An Introduction to TPS54302DDCR Synchronous Buck Converter
28 March 2024
Ⅱ. Characteristics of TPS54302DDCR
Ⅲ. Simplified schematic of TPS54302DDCR
Ⅳ. What are the advantages of TPS54302DDCR?
Ⅴ. Technical parameters of TPS54302DDCR
Ⅵ. Pin configuration and functions of TPS54302DDCR
Ⅶ. Protection functions and implementation methods of TPS54302DDCR
The TPS54302DDCR is a synchronous buck converter produced by Texas Instruments with an input voltage range of 4.5V to 28V and an output current of up to 3A. The device integrates two switching FETs, internal loop compensation, and a 5ms internal soft-start function, effectively reducing component count. By integrating MOSFETs and using SOT-23 package, the TPS54302DDCR not only achieves high power density, but also takes up minimal space on the PCB. Its advanced eco mode design can maximize efficiency at light load and significantly reduce power loss. In addition, TPS54302DDCR also introduces spread spectrum operation, which effectively reduces electromagnetic interference (EMI). Under overload conditions, the converter is protected by cycle-by-cycle current limiting in the two high-side MOSFETs, and freewheeling current limiting in the low-side MOSFET prevents runaway current. If the overcurrent condition lasts longer than the set threshold, hiccup mode will be triggered for protection. This chip adopts an adjustable fixed-frequency PWM control mode, so that the input and output voltages and over-current protection current can be flexibly adjusted. At the same time, TPS54302DDCR is also equipped with short-circuit protection and over-temperature protection functions to ensure that the circuit and chip can operate safely under various working conditions and prevent potential safety risks.
Alternatives and equivalents:
• APW7070AKAI-TRG
• LMR33640ADDAR
• Overvoltage protection
• Thermal shutdown
• Internal 5-ms soft start
• Peak current-mode control
• Internal loop compensation
• Fixed 400-kHz switching frequency
• 4.5-V to 28-V wide input voltage range
• Frequency spread spectrum to reduce EMI
• Advanced Eco-mode™ pulse skip
• Low 2-μA shutdown, 45-μA quiescent current
• Overcurrent protection for both MOSFETs with hiccup mode protection
• Integrated 85-mΩ and 40-mΩ MOSFETs for 3-A, continuous output current
TPS54302DDCR has the following main advantages:
1. Compact design: TPS54302DDCR adopts SOT-23 package, which is characterized by small size and easy wiring. The compactness of this package is conducive to saving space and increasing power density.
2. Perfect protection mechanism: The chip has a variety of protection mechanisms, including over-current protection, over-temperature protection and short-circuit protection, which can effectively prevent circuit damage and accidents. These protection mechanisms improve the safety and stability of the system.
3. Excellent thermal performance: The TPS54302DDCR adopts a design with good thermal performance, which enables the chip to maintain stable performance under high load and high temperature environments. This helps ensure long-term stable operation of the device and improves system reliability.
4. High integration: The chip integrates two switching FETs, reducing the number of external components, which simplifies circuit design and lowers manufacturing costs. Meanwhile, integrated loop compensation and soft-start functions further enhance its ease of use and reliability.
5. High efficiency: The TPS54302DDCR is a high-efficiency step-down converter capable of delivering a stable output voltage over a wide input voltage range (4.5V to 28V). By adopting advanced synchronous rectification technology, it is able to achieve low loss and high efficiency, which helps to prolong the use of equipment and reduce energy waste.
• Part Status: Active
• Package / Case: SOT-23-Thin-6
• Packaging: Tape and Reel
• Switching Frequency: 400 kHz
• Quiescent Current: 45 uA
• Operating Supply Current: 40 uA
• Operating Temperature: -40°C ~ 125°C
• Pin Count: 6
• Mounting Style: SMD/SMT
• Number of Outputs: 1 Output
• Product Category: Switching Voltage Regulators
• Package Length/Width/Height: 3.05(Max)/ 1.75(Max)/1(Max)
• Pin 1 (GND): Ground pin source terminal of low-side power NFET as well as the ground terminal for controller circuit. Connect sensitive VFB to this GND at a single point.
• Pin 2 (SW): Switch node connection between high-side NFET and low-side NFET.
• Pin 3 (VIN): Input voltage supply pin. The drain terminal of high-side power NFET.
• Pin 4 (FB): Converter feedback input. Connect to output voltage with feedback resistor divider.
• Pin 5 (EN): This pin is the enable pin. Float the EN pin to enable.
• Pin 6 (BOOT): Supply input for the high-side NFET gate drive circuit. Connect a 0.1-μF capacitor between BOOT and SW pins.
TPS54302DDCR has the following protection functions:
1. Output under-voltage protection
Output under-voltage protection prevents the output voltage from falling below the safety threshold and causing damage. Normally, the TPS54302DDCR monitors the output voltage and compares it to a preset threshold. Once it detects that the output voltage is below the safe threshold, it will take measures to protect its internal circuits and external loads.
2. Overtemperature protection
Overtemperature protection prevents the TPS54302DDCR from being damaged by overheating in a high temperature environment. Usually, the chip has a well-integrated internal over-temperature protection mechanism. This feature makes it possible to automatically take protective measures in the face of performance degradation or even damage that may be caused by excessive internal temperature, ensuring system stability and device safety.
3. Input under-voltage lockout protection
Input under-voltage lockout protection ensures that the TPS54302DDCR will not operate when the input voltage falls below a specific minimum threshold, thus preventing startup under inappropriate input voltage conditions. This function is usually realized by internal circuitry. When the input voltage is detected to be lower than the preset safety threshold, the chip will stop operation or automatically switch to low-power mode.
4. Short-circuit protection
Short-circuit protection prevents the chip and other devices from being damaged when there is a short-circuit at the output. Typically, short-circuit protection is realized by monitoring the output current and comparing it to a preset threshold. Once a short circuit is detected at the output, the TPS54302DDCR will take immediate action, such as reducing the output current or turning off the output to prevent damage.
5. Overload protection
The TPS54302DDCR has an overload protection function, which means that it is able to automatically activate a protection mechanism when the circuit load exceeds its rated capacity. This protection mechanism ensures that the device operates without damage, as it will limit excessive current flow through the circuit, thus preventing components from being damaged due to overheating or other reasons.
TPS54302DDCR has a wide range of applications. First of all, it can be used in automotive electronic systems, such as driving recorders, navigation systems and car audio. It can provide high-quality power to ensure that these electronic devices work stably in the harsh working environment of automobiles. Secondly, the chip can also be used for power management in electronic devices, such as computers, communication equipment and network equipment. Due to its high efficiency and stability, it is able to provide stable and reliable power supply to these devices. In addition, TPS54302DDCR is also suitable for industrial automation equipment, medical equipment, consumer electronics and other fields.
Frequently Asked Questions
1. What is the operating temperature range of TPS54302DDCR?
The operating temperature of TPS54302DDCR ranges from -40°C to 125°C.
2. What is the primary function of the TPS54302DDCR?
The primary function of the TPS54302DDCR is to step down voltage efficiently in power supply applications.
3. What is the replacement and equivalent of TPS54302DDCR?
You can replace the TPS54302DDCR with APW7070AKAI-TRG, LMR33640ADDAR, TPS54200DDCR or TPS54302DDCT.
4. What are some typical applications of the TPS54302DDCR?
Typical applications of the TPS54302DDCR include point-of-load regulation, industrial power supplies, battery-powered devices, and various other voltage conversion applications.
