The "TPS62175DQCR" is a Power management IC from Texas Instruments (TI). This device is part of their TPS6217x series of step-down (buck) converters, designed for providing efficient voltage conversion with a variety of output voltages, typically used in applications like portable devices, consumer electronics, and similar applications requiring efficient power supply.
Package Type and Pin Count:
The TPS62175DQCR comes in a QFN-16 package with 16 pins. This is a quad flat no-lead package with a small footprint.
Pin Function Specifications and Detailed Circuit Principle:
Below is a comprehensive breakdown of the pinout function for the TPS62175DQCR. As it is a 16-pin package, I will outline all the 16 pins in detail.
Pin Pin Name Pin Function Description 1 PGND Power Ground. Connect to the power ground plane to complete the power return path. 2 SW Switch Node. This pin is connected to the inductor and is used in the internal switching node to regulate output voltage. 3 FB Feedback. This pin senses the output voltage and provides feedback to the internal control loop to regulate the output voltage. 4 VOUT Output Voltage. This is the regulated output voltage pin that provides the power to the load. 5 IN Input Voltage. This is the power input to the converter, typically 3.0V to 5.5V for proper operation. 6 VIN Input Voltage. This pin provides the power to the device, and it connects to the positive voltage rail. 7 SS/TRK Soft-Start/Tracking. This pin is used for controlling the soft-start feature, or it can be used for voltage tracking. 8 ON/OFF Enable/Shutdown Pin. When low, the device shuts down; when high, the device operates normally. 9 NC No Connection. This pin is not internally connected and can be left floating. 10 PG Power Good Output. This is an open-drain output that indicates whether the output voltage is within regulation. 11 BOOT Bootstrap. This pin provides the bootstrap voltage needed for the internal high-side MOSFET gate driver. 12 LDRV Low-Side Driver. This pin connects to the gate of the low-side MOSFET for regulating the current flow. 13 HDRV High-Side Driver. This pin connects to the gate of the high-side MOSFET for controlling the switch. 14 COMP Compensation. This pin is used to connect the external compensation network for stabilizing the control loop. 15 NC No Connection. Similar to Pin 9, this is a non-functional pin. 16 AGND Analog Ground. This pin provides the reference ground for the internal analog circuitry and should be tied to the system ground.Circuit Principle:
The TPS62175 is a buck converter that steps down an input voltage to a lower, regulated output voltage. It operates with a high-efficiency switching regulator architecture, using a combination of high-side and low-side MOSFETs controlled by an internal PWM controller. The main function of the IC is to maintain a stable output voltage by adjusting the duty cycle of the switching MOSFETs. The feedback loop (via the FB pin) monitors the output voltage, ensuring it remains at the desired level.
When the output voltage is low, the internal control loop adjusts the switching duty cycle to increase the output voltage. The SW pin handles the switching node connected to the inductor, which helps in transferring energy to the load. The PG pin gives an indication of whether the output voltage is within regulation.
FAQ: Commonly Asked Questions
What is the input voltage range for the TPS62175DQCR? The input voltage range for the TPS62175DQCR is between 3.0V and 5.5V.
What is the output voltage range for the TPS62175DQCR? The output voltage can be adjusted within a range from 0.8V to 3.6V, depending on the external feedback network.
What is the purpose of the PG pin? The PG pin is used to indicate whether the output voltage is within the regulation range. It is an open-drain output.
What is the function of the SW pin? The SW pin is connected to the switch node, where the inductor and internal switching elements are located, for the voltage conversion.
What is the maximum output current the TPS62175DQCR can supply? The device can supply up to 3A of continuous output current.
Can the TPS62175DQCR operate with a 3.3V input voltage? Yes, it can operate with an input voltage of 3.3V, as it falls within the operating range (3.0V to 5.5V).
How does the soft-start feature work? The SS/TRK pin controls the soft-start process, which limits the inrush current at power-up by gradually ramping the output voltage.
What is the role of the COMP pin? The COMP pin is used for external compensation of the control loop to stabilize the regulator and optimize performance.
What type of inductor should be used with the TPS62175DQCR? A ceramic inductor with a typical value in the range of 2.2µH to 10µH is recommended for best performance.
What is the maximum operating temperature of the TPS62175DQCR? The maximum operating temperature for this IC is 125°C.
How do I enable or disable the TPS62175DQCR? The ON/OFF pin controls the enable/disable functionality. Drive it high to enable, low to disable.
Can the TPS62175DQCR be used in parallel with other converters? It is not recommended to use multiple TPS62175DQCR devices in parallel due to synchronization limitations.
What happens if the input voltage goes below the specified range? If the input voltage falls below 3.0V, the device will stop regulating and may enter a low-power state or shut down.
What type of capacitor s should be used with the TPS62175DQCR? Input and output capacitors of the ceramic type with low ESR are recommended, typically 10µF or higher.
What is the power consumption of the TPS62175DQCR in idle mode? The quiescent current in idle mode is typically around 30µA.
Can the TPS62175DQCR be used in automotive applications? Yes, the TPS62175DQCR is suitable for use in automotive applications that require low-voltage, high-efficiency power conversion.
Does the TPS62175DQCR include overcurrent protection? Yes, it has overcurrent protection and will limit the output current if it exceeds the rated value.
What is the typical efficiency of the TPS62175DQCR? The efficiency typically ranges from 85% to 95%, depending on the input-output voltage difference and load conditions.
Can the TPS62175DQCR be used for 5V systems? Yes, the TPS62175DQCR can be used in 5V systems as long as the output voltage is properly adjusted within the range.
What happens if the feedback pin (FB) is not connected? If the FB pin is left floating or improperly connected, the device will not regulate the output voltage properly, leading to incorrect or unstable output.
These detailed specifications should give you a comprehensive understanding of the TPS62175DQCR's pinout and operation.