TPS61256YFFR

Voltage - Output (Min/Fixed):	5V
Base Part Number:	TPS61256
Supplier Device Package:	9-DSBGA (1.2x1.3)
Package / Case:	9-UFBGA, DSBGA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	3.5MHz
Current - Output:	2.4A (Switch)
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	4.85V
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The TPS61256YFFR (hereafter referred to as simply the “TPS”) is a DC-DC converter with a buck topology, capable of converting a range of input voltages into a single, adjustable output voltage. It is primarily used in mobile devices and automotive applications. This article expands on the application field and working principle of the TPS61256YFFR.

Application Field

The TPS is a cost-effective buck regulator with integrated FETs. It provides a 3.5A/(VIN-VOUT 0.5V) maximum load rate, suitable for applications such as RFid, Near Field Communications, White goods, power tools, and automotive electronics, which require a reliable, low-cost DC-DC converter. The TPS can operate between 1.8V and 5.5V, making it well suited for applications with a wide range of power supply voltages.

Protection Features

One of the key features of the TPS is its wide range of protection mechanisms. It offers over-temperature protection, over-voltage protection, over-current protection, and under-voltage lockout. The TPS also supports a low-power mode which reduces the power consumption when the device is not in use.

Control Modes

The TPS can be controlled in multiple ways, depending on the application requirements. It can be controlled using Pulse Width Modulation (PWM), or using an external resistor. The TPS also offers a low-ripple synchronous rectification and a low-ripple burst mode control. In addition, the TPS can be programmed via an I2C interface to further customize operations.

Working Principle

The TPS operates by switching a power device on and off at a frequency determined by an internal oscillator. This is referred to as a buck converter topology. The power device is a power MOSFET which acts as a switch. This switch is turned on and off at a frequency defined by the oscillator, allowing for a regulated output voltage. The output voltage is regulated by adjusting the duty cycle of the power device. When the load increases, the duty cycle is increased to maintain the output voltage. The TPS also offers the option of an external current sense resistor which allows the output current to be limited.

Conclusion

The TPS61256YFFR is a cost-effective, highly integrated buck topology DC-DC converter. It is suitable for a wide range of applications where a reliable, low cost DC-DC converter is needed. The TPS offers a wide range of protection features and can be controlled using Pulse Width Modulation, an external resistor, or an I2C interface. The TPS operates by switching a power device on and off at a frequency determined by an internal oscillator, allowing for a regulated output voltage.

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