TPS40422RSBT

Voltage - Supply (Vcc/Vdd):	4.5 V ~ 20 V
Supplier Device Package:	40-WQFN (5x5)
Package / Case:	40-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Frequency Control, Power Good
Serial Interfaces:	PMBus
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Frequency - Switching:	100kHz ~ 1MHz
Series:	--
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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TPS40422RSBT Application Field and Working Principle

The TPS40422RSBT is a highly integrated DC/DC synchronous step-down DC/DC converter that integrates dual switching regulators and several other features to meet the requirements of Intel Haswell and Broadwell Notebook power systems. It is a voltage regulator DC/DC switching controller typically used in power management integrated circuit (PMIC) applications.The TPS40422RSBT is designed to replace industry-standard linear regulators at the point-of-load (POL). Its primary benefit is in providing very high power efficiency, higher accuracy, and higher current delivery. Its advanced features also make implementing and managing the system power much easier than using traditional linear regulators.The typical applications for the TPS40422RSBT include but are not limited to laptop, netbook, ultrabook and tablet computing, hard disk drive (HDD) system and server adapters, battery checking and charging circuits.

Features of TPS40422RSBT

The features of TPS40422RSBT are:

• Wide input voltage range: 4.5V to 20V
• Dual synchronous step-down DC/DC converters
• Wide output voltage range: 0.8V to 13V
• Programmable frequency: 400 kHz to 1.5 MHz per converter
• Programmable soft start for each converter
• External PWM dimming with dimming range up to 1:255
• Programmable phase shedding for light-load efficiency
• Integrated soft-start and power-on reset circuit
• Internal voltage monitoring output
• Integrated over-current and short-circuit protection
• On-chip compensation
• Thermal shutdown and over-voltage protection

Working Principle of TPS40422RSBT

The TPS40422RSBT is a step-down DC/DC synchronous switching regulator with two outputs. Each output contains its own synchronous rectifier, charge pump, loop compensation, and soft start circuit. The outputs are regulated by controlling the switching of the internal step-down switching regulator, which is directly driven by the input voltage. The internal step-down switching regulator is enabled by the "VIN Enable" pin.Each output voltage is controlled by the external pulse-width modulation (PWM) signal present on the "PWM" pin. The PWM input frequency can be programmed to a frequency between 400 kHz and 1.5 MHz. When the PWM input frequency is below 1MHz, the part supports phase shedding for lighter load conditions. The output voltage can be adjusted by changing the duty cycle of the PWM signal.Internal registers are used to set the operating parameters of the TPS40422RSBT, including the switching frequency and the references. The registers are programmed via an I2C bus.The TPS40422RSBT also integrates a power-on reset, an over-current protection, an over-voltage protection, a soft-start, and a thermal shut-down circuit.

Conclusion

The TPS40422RSBT is a dual synchronous step-down DC/DC converter that is typically used in power management integrated circuit (PMIC) applications. It is designed to provide very high power efficiencies, higher accuracy, and higher current delivery compared to standard linear regulators at the point-of-load. The features of the TPS40422RSBT include wide input and output voltage ranges, programmable frequency and soft start, PWM dimming, phase shedding, and regulation via an I2C bus. The TPS40422RSBT also integrates over-current and short-circuit protection, internal voltage monitoring output, and thermal shutdown and over-voltage protection.

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