Overview
The TPS62912RPUR from Texas Instruments is a high-efficiency, low-noise, and low-ripple synchronous buck converter. This device is part of the TPS6291x family, designed for noise-sensitive applications such as high-speed analog-to-digital converters (ADCs), radar, and medical devices. It operates with a fixed switching frequency of either 2.2 MHz or 1 MHz and can be synchronized to an external clock. The converter features a filtered internal reference to achieve low-noise output similar to low-noise linear dropout regulators (LDOs).
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3 V to 17 V | V |
| Output Current | 0 to 2 A | A |
| Switching Frequency | 1 MHz or 2.2 MHz | Hz |
| Output Voltage Ripple | < 10 µVRMS | V |
| Output Noise | < 20 µVRMS | V |
| Package Type | QFN (10-pin) | |
| Body Size | 2.0 mm × 2.0 mm | mm |
| Junction Temperature Range | -40°C to 150°C | °C |
| High-Side FET On-Resistance | 57 mΩ to 95 mΩ | mΩ |
| Low-Side FET On-Resistance | 20 mΩ to 39 mΩ | mΩ |
Key Features
- High-efficiency synchronous buck converter with low noise and low ripple.
- Fixed switching frequency of 1 MHz or 2.2 MHz, with optional synchronization to an external clock.
- Filtered internal reference for low-noise output similar to low-noise LDOs.
- Optional second-stage ferrite bead L-C filter to reduce output voltage ripple below 10 µVRMS.
- Spread spectrum modulation to reduce mixing spurs, particularly beneficial for ADC and radar applications.
- Integrated loop compensation for stability with external filter inductors up to 50 nH.
- Power-good output with adjustable threshold and delay.
- Soft-start and enable/disable functionality with internal pulldown resistor.
Applications
- Noise-sensitive applications such as high-speed analog-to-digital converters (ADCs).
- Radar and avionics systems.
- Medical devices requiring low noise and high efficiency.
- Telecom infrastructure.
- Test and measurement equipment.
- Aerospace and defense applications.
Q & A
- What is the input voltage range of the TPS62912RPUR?
The input voltage range is from 3 V to 17 V.
- What are the available switching frequencies for the TPS62912RPUR?
The device operates at fixed switching frequencies of either 1 MHz or 2.2 MHz.
- How can the output voltage ripple be reduced in the TPS62912RPUR?
The output voltage ripple can be further reduced by adding a small second-stage L-C filter, such as a ferrite bead or a small inductor, followed by an output capacitor.
- What is the purpose of the spread spectrum modulation in the TPS62912RPUR?
The spread spectrum modulation reduces the mixing spurs, which is particularly beneficial for applications involving ADCs and radar.
- What is the maximum output current of the TPS62912RPUR?
The maximum output current is 2 A.
- What package type and size does the TPS62912RPUR come in?
The device comes in a 10-pin QFN package with a body size of 2.0 mm × 2.0 mm.
- What are the typical applications of the TPS62912RPUR?
Typical applications include high-speed ADCs, radar, medical devices, telecom infrastructure, test and measurement, and aerospace and defense.
- How does the TPS62912RPUR achieve low-noise output?
The device achieves low-noise output through a filtered internal reference similar to low-noise LDOs.
- What is the junction temperature range of the TPS62912RPUR?
The junction temperature range is from -40°C to 150°C.
- Does the TPS62912RPUR have power-good output functionality?
Yes, the device has a power-good output with adjustable threshold and delay.
