DS2731
NOT RECOMMENDED FOR NEW DESIGNSCache-Memory Battery-Backup Management IC
Complete Cache-Memory Battery-Backup IC Reduces System Cost, Component Count, and Footprint Over Current Solutions
- Part Models
- 2
- 1ku List Price
- price unavailable
Overview
- 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
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
Documentation
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| DS2731E+ | TSSOP_4.4 / TSSOP_6.1 | ||
| DS2731E+T&R | TSSOP_4.4 / TSSOP_6.1 |
This is the most up-to-date revision of the Data Sheet.
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