MAX1870A

PRODUCTION

Step-Up/Step-Down Li+ Battery Charger

Step-Up/Step-Down Multichemistry Battery Charger Charges with Battery Voltages Above and Below the Adapter Voltage

Data Sheet (Rev. 3) Product Selection Table

Part Models: 2
1ku List Price: Starting From $8.37

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Overview

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.

Applications

Handheld Terminals
Notebook and Subnotebook Computers

Part Models: 2
1ku List Price: Starting From $8.37

Documentation

Data Sheet 1

MAX1870A: Step-Up/Step-Down Li+ Battery Charger Data Sheet (Rev.3) 09/01/2015

Reliability Data 1

MAX1870A Reliability Data 01/12/2023

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1870AETJ+	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1870AETJ+T	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX1870AETJ+	PRODUCTION
MAX1870AETJ+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX1870A

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Features and Benefits

Step-Up/Step-Down Topology

Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.

+10V to +25V Input Voltage Range

2.4A (max) Battery Charge Current

Up to 17.6V Battery Compliance Voltage

±0.5% Charge-Voltage Accuracy

Input Current Limiting

Analog Inputs Control Charge Current, Charge Voltage, and Input Current Limit

Analog Output Indicates Input Current

Fully Assembled And Tested

Surface-Mount Components

Product Details

The MAX1870A evaluation kit (EV kit) is an accurate and efficient multichemistry battery charger. It uses analog inputs to control charge voltage and current. The EV kit can charge any battery with charge current up to 2.4A. High efficiency is achieved by a buck-boost topology. The EV kit provides outputs that can be used to monitor the input current and the presence of an AC adapter.

The MAX1870A EV kit is a fully assembled and tested surface-mount printed circuit (PC) board.