TPS61131PWR

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TPS61131PWR Application Field and Working Principle

High performance linear regulators and switching regulators are the two dominant types of voltage regulators available today. The Texas Instruments TPS61131PWR is a high power, wide input voltage range, low noise and high efficiency, integrated buck regulator. It is a Multi-Mode PWM controller plus a high-side MOSFET driver. The TPS61131PWR is designed to be used in different battery-powered systems such as small form factor portable devices and mobile phones.

Features of TPS61131PWR

• Input voltage range: 3V to 6.5V
• Output voltage: adjustable from 0.6V to VIN
• Output current capability: 3A
• Light-load current consumption: 2.7uA
• Switching frequency: up to 2.2MHz
• 4MHz PWM-skip mode for reduced noise
• Overcurrent and over-temperature protection

Applications

The TPS61131PWR is used in a variety of applications such as data back-up, portable medical devices, PDAs, cell phones and many other battery-powered applications that require a stable, low output voltage.

Working Principle

The TPS61131PWR uses a buck topology to convert the input voltage to a lower output voltage. The device operates in two modes: PWM Mode and PWM Skip Mode. In PWM Mode, the device switches with a fixed frequency and adjusts the ON time of the switch to control the output voltage. The frequency of the PWM signal is determined by an external resistor connected to the PWM pins. In PWM Skip Mode, the TPS61131PWR skips some of the pulses and operates at a lower frequency. This reduces noise and increases efficiency. The TPS61131PWR also has an internal voltage feedback loop that compares the output voltage to that of a voltage reference and adjusts the ON time of the switch accordingly.

Conclusion

The TPS61131PWR is a high power, wide input voltage range, low noise and high efficiency, integrated buck regulator from Texas Instruments. It is designed to be used in different battery-powered systems such as small form factor portable devices and mobile phones. It is also used in data back-up, portable medical devices, PDAs and cell phones. The TPS61131PWR works in two modes: PWM Mode and PWM Skip Mode. The frequency of the PWM signal is determined by an external resistor connected to the PWM pins and the device also has an internal voltage feedback loop that adjusts the ON time of the switch accordingly.

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