Blog về công ty Recycle TI Sequencers:Analog Power-Supply Sequencer,Digital Power-Supply Sequencer

Recycle TI Sequencers:Analog Power-Supply Sequencer,Digital Power-Supply Sequencer

Shenzhen Mingjiada Electronics Co., Ltd. is a globally renowned electronic component recycling company that has long specialised in the recycling of various high-value electronic components. Through our professional recycling channels, we assist clients in optimising their inventory and recovering capital.

Recyclable products include: 5G chips, new energy ICs, IoT ICs, Bluetooth ICs, in-vehicle infotainment system ICs, automotive-grade ICs, communications ICs, artificial intelligence chips, memory ICs, sensor ICs, microcontroller ICs, transceiver ICs, Ethernet ICs, Wi-Fi chips, wireless communication modules, connectors and related products.

Recycling Process

Inventory Classification: Clients need only provide basic information such as model number, brand, date of manufacture and quantity to complete the inventory classification.

Submit Inventory List: Send the inventory list to our valuation team via email or fax.

Professional Quotation: Our valuation team will provide a competitive quotation within 24 hours of receiving the list.

Transaction and Delivery: Once an agreement has been reached, both parties will mutually agree on the delivery method; we provide global logistics support.

I. The Core Function of Power Sequencers

In complex systems, there are strict, mandatory requirements regarding the power-up sequence, power-up delay and power-down sequence for different power rails. For example, in FPGAs, the auxiliary I/O power supply must typically be powered up first, followed by the core power supply; the power-down sequence is exactly the reverse. The core value of TI’s power sequencer lies primarily in three aspects: firstly, it prevents hardware damage caused by power sequencing errors, thereby enhancing system reliability; secondly, it standardises the start-up and shut-down logic for multiple power supplies, suppressing inrush current and reducing system interference; thirdly, it enables power supply fault monitoring and protection, rapidly shutting down the power supply in the event of an anomaly to ensure the safe and stable operation of the equipment.

II. TI Analogue Power Sequencer

2.1 Operating Principle

The TI analogue power sequencer employs a purely hardware-based analogue architecture, containing no software or digital logic units. It utilises internal comparators, reference voltage sources, delay circuits and MOS driver circuits to establish a hardware timing control loop. Its core control logic is based on voltage-threshold-triggered sequencing: once the voltage of the preceding power supply rises to a preset reference threshold, the hardware circuit automatically triggers a delay; upon completion of the delay, the output of the next power supply is enabled. The entire sequencing process relies on the hardware characteristics of the analogue circuitry, requiring no software configuration or host-computer debugging. Some high-end analogue sequencers support fine-tuning of the threshold voltage via external resistors, allowing precise adjustment of the trigger reference in 50 mV increments to accommodate the power-up detection requirements of different power rails.

2.2 Key Features

- Purely hardware-based operation with ultra-fast response: With no digital decoding or programme execution delays, power-up sequencing is rapid. Timing accuracy is fixed by the hardware circuitry, ensuring extremely high stability and strong resistance to electromagnetic interference.

- Simple configuration, plug-and-play: Available in versions with factory-preset fixed timing and versions allowing simple user fine-tuning; no programming or GUI software is required; operates with only a few external resistors and capacitors, resulting in a short development cycle.

- Streamlined functionality with targeted capabilities: The core implements only power-up and power-down sequencing control; some models integrate simple power-good (PG) detection and basic overvoltage/undervoltage protection, without complex data monitoring or fault logging functions.

- Low power consumption and high reliability: Featuring a simple architecture with few components, it has extremely low static power consumption and eliminates the risk of software crashes or runaway programmes, making it suitable for industrial applications requiring long-term, stable operation.

2.3 Typical TI Product Series

TI’s flagship analogue power sequencer is the LM388x series, a general-purpose industrial analogue timing control chip that supports timing control for multiple power rails. It encompasses both fixed-timing and simple programmable versions, meeting the basic timing control requirements for small to medium-scale multi-power-rail systems, and is widely used in consumer electronics, general industrial control and embedded devices. These chips utilise an internal dual comparator to establish a feedback loop, ensuring that the timing sequence for subsequent power rails is only initiated once the preceding power rail has stabilised to the required level, thereby effectively preventing erroneous triggering during the power-up phase.

