The component you mentioned, "TPS82140SILR," is part of the Texas Instruments product line. It is a Power Management IC (PMIC) that combines a buck converter and other related functionalities.
Packaging and Pin Functions Overview
The TPS82140SILR comes in a QFN-40 (Quad Flat No-lead) package, which includes 40 pins. Below, I’ll provide a detailed explanation of the pin functions, specifications, and a circuit principle outline.
Pin Function List for the TPS82140SILR (QFN-40 Package) Pin Number Pin Name Pin Function Description 1 VOUT Output Voltage pin. Provides the regulated output voltage from the integrated DC/DC converter. This voltage is set by external resistors connected to the feedback pins. 2 PGND Power Ground pin. This is the main ground for the power conversion circuitry, including the power stage and ground for external components. 3 VIN Input Voltage pin. Supplies the input voltage for the DC/DC converter. Must be within the specified operating range (typically 3.0V to 5.5V). 4 VOSENSE Voltage Sense pin. Monitors the output voltage and provides feedback to regulate the output precisely. 5 EN Enable pin. A logic-level signal that enables or disables the device. A high signal enables the device, while a low signal disables it. 6 RT/CLK Timing Resistor/ Clock pin. Used to set the switching frequency of the device by connecting a resistor to ground, or it can be used as a clock input. 7 NC No Connect pin. This pin is not internally connected and can be left floating. 8 VCC Supply Voltage pin. Provides the necessary supply voltage to power internal circuitry of the device. Typically connected to the input voltage (VIN). 9 SW Switch pin. Connects to the inductor and is used to switch the power to provide the regulated output voltage. 10 PHASE Phase pin. Used for internal signal generation to control the switching transistor s. 11 FB Feedback pin. This pin is used to provide feedback to regulate the output voltage. An external resistor divider is connected here to set the output voltage. 12 LDOOUT Low Dropout Regulator Output pin. Supplies a separate regulated voltage to low power circuitry within the device. 13 PGOOD Power Good pin. Outputs a high signal when the output voltage is within the proper range, indicating the device is operating correctly. 14 PGND Power Ground pin. Common ground for the power stage. 15 AVIN Analog Input Voltage pin. Used to supply voltage to analog circuitry of the device. 16 VREG Internal Voltage Regulator pin. Provides internal voltage regulation to power internal control logic. 17 FREQSEL Frequency Select pin. Used to select the switching frequency of the device. A resistor is connected to this pin to set the frequency range. 18 MODE Mode Select pin. Allows the user to select between forced PWM or Eco-mode operation. 19 RTN Return pin for internal control circuitry. 20 COM Common pin. Used for signal references. 21 COMP Compensation pin. External components are used to compensate the control loop for stability and response speed. 22 LDRV Low-side Driver pin. Controls the low-side switching transistor within the power stage. 23 HDRV High-side Driver pin. Controls the high-side switching transistor within the power stage. 24 CBOOT Bootstrap capacitor pin. A capacitor connected here helps drive the high-side switch of the power stage. 25 VDD Internal supply pin. Used to power internal control circuitry. 26 PGND Ground for power circuitry. 27 VOUT Output Voltage pin, duplicate for multiple output distribution. 28 VIN Input Voltage pin, duplicate. 29 SW Switch pin, duplicate. 30 PHASE Phase pin, duplicate. 31 PGOOD Power Good pin, duplicate. 32 FB Feedback pin, duplicate. 33 LDOOUT LDO Output, duplicate. 34 VREG Internal Regulator pin, duplicate. 35 NC No Connect pin, duplicate. 36 PGND Power Ground, duplicate. 37 EN Enable pin, duplicate. 38 RT/CLK Clock input, duplicate. 39 VOSENSE Voltage Sense, duplicate. 40 AVIN Analog Voltage Input, duplicate.Circuit Principle and Working:
The TPS82140SILR is a buck converter, which steps down a higher input voltage (VIN) to a lower regulated output voltage (VOUT) with high efficiency. It operates using Pulse Width Modulation (PWM) to control the voltage conversion process, where the switching transistors (controlled by the driver pins) open and close rapidly to transfer energy through an inductor.
The feedback loop, involving pins like FB and VOSENSE, ensures that the output voltage is regulated precisely according to the load demand. The enable pin (EN) controls the overall operation of the converter, and the Power Good pin (PGOOD) signals the status of the output voltage.
20 Frequently Asked Questions (FAQ) for TPS82140SILR
What is the operating input voltage range for the TPS82140SILR? The operating input voltage range for the TPS82140SILR is 3.0V to 5.5V. What is the output voltage range of the TPS82140SILR? The output voltage can be set from 0.8V to 5V using external feedback resistors. How do I enable or disable the TPS82140SILR? The TPS82140SILR is enabled by pulling the EN pin high and disabled by pulling it low. What is the switching frequency of the TPS82140SILR? The switching frequency is typically set by the external resistor connected to the RT pin, with options ranging from 100 kHz to 3 MHz. Can I use the TPS82140SILR in low-power applications? Yes, the TPS82140SILR has an Eco-mode feature for low-power applications. What should I connect to the SW pin? The SW pin should be connected to the inductor, which is part of the power stage. What is the function of the PHASE pin? The PHASE pin is used to generate the necessary signals for controlling the switching transistors. What is the purpose of the FB pin? The FB pin is used for voltage feedback, ensuring the output voltage is correctly regulated. What type of capacitor should be used for the CBOOT pin? A ceramic capacitor of appropriate value (typically 0.1 µF) should be used for the CBOOT pin.How can I adjust the output voltage?
The output voltage can be adjusted by changing the resistor divider connected to the FB pin.What is the role of the PGOOD pin?
The PGOOD pin indicates when the output voltage is within a proper range, signaling the correct operation of the device.How can I set the switching frequency?
The switching frequency is set using a resistor connected to the RT pin, with different values corresponding to different frequencies.Can the TPS82140SILR be used for powering multiple devices?
Yes, the TPS82140SILR can be used to power multiple devices by paralleling the output pins.What is the function of the VOSENSE pin?
The VOSENSE pin monitors the output voltage for accurate regulation.Can I use the TPS82140SILR in a high-temperature environment?
The TPS82140SILR is rated for operation within a temperature range of -40°C to 125°C.What is the maximum current the TPS82140SILR can supply?
The device can supply up to 1.4A of output current.Is the TPS82140SILR compatible with digital systems?
Yes, the TPS82140SILR works well with digital systems requiring stable, regulated power.Can I use the TPS82140SILR in battery-powered applications?
Yes, the TPS82140SILR is ideal for battery-powered applications due to its efficiency and low power consumption.How do I handle transient voltage spikes?
Transient spikes can be managed with external capacitors and proper PCB layout design for power and ground planes.Is there any protection built into the TPS82140SILR?
Yes, the device has built-in overcurrent, overvoltage, and thermal protection to ensure safe operation.This explanation is designed to be clear and thorough, with a focus on detailed pin functions and common questions for a better understanding of the TPS82140SILR's features.