Features and Benefits
- Highly Flexible Input Voltage Range Works with Affordable AC Adapters
- Step-Up/Step-Down Control Scheme
- Input Voltage from 8V to 28V
- Analog Output Indicates Adapter Current
- Accurately Charge Li+ or NiCd/NiMH Batteries
- Battery Voltage from 0 to 17.6V
- ±0.5% Charge-Voltage Accuracy
- ±9% Charge-Current Accuracy
- ±8% Input Current-Limit Accuracy
- Tune Design to Increase Safety and Efficiency
- Programmable Maximum Battery Charge Current
- Analog Inputs Control Charge Current, Charge Voltage, and Input Current Limit
- 32-Pin Thin QFN (5mm x 5mm) Package Saves Space While Supporting Step-Up and Step-Down Operation
The MAX1870A step-up/step-down multichemistry battery charger charges with battery voltages above and below the adapter voltage. This highly integrated charger requires a minimum number of external components. The MAX1870A uses a proprietary step-up/stepdown control scheme that provides efficient charging. Analog inputs control charge current and voltage, and can be programmed by the host or hardwired.
The MAX1870A accurately charges two to four lithiumion (Li+) series cells at greater than 4A. A programmable input current limit is included, which avoids overloading the AC adapter when supplying the load and the battery charger simultaneously. This reduces the maximum adapter current, which reduces cost. The MAX1870A provides analog outputs to monitor the current drawn from the AC adapter and charge current. A digital output indicates the presence of an AC adapter. When the adapter is removed, the MAX1870A consumes less than 1µA from the battery.
The MAX1870A is available in a 32-pin thin QFN (5mm x 5mm) package and is specified over the -40°C to +85°C extended temperature range. The MAX1870A evaluation kit (MAX1870AEVKIT) is available to help reduce design time.
- Handheld Terminals
- Notebook and Subnotebook Computers
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX1870A Reliability Data1/12/2023
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 Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|MAX1870AETJ+||Material Declaration||Reliability Data||32-LFCSP-5X5X0.75|
|MAX1870AETJ+T||Material Declaration||Reliability Data||32-LFCSP-5X5X0.75|
|Wafer Fabrication Data||MAX1870A Reliability Data|
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