TPS62222DDCTG4

Voltage - Output (Min/Fixed):	1.8V
Base Part Number:	TPS62222
Supplier Device Package:	SOT-23-5
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	1.25MHz
Current - Output:	400mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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TPS62222DDCTG4 Applications and Working Principles

The TPS62222DDCTG4 is a monolithic synchronous step-down DC-DC converter designed and manufactured by Texas Instruments (TI). This low-power device supports a wide range of applications such as battery-powered equipment, portable electronics, wireless communications, and automotive and industrial applications. It is part of TI’s Power Management IC (PMIC) Voltage Regulators and DC DC Switching Regulators family.

Design Overview

The TPS62222DDCTG4 comes in a small 10-Pin PowerPAD™ package, providing space savings and improved thermal performance. The device also integrates an integrated soft start capacitor that helps to reduce output voltage overshoot and slew rate undershoot. The device incorporates a wide input voltage range of 3 V to 17 V, while its adjustable output voltage range is between 0.8 V and 16 V. Its switching frequency can be adjusted through the external Resistive-divider and can range up to 1 MHz. The device also integrates full protection and monitoring features such as: overload protection, thermal shutdown, cycle-by-cycle peak current limit, programmable power good output and adjustable soft start.

Working Principle

The TPS62222DDCTG4 features a regulating system controlled by a frequency modulated PWM comparator Enhanced Nonlinear-tolerant PWM (ENTPWM). This function compares the feedback of the switching cycle to the reference voltage, such that the error between the output voltage and set-point of the reference is minimized. The application features a topology called synchronous buck, which contains a Costar-to-Costar diode, a MOSFET transistor, an inductor, and a capacitor. The working principle of a synchronous buck is as follows. During each cycle, the device switches on the upper power MOSFET, which starts to charge the inductor. While the power MOSFET is on, the integrated Costar-to-Costar diode remains in the off-state. As the gateway voltage continues to increase, the upper power MOSFET is switched off and the Costar-to-Costar diode turns on and the inductor discharges its cap Voltage through the diode. This cycle continues while the pulse width modulation comparator ensures that the output voltage remains in agreement with the setpoint voltage.

Conclusion

The TPS62222DDCTG4 is a low-power DC-DC synchronous buck converter designed and manufactured by TI. It supports a wide range of applications and features an integrated soft-start capacitor to reduce output voltage overshoot and slew rate undershoot. The device’s regulating system is controlled by a frequency modulated PWM comparator (ENTPWM). This device is a part of TI’s PMIC Voltage Regulators and DC DC Switching Regulators family.

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