TPS54974PWP

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TPS54974PWP belongs to PMIC - Voltage Regulators - DC DC Switching Regulators. It is an extremely efficient 4A switching voltage regulator with quad output (1 Single-ended and 3 Boost), operating with an operating voltage of 6.5 to 37V.TPS54974PWP is specifically designed for industrial applications and has superior load transient performance, making it ideal for powering multiple voltage rails in high power density systems.

Applications

• Industrial, Automotive, Telecommunication, Aerospace and Defense Power Systems
• Computers
• Cellular Phone
• Display Lighting
• Power Supply Management
• Chargers

Features

• Quad output configuration (1Single-ended and 3 Boost).
• Operates from 6.5 to 37V input voltage range.
• Output voltages up to 20V.
• Up to 4A peak output current.
• Propagation delay for fast current response.
• Good transient response with programmable soft-start time.
• High efficiency : over 90 % at 9V VIN, 3V 3A and 5V 1A.
• Active current sharing.
• Low output ripple and noise.
• Wide range of operating temperature.
• Small solution size – 3 mm2.
• Adjustable switching frequency.
• Foldback mode.

Working principle

TPS54974PWP operates in a buck-boost converter architecture, with a regulation loop performing output voltage control. The device consists of an input voltage regulator with error amplifier and a linear regulator for internal bias (INTVCC) and a control circuit for the switching stages. An LDO is also included for filtering ripple and white noise.

The buck-type switch consists of a power switch, its driver and an internal bootstrap circuit for high side driver. When the output voltage is higher than the reference voltage, the buck switch is closed and the electric current flows from the input to output. When the output voltage is lower than the reference voltage, the boost-type switch is closed and the electric current flows from the output to input.

The output voltage is continuously monitored by an error amplifier. The output voltage varies according to an external feedback voltage. When the output voltage increases above the reference voltage, the filter is cut off and the error amplifier decreases the duty cycle of the PWM. When the output voltage decreases below the reference voltage, the filter is enabled and the duty cycle of the PWM increases. The error amplifier duty cycle can be adjusted by adjusting the FB voltage.

An external compensation capacitor (CC) is used for the regulation loop and for setting the response frequency of the loop. A small ceramic capacitor should be put between its feedback pin and ground to filter out noise. It is recommended to put an electrolytic capacitor across the output and ground to absorb output transients.

For current sharing,+OUT1 should be used as main output and OUT2 and3 as slave outputs. When two or more outputs are used, the external resistance between FSIN andFSOUT pins should be connected. The Tps54974pwp provides a small internal circuit to twice-divide the current output voltage. The voltage drop due to the current flow is monitored internally and it is used for current sharing regulation. This circuit will also distribute the load current for each channel to achieve better load transient response.

To protect the switching stages from overloading, a foldback function can be used. When the output current exceeds the overcurrent protection limit +IPOK, the course is shifted to the shorted loop. This allows for fast current decay and for full protection of the converter.

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