Overview
The TPS61291DRVT from Texas Instruments is a highly integrated low-Iq boost converter with an integrated bypass mode. This device is designed to provide high efficiency and low quiescent current, making it suitable for battery-powered applications. It supports two operating modes: boost mode to generate an output voltage higher than the input voltage, and bypass mode, which connects the output directly to the input, allowing low-power microcontrollers to operate directly from the battery.
The device is packaged in a small 2mm x 2mm WSON-6 package, making it ideal for space-constrained designs. It can operate from a single 3V Li-MnO2 battery or dual 1.5V alkaline battery cells, and it extends battery life by switching to boost mode when the battery voltage drops.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | WSON-6 | - |
| Package Size | 2.0 mm x 2.0 mm x 0.75 mm | - |
| Input Voltage Range | 0.9 to 5 | V |
| Output Voltage Options | 2.5V, 3.0V, 3.3V | - |
| Maximum Output Current | 700 mA (typical) | - |
| Operating Temperature Range | -40 to 85 | °C |
| Junction Temperature Range | -40 to 125 | °C |
| Quiescent Current in Bypass Mode | 15 nA (typical) | - |
| Main Switch On Resistance | 0.4 Ω (VOUT = 3.3V) | - |
| Bypass Switch On Resistance | 1.2 Ω (VIN = 1.8V, IOUT = 50 mA, EN/BYP = low) | - |
Key Features
- Selectable Output Voltages: Internally set output voltages of 2.5V, 3.0V, and 3.3V through the VSEL pin.
- Bypass Mode: Provides a direct path from the input to the system, allowing low-power microcontrollers to operate directly from the battery.
- High Efficiency: Achieved through a synchronous boost topology and hysteretic current mode architecture.
- Low Quiescent Current: Typically 15 nA in bypass mode, supporting low-power modes of microcontrollers.
- Thermal Protection: Includes thermal shutdown and undervoltage lockout for robust operation.
- Small Package Size: 2mm x 2mm WSON-6 package, suitable for space-constrained designs.
- Overvoltage Protection: Prevents charge stored in the output capacitor from flowing back to the input during boost mode operation.
Applications
- Metering Systems: Suitable for gas, water, and smart meters due to its low power consumption and high efficiency.
- Remote Controls: Ideal for remote control devices powered by single or dual battery cells.
- Home Security and Home Automation: Used in systems that require low power consumption and reliable voltage regulation.
- Battery-Powered Devices: Extends battery life by switching between bypass and boost modes based on the battery voltage.
Q & A
- What is the package type and size of the TPS61291DRVT?
The TPS61291DRVT is packaged in a 2mm x 2mm WSON-6 package.
- What are the available output voltage options for the TPS61291DRVT?
The device supports output voltages of 2.5V, 3.0V, and 3.3V, selectable through the VSEL pin.
- What is the typical quiescent current in bypass mode?
The typical quiescent current in bypass mode is 15 nA.
- How does the device switch between boost and bypass modes?
The device switches between boost and bypass modes based on the state of the EN/BYP pin. A high level on the EN/BYP pin enables boost mode, while a low level enables bypass mode.
- What is the maximum output current of the TPS61291DRVT?
The maximum output current is typically 700 mA.
- What are the operating temperature ranges for the TPS61291DRVT?
The operating temperature range is -40°C to 85°C, and the junction temperature range is -40°C to 125°C.
- Does the TPS61291DRVT have thermal protection features?
Yes, it includes thermal shutdown and undervoltage lockout for robust operation.
- What types of batteries can the TPS61291DRVT operate with?
The device can operate with a single 3V Li-MnO2 battery or dual 1.5V alkaline battery cells.
- How does the device extend battery life?
The device extends battery life by switching to boost mode when the battery voltage drops, ensuring the system maintains a sufficient operating voltage.
- What are some typical applications for the TPS61291DRVT?
Typical applications include metering systems, remote controls, home security and home automation systems, and other battery-powered devices.
