MAX1870A Step-Up/Step-Down Li+ Battery Charger

PublishTime：2021-06-15

●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 com-ponents. The MAX1870A uses a proprietary step-up/ step-down 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 lithium-ion (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.
●Benefits and Features
■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 0V 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

Brand of Product：	Maxim
Part#：	MAX1870A 、 MAX1870AEVKIT 、 MAX1870AETJ 、 MAX1870 、 MAX1870AETJ+ More Part#
Product Category：	Step-Up Li+ Battery Charger 、 Step-Down Li+ Battery Charger 、 evaluation kit 、 step-up multichemistry battery charger 、 /step-down multichemistry battery charger 、 step-up DC-DC controller 、 step-down DC-DC controller 、 H-Bridge Controller 、 battery charger More
Application：	[ Notebook ][ Subnotebook Computers ][ Handheld Terminals ] More
Data Type：	Datasheet More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：	QFN;TQFN
Language：	English Chinese Chinese and English Japanese
Date of Creation：	8/15
Version Number：	Rev 3
Data Encoding：	19-3243
Data Size：	1.6 MB

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