Overview
The TPS61291, produced by 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: a high-efficiency boost mode to generate an output voltage higher than the input voltage, and a bypass mode that connects the output directly to the input, allowing for low-power operation of microcontrollers.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SON (6-pin) | - |
| Body Size | 2.0 mm x 2.0 mm x 0.75 mm | - |
| Supply Voltage Range | 0.9 - 5 | V |
| Operating Ambient Temperature | -40 to 85 | °C |
| Operating Junction Temperature | -40 to 125 | °C |
| Output Voltage Options | 2.5V, 3.0V, 3.3V | - |
| Maximum Output Current | 300 mA (typical) | - |
| Quiescent Current in Bypass Mode | 15 nA (typical) | - |
| Undervoltage Lockout Threshold | 0.65 - 0.9 V | - |
| Overtemperature Protection | 140 °C with 20 °C hysteresis | - |
Key Features
- High Efficiency Boost Mode: The device operates in a high-efficiency boost mode to generate an output voltage higher than the input voltage, using a synchronous boost topology.
- Integrated Bypass Mode: Provides a direct path from the input to the output, allowing low-power microcontrollers to operate directly from the battery.
- Selectable Output Voltages: Supports three internally set output voltages: 2.5V, 3.0V, and 3.3V, set via the VSEL pin.
- Low Quiescent Current: Typically 15 nA in bypass mode, extending battery life in low-power applications.
- Overtemperature and Undervoltage Protection: Includes overtemperature protection and undervoltage lockout to ensure safe operation.
- Small Package Size: Packaged in a small 2mm x 2mm SON 6-pin package.
Applications
- Metering (Gas, Water, Smart Meters): Suitable for metering applications where low power consumption is crucial.
- Remote Controls: Ideal for remote control devices powered by single or dual battery cells.
- Home Security / Home Automation: Used in home security and automation systems that require efficient power management.
- Battery-Powered Devices: Extends battery life in applications that can run partially directly from the battery but need a boost conversion to maintain system voltage.
Q & A
- What are the operating modes of the TPS61291? The TPS61291 operates in two modes: high-efficiency boost mode and bypass mode.
- How is the output voltage set on the TPS61291? The output voltage is set via the VSEL pin, which can be connected to GND, VOUT, or left floating to select 2.5V, 3.0V, or 3.3V output voltages.
- What is the quiescent current in bypass mode? The quiescent current in bypass mode is typically 15 nA.
- What is the maximum output current of the TPS61291? The maximum output current is 300 mA (typical).
- What are the thermal protection features of the TPS61291? The device includes overtemperature protection with a threshold of 140 °C and a hysteresis of 20 °C.
- What is the purpose of the EN/BYP pin? The EN/BYP pin selects the operating mode of the device; pulling it low enables bypass mode, while pulling it high enables boost mode.
- What are the recommended external components for the TPS61291? The device requires an input capacitor, output capacitor, and an inductor for operation.
- What is the package size of the TPS61291? The device is packaged in a 2mm x 2mm SON 6-pin package.
- What are some typical applications of the TPS61291? Typical applications include metering, remote controls, home security/home automation, and battery-powered devices.
- How does the TPS61291 extend battery life in applications? The device extends battery life by operating in bypass mode when possible and switching to boost mode only when necessary to maintain system voltage.
