TPS25921LD

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TPS25921LD is a “slider switch” power sequencing hot swap controller with an integrated FET driver that enables high side/low side big MOSFET control. This device is suitable for applications with sensitive loads such as point-of-load (POL) converters, servers and telecom systems. It integrates several features to provide a reliable hot swapping solution for safe insertion and removal of card-based systems.

The key features of TPS25921LD include:

• Integrated 6-mΩ/90°C Power MOSFET drivers
• Power supply sequencing controlled by input/output voltage thresholds plus power good and delay timers
• Over-current protection (latching or non-latching)
• Independent adjustable power-good and power-fail reporters
• Latching current limit feature increases system diagnostic capability
• Highly integrated VPWR and fail sequencers with supply current monitor
• Internal or external 40-mΩ current limit set resistor
• Integrated push-pull OVLO and reverse-current protection

The TPS25921LD provides system designers with a cost-effective solution for applications requiring sequenced power-up and power-down. This power sequencing offers the ability to correctly power up and down sensitive loads, allowing tight control over supply current. The integrated power MOSFET drivers and adjustable power good/fail comparators enable soft power enable/disable and reliable power control during hot swap events. The current limit feature with latching capability also helps increase fault diagnostics.

The operating principle of TPS25921LD is quite simple. It is composed of two parts: the VPWR power sequencing and the power control. The VPWR power sequencing provides the required power sequencing delays and the power control ensures that the system supply is always above the power fail voltage level. The TPS25921LD senses the VPWR voltage, computes the power-on/off transition points, and then controls the load using the internal MOSFET driver. If the load exceeds the current limit, an OVLO interrupt will be generated, and the TPS25921LD will disable the MOSFET driver. The TPS25921LD also provides an adjustable power-good/fail threshold for further protection.

TPS25921LD is an ideal choice for applications requiring fast and safe power sequencing. Its high integration and adjustable power-good/fail threshold provide reliable power control and flexibility to system design. It has been successfully used in intelligent power, networking, and telecom systems. Its integrated current limit feature helps to provide fast fault diagnostics to ensure uninterrupted operation of the systems.

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