Overview
The TPS2021DRG4 is a high-side power switch from Texas Instruments, designed to provide reliable and efficient power management in various electronic systems. This device is part of the TPS202x family, which includes several models with different current ratings. The TPS2021DRG4 is specifically configured to handle up to 0.9 A of continuous output current, making it suitable for a range of applications requiring controlled power distribution.
The device features an N-channel MOSFET with a low on-state resistance, enabling minimal power loss during operation. It includes several protection mechanisms such as overcurrent protection, thermal sensing, and undervoltage lockout, ensuring the device and the system it powers remain safe under various operating conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VI(IN)) | 2.7 | 5.5 | V | |
| Continuous Output Current (IO) | 0 | 0.9 | A | |
| Operating Junction Temperature (TJ) | -40 | 125 | °C | |
| Static Drain-Source On-State Resistance (rDS(on)) at VI(IN) = 5 V, TJ = 25°C, IO = 0.18 A | 30 | 34 | 41 | mΩ |
| High-Level Input Voltage (VIH) | 2 | 4.5 | V | |
| Low-Level Input Voltage (VIL) | 0 | 0.5 | V | |
| Turn-On Time | 20 | ms | ||
| Turn-Off Time | 40 | ms | ||
| Short-Circuit Output Current (IOS) | 0.66 | 0.9 | 1.1 | A |
Key Features
- High-Side Power Switch: Configured as an N-channel MOSFET with low on-state resistance, minimizing power loss.
- Overcurrent Protection: The device switches into constant-current mode when an overcurrent condition is detected, protecting against excessive load.
- Thermal Protection: Prevents damage by shutting off the switch when the junction temperature exceeds safe limits, with hysteresis to prevent oscillation.
- Undervoltage Lockout: Ensures the power switch is off during power-up until the input voltage reaches a safe level.
- Enable Input: Logic-low input turns on the power switch, allowing for easy control from a microcontroller or other logic source.
- Open-Drain Overcurrent Output: Asserts low when an overcurrent or overtemperature condition is encountered, providing a signal for system monitoring.
Applications
- Power Distribution in Electronic Systems: Suitable for managing power in various electronic devices, including consumer electronics, industrial equipment, and automotive systems.
- Hot-Plugging and System Surge Control: Enables safe hot-plugging of devices and controls system surge currents, making it ideal for applications where devices are frequently connected and disconnected.
- Battery-Powered Devices: Useful in battery-powered devices where efficient power management is crucial for extending battery life.
- Automotive and Industrial Control Systems: Can be used in harsh environments due to its robust protection features and wide operating temperature range.
Q & A
- What is the maximum continuous output current of the TPS2021DRG4?
The maximum continuous output current of the TPS2021DRG4 is 0.9 A.
- What is the input voltage range for the TPS2021DRG4?
The input voltage range for the TPS2021DRG4 is from 2.7 V to 5.5 V.
- How does the overcurrent protection work in the TPS2021DRG4?
The device switches into constant-current mode when an overcurrent condition is detected, protecting against excessive load.
- What is the purpose of the undervoltage lockout feature?
The undervoltage lockout ensures the power switch is in the off state at power-up until the input voltage reaches a safe level.
- How does the thermal protection mechanism work?
The thermal protection mechanism shuts off the switch when the junction temperature exceeds safe limits, with hysteresis to prevent oscillation.
- What is the function of the enable input (EN) pin?
The enable input (EN) pin is a logic-low input that turns on the power switch.
- What is the significance of the open-drain overcurrent output (OC) pin?
The open-drain overcurrent output (OC) pin asserts low when an overcurrent or overtemperature condition is encountered, providing a signal for system monitoring.
- How can false overcurrent reporting be reduced in the TPS2021DRG4?
False overcurrent reporting can be reduced by using an RC filter on the OC pin and low-ESR electrolytic capacitors on the output.
- What are the typical applications of the TPS2021DRG4?
The TPS2021DRG4 is suitable for power distribution in electronic systems, hot-plugging, system surge control, battery-powered devices, and automotive and industrial control systems.
- What is the operating junction temperature range of the TPS2021DRG4?
The operating junction temperature range of the TPS2021DRG4 is from -40°C to 125°C.
