AD7280A
NOT RECOMMENDED FOR NEW DESIGNSLithium Ion Battery Monitoring System
- Part Models
- 4
- 1ku List Price
- Starting From $7.03
Overview
- 12-bit ADC, 1 μs per channel conversion time
- 6 analog input channels,
- CM range 0.5 V to 27.5 V
- 6 auxiliary ADC Inputs
- ±1.6 mV cell voltage accuracy
- On-chip voltage regulator
- Cell balancing interface
- Daisy-chain interface
- Internal reference: ±3 ppm/°C
- 1.8 μA power-down current
- High input impedance
- Serial interface with alert function
- See data sheet for additional features
The AD7280A contains all the functions required for general-purpose monitoring of stacked lithium ion batteries as used in hybrid electric vehicles, battery backup applications, and power tools. The part has multiplexed cell voltage and auxiliary ADC measurement channels for up to six cells of battery management. An internal ±3 ppm reference is provided that allows a cell voltage accuracy of ±1.6 mV. The ADC resolution is 12 bits and allows conversion of up to 48 cells within 7 μs.
The AD7280A operates from just one VDD supply that has a range of 8 V to 30 V (with an absolute maximum rating of 33 V). The part provides six differential analog input channels to accommodate large common-mode signals across the full VDD range. Each channel allows an input signal range, VIN(+) − VIN(−), of 1 V to 5 V. The input pins assume a series stack of six cells. In addition, the part includes six auxiliary ADC input channels that can be used for temperature measurement or system diagnostics.
The AD7280A includes on-chip registers that allow a sequence of channel measurements to be programmed to suit the applications requirements.
The AD7280A also includes a dynamic alert function that can detect if the cell voltages or auxiliary ADC inputs exceed an upper or lower limit defined by the user. The AD7280A has cell balancing interface outputs designed to control external FET transistors to allow discharging of individual cells.
The AD7280A includes a built in self-test feature that internally applies a known voltage to the ADC inputs.
There is a daisy-chain interface that allows up to eight parts to be stacked without the need for individual device isolation.
The AD7280A requires only one supply pin that takes 6.5 mA under normal operation, while converting at 1 MSPS.
All this functionality is provided in a 48-lead LQFP package operating over a temperature range of −40°C to +105°C.
APPLICATIONS
- Lithium ion battery monitoring
- Electric and hybrid electric vehicles
- Power supply back up
- Power tools
Documentation
Data Sheet 1
User Guide 1
Circuit Note 1
Device Drivers 2
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 |
|---|---|---|---|
| AD7280ABSTZ | 48-Lead LQFP (7mm x 7mm) | ||
| AD7280ABSTZ-RL | 48-Lead LQFP (7mm x 7mm) | ||
| AD7280AWBSTZ | 48-Lead LQFP (7mm x 7mm) | ||
| AD7280AWBSTZ-RL | 48-Lead LQFP (7mm x 7mm) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 26, 2024 - 23_0082 Qualification of Alternate Wafer Fab Site at ADI Limerick for Select ADC Products |
||
| AD7280ABSTZ | PRODUCTION | |
| AD7280ABSTZ-RL | PRODUCTION | |
| AD7280AWBSTZ | PRODUCTION | |
| AD7280AWBSTZ-RL | PRODUCTION | |
|
Jul 30, 2013 - 13_0173 AD7280/AD7280A Minor Mask Modification |
||
| AD7280ABSTZ | PRODUCTION | |
| AD7280ABSTZ-RL | PRODUCTION | |
| AD7280AWBSTZ | PRODUCTION | |
| AD7280AWBSTZ-RL | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 2
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Battery Monitors & Fuel Gauges 1 | ||
| AD8280 | NOT RECOMMENDED FOR NEW DESIGNS | Lithium Ion Battery Safety Monitor |
| Current Sense Amplifiers 3 | ||
| AD8217 | PRODUCTION | High Resolution, Zero-Drift Current Shunt Monitor |
| AD8218 | PRODUCTION | Zero Drift, Bi-Directional Current Shunt Monitor |
| AD8219 | PRODUCTION | Zero Drift, Unidirectional Current Shunt Monitor |
| Data Isolators 1 | ||
| ADUM1201 | PRODUCTION | Dual-Channel Digital Isolator (1/1 Channel Directionality) |
| Interface Transceivers 1 | ||
| ADUM5401 | PRODUCTION | Quad-Channel, 2.5 kV Isolators with Integrated DC-to-DC Converter (3/1 channel directionality) |
Evaluation Kits
AD7280A Evaluation Board
