DS2731
Cache-Memory Battery-Backup Management IC
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Complete Cache-Memory Battery-Backup IC Reduces System Cost, Component Count, and Footprint Over Current Solutions
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Features
- Lithium Chemistry CCCV Charger
- Adjustable Regulated Charging Up to 1.5A DC
- Adjustable Charge Voltage from 3.8V to 4.6V
- External and Internal Thermal Protection
- Safety Timer Secondary Termination
- LED Indicator Outputs
- Detects Power Outage and Switches Between Normal Power and Backup Battery
- Adjustable High-Efficiency Synchronous Buck Regulator with Skip Mode at Light Loads
- Low-Power Consumption in Discharge Mode
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The DS2731 is a complete power-management solution for modular backup applications. It is well-suited for 2.5V and below memory bus voltages, with an input voltage of 12V. The DS2731 includes an internal MOSFET switching power stage for charging a one-cell lithium chemistry battery. It has a fully integrated synchronous buck regulator capable of supplying up to 450mA of cache backup supply current, and the necessary logic and power devices for handling the switchover from system power to battery power. The battery charging method of the DS2731 is constant current/constant voltage (CCCV). Output voltage can be margined from 3.8V to 4.6V using a resistor-divider. Charge is terminated when the charging current falls below 5% of full charge current. Switchover to battery backup is initiated by an internal comparator and occurs automatically when a sensed-input voltage drops below 2.93V. At light loads, the 2MHz internal synchronous buck regulator operates in burst mode for maximum efficiency. All nonessential functions of the DS2731 are disabled while supplying holdup current to the cache memory, and the IC goes into very low-current dormant mode when the battery voltage drops below a user-settable threshold. The DS2731 keeps track of charge status and signals the user through open-drain I/O pins that can be used to drive LEDs.
Applications
- RAID Server Memory Card
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DS2731
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Software & Part Ecosystem
Evaluation Kits 1
DS2731EVKIT
Evaluation Kit for the DS2731
Product Detail
The DS2731 evaluation kit (EV kit) demonstrates all the features of the DS2731 battery-backup power-management IC. The EV kit includes an assembled and tested PCB for easy connection to power sources and a load. Three power sources—a 3.3V auxiliary supply, a 12V supply, and a single lithium-ion (Li+) battery—connect to the DS2731 EV kit to supply the high-efficiency, synchronous buck regulator and battery charger. The IC automatically selects the best-qualified power source for the buck regulator. Thresholds for low-battery voltage, charge regulation voltage and current, charge safety timer, and buck-output voltage are set by resistors.
Applications
- RAID Server Memory Card