Overview
The TPS40425RHAT is a PMBus, synchronous buck, driverless controller produced by Texas Instruments. It operates in non-smart power mode in its factory default setting but can be configured to operate in smart power mode after PMBus programming and a power reboot. This controller is designed for high-current applications, supporting up to 120 A load current when stacked up to four phases. It features a wide input voltage range of 4.5 V to 20 V and output voltages from 0.6 V, making it suitable for various power supply needs, including 5-V and 12-V intermediate supply buses.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 40-Pin VQFN (6 mm × 6 mm) |
| Operating Temperature Range | -40°C to 125°C |
| Input Voltage Range | 4.5 V to 20 V |
| Output Voltage Range | 0.6 V to VIN |
| Output Current Capability | Up to 120 A (stackable up to 4 phases) |
| Switching Frequency | Programmable from 200 kHz to 1.5 MHz |
| Accuracy of Reference Voltage | ±0.5% from -40°C to 125°C |
| PMBus Interface | Capable of programming various parameters |
| Fault Protection | OC/OV/UV/OT fault protection |
| Non-Volatile Memory | On-chip NVM to store custom configurations |
Key Features
- Non-smart power mode in factory default setting, with the option to switch to smart power mode via PMBus programming
- Pin-for-pin equivalent to TPS40428 – smart power mode in factory default
- Dual or multi-phase synchronous buck controller
- Individual high-speed AVS interface (0.5-V to 1.5-V range)
- Fast transient response and accurate current sharing
- Stackable up to four phases for high current applications
- 2-, 3-, or 4-phase interleaved phase shifts to reduce input and output ripples
- PMBus interface capability for programming various parameters
- Margining up or down with 2-mV step
- Programmable fault limit and response
- ±0.8% VOUT accuracy and current monitoring
- ±4.5°C external temperature monitoring with x3904
- Programmable UVLO ON/OFF thresholds, soft-start time, turn-on delay, and turn-off delay
- On-chip non-volatile memory (NVM) to store custom configurations
- 0.6-V reference voltage with 0.5% accuracy from -40°C to 125°C
- Inductor DCR current sensing and programmable switching frequency
- Supports pre-biased output, differential remote sensing, and synchronization to an external clock
Applications
The TPS40425RHAT is suitable for a variety of high-power applications, including:
- Wireless infrastructure
- Switcher/router networking
- Server and storage systems
- High-current power supplies for modern ASICs and other high-power devices
Q & A
- What is the operating temperature range of the TPS40425RHAT?
The operating temperature range is -40°C to 125°C. - What is the input voltage range of the TPS40425RHAT?
The input voltage range is 4.5 V to 20 V. - Can the TPS40425RHAT be stacked for higher current applications?
Yes, it can be stacked up to four phases to support load currents as high as 120 A. - What is the accuracy of the reference voltage?
The reference voltage has an accuracy of ±0.5% from -40°C to 125°C. - Does the TPS40425RHAT support PMBus interface?
Yes, it supports PMBus interface for programming various parameters. - What types of fault protection does the TPS40425RHAT offer?
The device offers OC/OV/UV/OT fault protection. - Can the switching frequency be programmed?
Yes, the switching frequency can be programmed from 200 kHz to 1.5 MHz. - Does the TPS40425RHAT support pre-biased output?
Yes, it supports pre-biased output. - What is the purpose of the on-chip non-volatile memory (NVM)?
The on-chip NVM is used to store custom configurations. - What are some common applications of the TPS40425RHAT?
Common applications include wireless infrastructure, switcher/router networking, server and storage systems, and high-current power supplies for modern ASICs.
