The model "IR3897MTRPBF" belongs to Infineon Technologies. It is a Power management IC (PMIC) specifically designed for DC-DC conversion and voltage regulation. This model is commonly used in applications like computing, telecommunications, and industrial equipment.
Package Type:
The IR3897MTRPBF comes in a QFN-20 package (20 pins), which is a Quad Flat No-lead (QFN) package, meaning it has 20 pins underneath it, making it ideal for compact designs and high-density applications.
Pin Function Specification and Circuit Principle:
The IR3897MTRPBF is a buck regulator with the following pinout:
Pin # Pin Name Pin Function Description 1 VIN Input voltage (6V - 14V). 2 VOUT Output voltage (adjustable). 3 GND Ground connection. 4 EN Enable pin. High = IC on, Low = IC off. 5 SS Soft start. Controls the ramp-up of the output voltage. 6 FB Feedback voltage sensing. 7 COMP Compensation for internal control loop. 8 NC No connection. 9 SW1 Switch node 1 (high-side MOSFET connection). 10 SW2 Switch node 2 (low-side MOSFET connection). 11 PGND Power ground. 12 VCC Internal supply voltage. 13 VCCB Power supply to control circuitry. 14 VDD Power supply for high-side driver. 15 BOOST Bootstrap capacitor connection. 16 PGOOD Power good indication output. 17 VIN_FB Voltage feedback pin for input voltage regulation. 18 VOUT_FB Voltage feedback pin for output voltage regulation. 19 MODE Mode selection (PWM or PSM). 20 PGND2 Power ground 2 (additional ground connection).Circuit Principles:
Input Voltage (VIN) is provided to the IC, typically ranging from 6V to 14V. The IC uses internal switching transistor s to convert this input voltage to a stable output voltage (VOUT) through the buck conversion process. The Feedback Pins (FB, VOUTFB, VINFB) are used to sense the output and input voltages, providing the necessary information to adjust the duty cycle for maintaining a regulated output. The Compensation Pin (COMP) adjusts the control loop for optimal performance. The Soft Start (SS) pin ensures the output voltage starts gradually to reduce inrush current. The Enable Pin (EN) allows you to control whether the IC is operating. The Power Good Pin (PGOOD) signals if the output is within a valid range, indicating correct operation. Switch Nodes (SW1, SW2) connect to the switching transistors, regulating the current flow. The Bootstrap Pin (BOOST) ensures the high-side MOSFET can operate correctly, providing the voltage needed for the switching transistor.20 FAQ for IR3897MTRPBF:
Q: What is the input voltage range for IR3897MTRPBF? A: The input voltage range for IR3897MTRPBF is between 6V to 14V.
Q: What is the function of the VOUT pin in the IR3897MTRPBF? A: The VOUT pin provides the regulated output voltage, which is adjustable.
Q: What does the EN (Enable) pin do on IR3897MTRPBF? A: The EN pin enables or disables the IC; High = IC on, Low = IC off.
Q: What is the purpose of the Soft Start (SS) pin? A: The SS pin controls the output voltage's ramp-up during startup to avoid inrush current.
Q: How does the IR3897MTRPBF regulate the output voltage? A: It uses feedback from the VOUTFB and VINFB pins to adjust the duty cycle of its internal switches.
Q: What does the PGND pin represent? A: The PGND pin is the ground reference for the power circuit of the IC.
Q: What is the significance of the COMP pin on IR3897MTRPBF? A: The COMP pin is used for compensating the internal control loop to ensure stability in the regulation.
Q: Can the output voltage be adjusted in the IR3897MTRPBF? A: Yes, the output voltage is adjustable through the feedback mechanism.
Q: How many pins are there in the IR3897MTRPBF? A: The IR3897MTRPBF has 20 pins in its QFN-20 package.
Q: What does the PGOOD pin do? A: The PGOOD pin provides a signal indicating if the output voltage is within the correct range.
Q: What is the purpose of the VCCB pin in the IR3897MTRPBF? A: The VCCB pin provides the power supply for the control circuitry of the IC.
Q: What are the SW1 and SW2 pins for? A: SW1 and SW2 are the switching nodes for the internal MOSFETs , where high-side and low-side switches are connected.
Q: Is there a specific mode selection in the IR3897MTRPBF? A: Yes, the MODE pin selects between Pulse Width Modulation (PWM) and Pulse Skip Modulation (PSM).
Q: How does the IR3897MTRPBF protect against over-voltage? A: The IR3897MTRPBF has built-in protections, including over-voltage protection by regulating the feedback loops.
Q: What does the VDD pin provide in the IR3897MTRPBF? A: The VDD pin supplies power to the high-side driver of the IC.
Q: How do I disable the IC operation on IR3897MTRPBF? A: The IC can be disabled by driving the EN pin low.
Q: How do I know if the IR3897MTRPBF is functioning correctly? A: The PGOOD pin will indicate if the output is within a valid range for correct operation.
Q: What is the function of the VINFB pin? A: The VINFB pin is used for input voltage feedback to regulate the input voltage.
Q: Can the IR3897MTRPBF work without a soft start feature? A: No, the soft start feature is important for reducing inrush current and protecting the system.
Q: How should the IR3897MTRPBF be connected for proper operation? A: Ensure that all ground pins (PGND, PGND2) are connected to the same ground plane and the correct external components (e.g., capacitors, inductors) are used for stable operation.
This detailed explanation provides a comprehensive understanding of the IR3897MTRPBF pinout and functions, including the most common questions and answers related to the device. Let me know if you need further details!