Overview
The TPS62240DRVR from Texas Instruments is a high-efficiency synchronous step-down DC-DC converter. It operates at a fixed switching frequency of 2.25 MHz and is designed to provide an output current of up to 300 mA. This device is available in a compact 2 x 2 WSON package, making it suitable for space-constrained applications. The TPS62240DRVR supports a wide input voltage range from 2 V to 6 V, which includes two- and three-cell alkaline batteries and Li-ion batteries. It features an adjustable output voltage from 0.6 V to the input voltage, and fixed output voltage options are also available. The converter enters power save mode at light load currents to maintain high efficiency across the entire load current range.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range (VIN) | 2 | 6 | V | |
| Output Current (IOUT) | 300 | mA | ||
| Switching Frequency (fSW) | 2 | 2.25 | 2.5 | MHz |
| Output Voltage Range (VOUT) | 0.6 | VIN | V | |
| High-Side MOSFET ON-Resistance (RDS(on)) | 240 | 480 | mΩ | |
| Low-Side MOSFET ON-Resistance (RDS(on)) | 180 | 380 | mΩ | |
| Shutdown Current (ISD) | 0.1 | 1 | μA | |
| Undervoltage Lockout Threshold (UVLO) | 1.85 | 1.95 | V | |
| Start-Up Time (tStart Up) | 500 | μs | ||
| VOUT Ramp-Up Time (tRamp) | 250 | μs |
Key Features
- High Efficiency: Greater than 94% efficiency, especially beneficial for battery-powered devices.
- Wide Input Voltage Range: Supports input voltages from 2 V to 6 V, including Li-ion batteries and two- and three-cell alkaline batteries.
- Adjustable Output Voltage: Output voltage can be adjusted from 0.6 V to the input voltage using an external resistor divider. Fixed output voltage options (e.g., 1.2 V, 1.8 V) are also available.
- Power Save Mode: Automatically enters power save mode at light load currents to maintain high efficiency. This mode uses pulse frequency modulation (PFM) to reduce switching frequency and quiescent current.
- Fixed-Frequency PWM Mode: Can be forced into fixed-frequency PWM mode via the MODE pin for noise-sensitive applications.
- Low Output Voltage Ripple: Optimized for low output voltage ripple during PFM mode operation.
- Compact Package: Available in a 2 x 2 WSON package, suitable for space-constrained designs.
Applications
The TPS62240DRVR is suitable for a variety of applications requiring high efficiency and compact design, including:
- Battery-powered devices such as smartphones, tablets, and portable electronics.
- Industrial control systems and automation equipment.
- Medical devices that require efficient power management.
- Aerospace and defense systems where space and efficiency are critical.
- Consumer electronics such as digital cameras and handheld gaming devices.
Q & A
- What is the input voltage range of the TPS62240DRVR?
The input voltage range is from 2 V to 6 V.
- What is the maximum output current of the TPS62240DRVR?
The maximum output current is up to 300 mA.
- What is the switching frequency of the TPS62240DRVR?
The switching frequency is 2.25 MHz.
- Can the output voltage of the TPS62240DRVR be adjusted?
Yes, the output voltage can be adjusted from 0.6 V to the input voltage using an external resistor divider.
- What is the power save mode in the TPS62240DRVR?
The power save mode is a feature that reduces the switching frequency and quiescent current at light load currents to maintain high efficiency.
- How does the MODE pin affect the operation of the TPS62240DRVR?
The MODE pin allows selection between forced PWM mode and power save mode. Pulling the MODE pin high forces fixed-frequency PWM mode, while connecting it to GND enables power save mode.
- What is the typical start-up time of the TPS62240DRVR?
The typical start-up time is 500 μs.
- What is the thermal shutdown temperature of the TPS62240DRVR?
The thermal shutdown temperature is 140°C.
- Is the TPS62240DRVR suitable for noise-sensitive applications?
Yes, it can be forced into fixed-frequency PWM mode via the MODE pin for noise-sensitive applications.
- What package options are available for the TPS62240DRVR?
The device is available in a 2 x 2 WSON package.
