The model number " LTM4615IV#PBF " refers to an integrated circuit (IC) manufactured by Analog Devices, a leading provider of high-performance analog, mixed-signal, and digital signal processing ( DSP ) ICs.
Pin Function Specifications and Circuit Principle Instructions:
The LTM4615IV#PBF is part of the LTM4615 family of products, which are switching regulators designed for high efficiency and precise voltage regulation. This specific model is a Step-Down (Buck) Switching Regulator with an integrated Power module . It typically comes in a QFN (Quad Flat No-lead) package with 36 pins, though there may be variations in pin count for different packages.
Pinout Description (36 Pins):
Below is a detailed list of pin functions for the LTM4615IV#PBF package with 36 pins, presented in tabular format.
Pin Number Pin Name Pin Function Description 1 VOUT Output Voltage: The regulated output voltage is available here. Typically used to power loads. 2 VOUT_SENSE Voltage Sense for the output, used to monitor and regulate the output voltage level. 3 VDD Input Voltage Supply: Power input for the regulator. Typically 4.5V to 28V. 4 PGND Power Ground: This pin connects to the power ground of the system. 5 EN Enable: Used to enable or disable the operation of the regulator. A low logic disables it. 6 SYNC Synchronization: A clock input for synchronizing the regulator with an external clock. 7 VIN Input Voltage: Supplies the input voltage to the switching regulator. 8 PGOOD Power Good: Indicates whether the output voltage is within the specified range. 9 SENSE+ Voltage sense for input voltage, provides feedback to maintain regulation. 10 VDD_IO Power supply for internal logic and control. 11 GND Ground: General ground connection. 12 SENSE- Voltage sense pin for the negative side of input voltage. 13 VOUT1 Output Voltage 1: Second output voltage, typically used in multi-output configurations. 14 VOUT2 Output Voltage 2: Third output voltage, for different power rails. 15 VOUT3 Output Voltage 3: Another optional output voltage. 16 SW Switch Pin: Used for the internal switching circuit. 17 SW_EN Switch Enable: Enables or disables the internal switching function. 18 SENSE1+ Sense input for additional sensing of the output voltage. 19 SENSE1- Sense input for additional sensing of the output voltage. 20 SW1 Switching Node 1: One of the high-speed switching nodes of the regulator. 21 SW2 Switching Node 2: Another switching node, often used for two-phase operation. 22 SW3 Switching Node 3: Additional phase node for multi-phase regulation. 23 PGND1 Power Ground 1: Connects to the power return path. 24 PGND2 Power Ground 2: Connects to the power return path for multiple outputs. 25 PGND3 Power Ground 3: Additional power ground path for multi-output configuration. 26 EXTERNAL_CS External Current Sense Pin: For monitoring the output current through an external sense resistor. 27 EXTERNAL_OC External Overcurrent Protection Pin: For sensing external overcurrent protection signals. 28 EXTERNAL_OCP External Overcurrent Protection Pin: Another overcurrent protection input. 29 VDD_EXT External Power Supply Pin: Can provide power for external modules or circuits. 30 OVP Overvoltage Protection Pin: Monitors output voltage for overvoltage conditions. 31 UVLO Under-voltage Lockout Pin: Senses if the input voltage falls below the set threshold. 32 ITH Internal Voltage Control Pin: Sets the output voltage regulation loop. 33 SGND Signal Ground: Ground for the signal section of the circuit. 34 NC No Connection: This pin is not used. 35 VOUT_NC Not connected to the output voltage directly. 36 PGND_NC No Connection to the power ground.Common FAQ (Frequently Asked Questions):
Here are 20 common questions and answers regarding the LTM4615IV#PBF model, explained in detail:
Q: What is the maximum input voltage for the LTM4615IV#PBF? A: The maximum input voltage for the LTM4615IV#PBF is 28V.
Q: How do I enable the LTM4615IV#PBF? A: To enable the LTM4615IV#PBF, you must apply a logic high signal (above 1.5V) to the EN pin.
Q: What is the output voltage range of the LTM4615IV#PBF? A: The output voltage of the LTM4615IV#PBF can range from 0.8V to 15V, depending on the external feedback configuration.
Q: Can the LTM4615IV#PBF be used for multiple output voltages? A: Yes, the LTM4615IV#PBF can provide multiple output voltages with separate output pins such as VOUT1, VOUT2, and VOUT3.
Q: What type of package is the LTM4615IV#PBF in? A: The LTM4615IV#PBF is typically packaged in a QFN (Quad Flat No-lead) package with 36 pins.
Q: Can the LTM4615IV#PBF be synchronized with an external clock? A: Yes, the LTM4615IV#PBF has a SYNC pin that can accept an external clock for synchronization.
Q: What does the PGOOD pin indicate? A: The PGOOD pin indicates if the output voltage is within the specified range. A high signal means the output is within tolerance.
Q: How do I adjust the output voltage of the LTM4615IV#PBF? A: The output voltage can be adjusted using external resistors in the feedback loop connected to the SENSE pins.
Q: Does the LTM4615IV#PBF have overcurrent protection? A: Yes, the LTM4615IV#PBF includes both internal and external overcurrent protection through various sensing pins.
Q: What is the role of the SW pin in the LTM4615IV#PBF? A: The SW pin is used as a high-speed switching node in the internal power conversion circuit.
Q: Is thermal management needed when using the LTM4615IV#PBF? A: Yes, appropriate thermal management practices, including heat sinks or adequate PCB layout for heat dissipation, are recommended.
Q: What is the function of the ITH pin? A: The ITH pin is used to adjust the voltage loop compensation and control the output voltage regulation loop.
Q: Can the LTM4615IV#PBF be used in automotive applications? A: Yes, the LTM4615IV#PBF is designed to handle automotive-grade input voltage ranges and can be used in automotive power supplies.
Q: How does the LTM4615IV#PBF handle input voltage drops (UVLO)? A: The LTM4615IV#PBF includes an Under-voltage Lockout (UVLO) function that prevents operation if the input voltage is below a certain threshold.
Q: What is the current capability of the LTM4615IV#PBF? A: The LTM4615IV#PBF can deliver up to 15A of output current, depending on the output voltage configuration and thermal conditions.
Q: What happens if the output voltage exceeds the set value? A: If the output voltage exceeds the set value, the Overvoltage Protection (OVP) feature will trigger, shutting down the regulator to protect the load.
Q: Can the LTM4615IV#PBF operate without an external clock signal? A: Yes, the LTM4615IV#PBF can operate without an external clock, using its internal switching controller.
Q: What is the typical efficiency of the LTM4615IV#PBF? A: The typical efficiency of the LTM4615IV#PBF is around 90% depending on the output voltage and load conditions.
Q: How is the LTM4615IV#PBF protected from thermal overload? A: The LTM4615IV#PBF includes thermal shutdown protection that disables the regulator if the junction temperature exceeds safe operating limits.
Q: Can the LTM4615IV#PBF be used in high-frequency switching applications? A: Yes, the LTM4615IV#PBF is designed to operate efficiently at high switching frequencies, typically in the range of hundreds of kHz to MHz.