB) standards for power switching and protection in various host port applications. This device is particularly suitable for Notebook PC, Handheld PC, and other self-powered USB hub devices that require inrush current limiting and high side switching.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage Range | 2.7 | 5.5 | V | |
| Operating Ambient Range | -40 | 85 | °C | |
| Operating Junction Temperature Range | -40 | 125 | °C | |
| Storage Temperature Range | -65 | 150 | °C | |
| Switch Resistance (RON) | 120 | mΩ (at VIN = 5V) | ||
| Minimum Continuous Load Current | 500 | mA | ||
| Over-current Threshold | 2.25 | 3.2 | A | |
| Standby Current | 1 | µA | ||
| Operating Current | 65 | 100 | µA | |
| Thermal Shutdown Threshold | 135 | °C (increasing) | ||
| Thermal Shutdown Hysteresis | 125 | °C (decreasing) |
Key Features
- Compatible with USB 1.1 and USB 2.0 standards.
- 1 ms fault flag delay during hot-plug events to prevent erroneous overcurrent reporting.
- Smooth turn-on eliminates inrush-induced voltage drop.
- UL recognized component.
- Thermal shutdown protection to prevent device damage in direct short conditions.
- Undervoltage lockout (UVLO) to prevent the MOSFET switch from turning on until the input voltage exceeds 1.9V.
- Current limit circuit to protect the system supply, MOSFET switches, and the load from excessive currents.
- Small SOIC-8 package to minimize board space.
- Low RON and active-high or active-low enable inputs depending on the variant (LM3525-H or LM3525-L).
Applications
- Universal Serial Bus (USB) root hubs, including desktop and notebook PCs.
- USB monitor hubs.
- Other self-powered USB hub devices.
- High power USB devices requiring inrush limiting.
- General purpose high side switch applications.
Q & A
- What is the supply voltage range of the LM3525MX-H/NOPB?
The supply voltage range is from 2.7V to 5.5V. - What is the operating ambient temperature range for this device?
The operating ambient temperature range is from -40°C to +85°C. - What is the purpose of the 1 ms fault flag delay?
The 1 ms fault flag delay prevents erroneous overcurrent reporting caused by inrush currents during hot-plug events. - What is the minimum continuous load current for the LM3525MX-H/NOPB?
The minimum continuous load current is 500 mA. - Does the LM3525MX-H/NOPB have thermal shutdown protection?
Yes, it has thermal shutdown protection to prevent device damage in direct short conditions. - What is the over-current threshold for this device?
The over-current threshold is between 2.25 A and 3.2 A. - What package type is the LM3525MX-H/NOPB available in?
The device is available in an SOIC-8 package. - Is the LM3525MX-H/NOPB UL recognized?
Yes, it is UL recognized. - What is the purpose of the undervoltage lockout (UVLO) feature?
The UVLO feature prevents the MOSFET switch from turning on until the input voltage exceeds 1.9V and shuts off the MOSFET switch if the input voltage drops below 1.8V. - What are some common applications for the LM3525MX-H/NOPB?
Common applications include USB root hubs, USB monitor hubs, self-powered USB hub devices, and high power USB devices requiring inrush limiting.
