Power Management Hot Swap Controllers ADM1276-3ACPZ Monitor 1 Channel General Purpose 20-LFCSP-WQ

Power Management Hot Swap Controllers ADM1276-3ACPZ Monitor 1 Channel General Purpose 20-LFCSP-WQ

PRODUCT DESCRIPTION

The ADM1276 is a hot swap controller that allows a circuit board to be removed from or inserted into a live backplane. It also features current and voltage readback via an integrated 12-bit analog-todigital converter (ADC), accessed using a PMBus™ interface. The load current is measured using an internal current sense amplifier that measures the voltage across a sense resistor in the power path via the SENSE+ and SENSE− pins. A default limit of 20 mV is set, but this limit can be adjusted, if required, using a resistor divider network from the internal reference voltage to the ISET pin.

The ADM1276 limits the current through the sense resistor by controlling the gate voltage of an external N-channel FET in the power path, via the GATE pin. The sense voltage—and, therefore, the load current—is maintained below the preset maximum.

The ADM1276 protects the external FET by limiting the time that the FET remains on while the current is at its maximum value. This current-limit time is set by the choice of capacitor connected to the TIMER pin. In addition, a foldback resistor network can be used to actively lower the current limit as the voltage across the FET is increased.

This helps to maintain constant power in the FET and allows the safe operating area (SOA) to be adhered to in an effective manner. In case of a short-circuit event, a fast internal overcurrent detector responds within 370 ns and signals the gate to shut down. A 1500 mA pull-down device ensures a fast FET response. The ADM1276 features overvoltage (OV) and undervoltage (UV) protection, programmed using external resistor dividers on the UV and OV pins.

A PWRGD signal can be used to detect when the output supply is valid, using the FLB pin to monitor the output. A GPO pin can be configured as an output signal that can be asserted when a programmed current or voltage level is reached. The 12-bit ADC can measure the current in the sense resistor, as well as the supply voltage on the SENSE+ pin or the output voltage. A PMBus interface allows a controller to read current and voltage data from the ADC.

Measurements can be initiated by a PMBus command. Alternatively, the ADC can run continuously, and the user can read the latest conversion data whenever required. As many as four unique PMBus addresses can be selected, depending on the way that the ADR pin is connected. The ADM1276 is available in a 20-lead LFCSP with a LATCH pin that can be configured for automatic retry or latch-off when an overcurrent fault occurs.

PRODUCT PROPERTIES

STJK(HK) ELECTRONICS CO.,LIMITED is an professional Electronic Components distributor,more than 12 years wholesale and distributor enable us accumulated much experience in electronic components field;We sufficient stock of hard to find and obsolete electronic components, semiconductors, military components, switches, relays,sensors,circuit protection and hard drives. The first-level agent of many electronic components brand and original factories, complete categories, stable supply,Lowest price,all chips can be traced back to the origin.

STJK(HK) has always been customer-driven and quality focused. Continuous improvement and ongoing statistical analysis of processes have always been integral to our approach to business. Our Goal: quality first, reputation first, service first, customers first. Be your reliable supplier in China is our pursue.

As an Independent Distributor,STJK(HK) ELECTRONICS CO.,LIMITED is not affiliated with the manufacturers of the products it sells except as expressly noted otherwise.Any and all trademark rights associated with the manufacturers' names and products are owned by the respective manufacturers.