TPS62684YFFT

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TPS62684YFFT is an integrated power stage, pulse-width modulation (PWM) controller and diode emulation mode (DEM) switch for low-voltage applications that consume low quiescent current (IQ). This device is designed primarily for step-down DC/DC converters that require top performance, such as mobile phones, tablet computers, and smart accessories. This application field provides several features and a significant level of integration that make it suitable for a wide range of products operating from a single cell Li-Ion battery (3.3V to 5.5V) or from two cell Li-Ion batteries (4.2V to 5.5V). Furthermore, the high switching frequency of 1 MHz allows the use of small form factor surface mount inductors and capacitors with good efficiency while reducing high-frequency noise.

The TPS62684YFFT DC/DC switching regulator is a step-down converter that includes an internal power switch, PWM regulation, and internal synchronous rectifier control. Its operating principle relies mainly on controlling the pulse width modulated (PWM) signal that charges the output capacitors to the desired voltage. When the duty cycle is low, the converter delivers less output power. The PWM signal is generated by the PWM controller based on the voltage difference between the output voltage and the reference voltage set by external components. The integrated feedback loop further ensures the output voltage noise is minimized and the current limit is accurately maintained.

The circuit\'s main components are an input capacitor, a power switch, an inductor, an output capacitor, and a series of feedback resistors. When the PWM signal is in high state, the power switch is turned on, allowing current to flow through the inductor and allowing the input voltage to charge the output capacitor. During the low-state of the PWM signal, the power switch is off and a current path from the output capacitor is established. This causes the output of the regulator to discharge and provide power to the load.

The maximum output current of the regulator is limited by the current sense circuitry which monitors the input current flowing into the IC. The device is also protected by a thermal shutdown feature which disables the output of the device if the junction temperature exceeds 150°C. Furthermore, an optional external pull-down resistor can be used to aid in dropout prevention at light load conditions.

The TPS62684YFFT DC/DC switching regulator is efficient, cost effective, and is suitable for a variety of applications in the consumer electronics and automotive markets, such as smartphone and tablet charger, vehicle battery charger, and laptop adapter. It is rated for a maximum input voltage of 5.5V and has a maximum output current of 3A.

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