TI LM25066PSQX/NOPB

LM25066 combines a high-performance hot-swap controller with a PMBus-compatible SMBus/I²C interface, enabling precise measurement, protection, and control of electrical operating conditions for computing and storage blades connected to backplane power buses. Via the SMBus interface, LM25066 continuously provides the system management host with real-time power, voltage, current, temperature, and fault data.

The LM25066 control module incorporates a unique hot-swap architecture that provides current and power limiting to protect sensitive circuits when a board is inserted into a live system backplane or any other "hot" power source. The device also features a fast-response circuit breaker that protects it from damage during output short-circuit conditions. Input undervoltage and overvoltage levels, hysteresis voltage, insertion delay time, and fault detection time are all configurable. The temperature monitoring module on the LM25066 connects to a low-cost external diode to monitor the temperature of an external MOSFET or other temperature-sensitive components. The Power Good output provides immediate indication when the input and/or output voltage exceeds the configured range. LM25066 achieves ±2.4% current measurement accuracy across the full temperature range.

The LM25066 monitoring module computes instantaneous and average values of subsystem operating parameters (VIN, IIN, PIN, and VOUT) as well as peak power. Accurate power averaging is achieved by calculating the mean of the product of input voltage and current. The black box (telemetry/fault capture) function captures and stores telemetry data and device status upon the occurrence of a warning or fault.

• Input voltage range: 2.9V to 17V
• I2C/SMBus interface and PMBus command structure compatible
• 25mV or 46mV programmable current-limit threshold
• Configurable circuit breaker protection for hard short-circuit faults
• Configurable UVLO and OVLO with hysteresis voltage
• Remote temperature sensing with programmable warning and shutdown thresholds
• MOSFET damage detection and notification
• Real-time monitoring of VIN, VOUT, IIN, PIN, and VAUX (12-bit resolution, 1kHz sampling rate)
• Current measurement accuracy: 2.4% over full temperature range
• Power measurement accuracy: 3% over full temperature range
• True input power measurement using simultaneous sampling of VIN and IIN, with accurate averaging of dynamic power readings
• Averaging of VIN, IIN, PIN, and VOUT (programmable time interval from 0.001 to 4 seconds)
• Programmable warning and fault thresholds with notification via SMBA pin
• Black-box capture of telemetry data and device status, triggered by warning or fault conditions
• Full-featured application design and development GUI
• 24-pin WQFN package

• Server backplane systems
• Base station power distribution systems
• Solid-state circuit breakers