2.4 Advantages, Disadvantages and Suitable Applications

Advantages: Low cost, simple circuitry, high reliability, strong immunity to interference, no software development required, and convenient mass-production debugging; Disadvantages: Poor timing flexibility; fixed delays and sequences; limited scope for fine-tuning; does not support complex timing logic or refined power supply monitoring.

Suitable applications: Mid-to-low-end embedded devices, industrial sensors, standard power modules and consumer electronics with a small number of power rails (up to 8), fixed timing logic and no need for post-production debugging or modification.

III. TI Digital Power Sequencer

3.1 Operating Principle

TI’s digital power sequencer is based on an architecture comprising a digital processor, ADC sampling and the PMBus digital bus, and is classified as an intelligent power management chip. Its operating logic is as follows: the ADC samples the voltage and current status of each power rail in real time, converting analogue signals into digital signals; then, utilising built-in firmware, it executes customised sequencing algorithms to precisely control the power-up sequence, delay durations and power-down logic for each power rail. It supports visual configuration of sequencing parameters, protection thresholds and monitoring logic via TI’s proprietary Fusion Digital Power™ GUI desktop software; parameters can be saved, modified and iterated in real time to adapt to complex and variable system requirements. It also supports multi-chip cascading for expansion, enabling unified sequencing control of extremely large-scale power rails.

3.2 Key Features

- Highly programmable timing with exceptional flexibility: Power-up sequence, delays for each rail, power-up ramp rates and power-down logic are all customisable. Supports segmented timing, fine-tuning of delays and timing jumps, enabling compliance with stringent and complex power sequencing specifications for FPGAs, high-end DSPs and servers.

- Comprehensive power monitoring and protection: Integrates high-precision voltage, current and temperature monitoring functions; supports fault detection for overvoltage, undervoltage, overcurrent, overheating and power-up timeout; enables real-time reporting of fault information and locking of fault states; and features protection logic such as fault latching, automatic restart and hierarchical shutdown.

- Digital communication and O&M: Comes standard with a PMBus communication interface, supporting remote monitoring, parameter configuration, data retrieval and fault log queries, meeting the remote operation and maintenance requirements of intelligent industrial control systems, servers and communications equipment.

- Exceptional scalability: A single chip can support the management of multiple power rails, whilst cascading multiple chips can scale up to the timing control of hundreds of power rails, meeting the demands of large and complex power supply systems. Taking the UCD91320 as an example, a single chip can manage 32 power rails, whilst a cascade of four chips supports up to 128 power rails for timing control.

3.3 Typical TI Product Series

TI’s digital power sequencer portfolio is centred on the UCD90x series and high-end models such as the UCD91320, which form part of the Fusion Digital Power™ digital power management solution. Among these, the UCD90120 and UCD90240 are general-purpose multi-rail digital sequencers, suitable for mid- to high-end embedded and industrial control applications; the UCD91320 is a high-end, high-capacity model that supports the management of 32 power rails and features PWM margin adjustment and active voltage fine-tuning, making it widely used in servers, data centres, high-end telecommunications equipment and high-precision industrial equipment.

3.4 Advantages, Disadvantages and Suitable Applications

Advantages: Flexible and configurable timing, comprehensive monitoring functions, robust protection mechanisms, support for remote operation and maintenance, and exceptional scalability, making them suitable for a wide range of complex and demanding power supply systems; Disadvantages: Higher cost, the need for host computer software to configure parameters, longer development and debugging cycles, and relatively complex circuit design.

Suitable scenarios: High-end equipment with a large number of power rails, complex timing logic, requiring precise power monitoring, and where parameter iteration is required at a later stage, including servers, data centres, high-end FPGA control units, core industrial automation equipment, and 5G communication base station power systems.