Reference Design For Energy Sequencing With Load Switches

Utilizing built-in load switches simplifies the design and ensures secure and dependable energy sequencing whereas sustaining a compact footprint in comparison with conventional discrete MOSFET implementations.

In lots of digital programs, the correct operation of subsystems and downstream elements depends upon managed power-up and power-down sequences. Energy sequencing is important in functions the place timing constraints are essential, because it ensures that every ingredient receives energy within the right order, avoiding potential harm or malfunction. This design is exceptionally versatile, providing the flexibility to customize timing configurations by adjusting the board’s jumpers, resistors, and capacitors. This flexibility makes it adaptable to numerous functions, from multi-function printers (MFPs) to set-top bins (STBs), the place exact timing sequences are required for optimum operation. 

This reference design, TIDA-01584 by Texas Devices (TI), demonstrates a number of energy sequencing configurations utilizing load switches, permitting unbiased timing adjustment for every voltage rail. By leveraging these load switches, every voltage rail might be managed with out requiring in depth processor involvement or the necessity for exterior digital elements. The design consists of three totally different energy sequencing configurations: CT Configuration, QOD Configuration, and Impartial GPIO Configuration. Every configuration permits for adjustable timing thresholds utilizing CT and QOD pins, offering flexibility in assembly particular system necessities. 

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It has pin-to-pin footprint compatibility, permitting simple swapping between load switches to accommodate voltage, present, and Ron necessities. This modularity ensures that the design might be tailor-made to fulfill the distinctive wants of different functions, lowering the general answer dimension and part depend in comparison with discrete MOSFET options. The reference design incorporates a number of load switches with distinct traits suited to totally different energy necessities. The TPS22918 is a 5.5-V, 2-A load swap housed in a 6-pin SOT-23 bundle. It contains a low-resistance N-channel MOSFET, which minimizes voltage drop, making it preferrred for low-voltage, high-current rails. The TPS22975 is a single-channel, 6-A load swap in an 8-pin SON bundle. This system additionally makes use of an N-channel MOSFET and gives a configurable slew charge for functions requiring particular rise instances. Lastly, the TPS22917, one other 5.5-V, 2-A load swap in a 6-pin SOT-23 bundle, employs a low-resistance P-channel MOSFET to scale back dropout voltage. 

This design is well-suited for varied functions that demand exact energy sequencing, together with Multi-Perform Printers (MFPs), Set-Prime Bins (STBs), Distant Radio Items, and BaseBand Items. This design gives a strong answer for guaranteeing secure and environment friendly energy administration throughout varied digital gadgets by providing flexibility, compact dimension, and dependable efficiency. Texas Devices (TI)has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has extra knowledge in regards to the reference design. To learn extra about this reference design, click on right here.