Overview
The TPS22918DBVR from Texas Instruments is a 5.5-V, 2-A single-channel load switch designed to manage power distribution in various electronic systems. This device features an N-channel MOSFET with a low on-resistance of 52 mΩ (typical at VIN = 5 V) and 53 mΩ (typical at VIN = 3.3 V), ensuring minimal voltage drop and efficient power delivery. The load switch operates over an input voltage range of 1 V to 5.5 V and supports a maximum continuous current of 2 A. It is controlled by an active high ON pin, which is compatible with low-voltage control signals, making it suitable for use with microcontrollers having GPIO voltages of 1 V or higher.
The TPS22918DBVR is packaged in a small SOT-23-6 package, facilitating visual inspection of solder joints and reducing the overall footprint in the design. The device is characterized for operation over a wide temperature range of –40°C to +105°C, making it versatile for various industrial and consumer applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 0 | - | 5.5 | V |
| Output Voltage (VOUT) | -0.3 | - | 6 | V |
| Maximum Continuous Switch Current (IMAX) | - | - | 2 | A |
| On-Resistance (RON) | - | 52 mΩ (at VIN = 5 V) | - | mΩ |
| On-Resistance (RON) | - | 53 mΩ (at VIN = 3.3 V) | - | mΩ |
| Quiescent Current (IQ) | - | 8.3 µA (at VIN = 3.3 V) | - | µA |
| Operating Temperature (TA) | -40 | - | 105 | °C |
| Junction-to-Ambient Thermal Resistance (RθJA) | - | - | 183.2 | °C/W |
Key Features
- Configurable Rise Time: The device features a configurable slew rate, which helps reduce or eliminate power supply droop caused by large inrush currents.
- Quick Output Discharge (QOD): The TPS22918 includes a QOD pin that allows the configuration of the discharge rate of VOUT once the switch is disabled. This can be done in three ways: shorting QOD to VOUT, using an external resistor, or leaving the QOD pin floating.
- Low On-Resistance: The device has a low on-resistance of 52 mΩ (typical at VIN = 5 V) and 53 mΩ (typical at VIN = 3.3 V), reducing voltage drop and enhancing efficiency.
- Low Quiescent Current: The device has a low quiescent current of 8.3 µA (typical at VIN = 3.3 V), minimizing power consumption during standby.
- Compact Package: The load switch is available in a small SOT-23-6 package, facilitating visual inspection of solder joints and reducing design footprint.
- Wide Operating Temperature Range: The device operates over a temperature range of –40°C to +105°C, making it suitable for various industrial and consumer applications.
Applications
- Industrial Systems: Suitable for power management in industrial control systems, automation, and other industrial applications.
- Set Top Box: Used in set-top boxes for efficient power distribution and management.
- Blood Glucose Meters: Ideal for medical devices such as blood glucose meters where precise power control is necessary.
- Electronic Point of Sale (POS): Used in POS systems to manage power efficiently and reliably.
Q & A
- What is the maximum continuous switch current of the TPS22918DBVR?
The maximum continuous switch current is 2 A.
- What is the on-resistance of the TPS22918DBVR at VIN = 5 V?
The on-resistance is typically 52 mΩ at VIN = 5 V.
- What is the operating temperature range of the TPS22918DBVR?
The device operates over a temperature range of –40°C to +105°C.
- How is the quick output discharge (QOD) feature configured?
The QOD feature can be configured by shorting the QOD pin to VOUT, using an external resistor, or leaving the QOD pin floating.
- What is the typical quiescent current of the TPS22918DBVR at VIN = 3.3 V?
The typical quiescent current is 8.3 µA at VIN = 3.3 V.
- What package type is the TPS22918DBVR available in?
The device is available in a SOT-23-6 package.
- What are some common applications of the TPS22918DBVR?
Common applications include industrial systems, set-top boxes, blood glucose meters, and electronic point of sale (POS) systems.
- How does the configurable rise time feature benefit the system?
The configurable rise time helps reduce or eliminate power supply droop caused by large inrush currents.
- Can the ON pin be left floating?
No, the ON pin must be driven either high or low for proper functionality and cannot be left floating.
- What is the junction-to-ambient thermal resistance (RθJA) of the TPS22918DBVR?
The junction-to-ambient thermal resistance (RθJA) is 183.2 °C/W.
