TPS61121PWRG4

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TPS61121PWRG4 is a specialized power management integrated circuit (PMIC). It provides a complete range of single-supply or dual-supply DC/DC buck converter to optimize battery powered and other applications for portable and consumer electronics designs.

The TPS61121PWRG4 is a monolithic 0.5A buck converter. It is also available a version of TPS61121PWRG4-L with a 0.25A current limit. The device is designed to support a wide range of power budgets and operating conditions. It supports single and dual input sources enabling flexibility for powering from a single Li-Ion battery for majority of battery-operated devices. The TPS61121PWRG4 includes a full-featured adaptive on-time control loop, providing fast transient response, with low output ripple and high power efficiency, while varying load and source conditions. The adjustable output voltage (1.0V to 5.5V) and high conversion frequency (3.3MHz) enable smaller external components such as inductor and capacitors.

The TPS61121PWRG4 is a space efficient solution, with just ten active components, enabling lowest total cost (BOM) with best quality. The TPS61121PWRG4 also eliminates the need for Schottky diode in the main loop, resulting in greater efficiency in the system than a similar synchronous solution. It also integrates power MOSFETs for both VIN and VOUT, eliminating the need for external MOSFETs. The TPS61121PWRG4 integrates protection features such as Line Under Voltage Lockout (UVLO), over current and short circuit protection.

The TPS61121PWRG4 is designed to provide a versatile, efficient and cost effective power supply solution for applications powered from a battery or a single source quality power supply. It provides a wide input voltage range (2.6V to 6.0V) and adjustable output voltage range (1.0V to 5.5V). It includes features such as Soft-Start and output current fold back, adjustable frequency and adjustable current limit.

The TPS61121PWRG4 is designed for a wide range of applications such as portable medical devices, digital cameras, digital video recorders, portable media players, portable navigation devices, and wireless handsets. It is ideal for powering digital sensor and wireless communication applications where wider input and output voltage range, better transient response with faster line and load transient response is required.

The working principle of the TPS61121PWRG4 is simple and effective. The TPS61121PWRG4 device uses a voltage mode Adaptive On-Time Control Loop to regulate the output voltage. The device includes a voltage reference, a current sense amplifier, a comparator and two oscillators. An internal clock oscillator sets the switching frequency, while a loop compensation capacitor determines the loop response. When the output voltage deviates from its set point, the error amplifier compares the output voltage to the reference voltage generating a signal that controls the ON time of the internal power switch of the device.

The TPS61121PWRG4 is also equipped with several features including a Soft-Start circuit for limiting the in-rush current at start-up, an Over Current Limiting circuit at output to reduce the power dissipation of the internal MOSFETs and an Output Current Fold Back circuit to protect the power MOSFETs from overload. The integrated power MOSFETs reduce the component count and decrease system cost, as the external Schottky diode is eliminated.

In summary, the TPS61121PWRG4 is an ideal solution for providing a cost-effective, robust and efficient power supply solution in battery-powered and other applications such as portable and consumer electronic designs. It supports a wide input voltage range of 2.6V to 6.0V, wide output voltage range up to 5.5V, adjustable frequency up to 3.3 MHz, adjustable output current limit, soft start and output current fold back features. It integrates two power MOSFETs, eliminating the need for external Schottky diode. It offers fast transient response, low output ripple and high power efficiency. Its protection features ensure device robustness and system safety.

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