MAX1873

PRODUCTION

Simple Current-Limited Switch-Mode Li+ Charger Controller

Lowest Cost Switch-Mode Li+ Charger includes Input-Current Limiting Loop

Data Sheet (Rev. 0) Product Selection Table

Part Models: 6
1ku List Price: Starting From $2.36

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Overview

Low-Cost and Simple Circuit
Charges 2-, 3-, or 4-Series Lithium-Ion Cells
AC Adapter Input-Current-Limit Loop
Also Charges Ni-Based Batteries
Analog Output Monitors Charge Current
±0.75% Battery-Regulation Voltage
5µA Shutdown Battery Current
Input Voltage Up to 28V
200mV Dropout Voltage/100% Duty Cycle
Adjustable Charging Current
300kHz PWM Oscillator Reduces Noise
Space-Saving 16-Pin QSOP
MAX1873 Evaluation Kit Available to Speed Designs

The low-cost MAX1873R/S/T provides all functions needed to simply and efficiently charge 2-, 3-, or 4-series lithium-ion cells at up to 4A or more. It provides a regulated charging current and voltage with less than ±0.75% total voltage error at the battery terminals. An external P-channel MOSFET operates in a step-down DC-DC configuration to efficiently charge batteries in low-cost designs.

The MAX1873R/S/T regulates the battery voltage and charging current using two control loops that work together to transition smoothly between voltage and current regulation. An additional control loop limits current drawn from the input source so that AC adapter size and cost can be minimized. An analog voltage output proportional to charging current is also supplied so that an ADC or microcontroller can monitor charging current.

The MAX1873 may also be used as an efficient current-limited source to charge NiCd or NiMH batteries in multichemistry charger designs. The MAX1873R/S/T is available in a space-saving 16-pin QSOP package. Use the evaluation kit (MAX1873EVKIT) to help reduce design time.

Applications

2-, 3-, or 4-Cell Li+ Battery Pack Chargers
6-, 9-, or 10-Cell Li+ Battery Pack Chargers
Desktop Cradle Chargers
Handheld Instruments (PDAs, Palmtops)
Notebook Computers
Portable Desktop Assistants (PDAs)
Portable Internet Tablets

Part Models: 6
1ku List Price: Starting From $2.36

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
MAX1873REEE+	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1873REEE+T	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1873SEEE+	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1873SEEE+T	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1873TEEE+	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1873TEEE+T	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Mar 13, 2023 - 2361N WAFER FAB
		pcn_2361n
MAX1873REEE+	PRODUCTION
MAX1873REEE+T	PRODUCTION
MAX1873SEEE+	PRODUCTION
MAX1873SEEE+T	PRODUCTION
MAX1873TEEE+	PRODUCTION
MAX1873TEEE+T	PRODUCTION
Jan 24, 2019 - 1746N ASSEMBLY
		pcn_1746n
MAX1873REEE+	PRODUCTION
MAX1873REEE+T	PRODUCTION
MAX1873SEEE+	PRODUCTION
MAX1873SEEE+T	PRODUCTION
MAX1873TEEE+	PRODUCTION
MAX1873TEEE+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 MAX1873

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Features and Benefits

Input-Current Source Limiting
Charges 4 Lithium-Ion Batteries
Also Charges Ni-Based Batteries
Up to 28V Input
300kHz PWM Operation
16-Pin QSOP Package
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1873 evaluation kit (EV kit) is a complete, fully assembled and tested PC board that is capable of supplying power to a system load while charging a lithium-ion (Li+) or nickel (Ni)-based battery pack. The EV kit is preset to limit the total source current and the maximum battery-charging current to 3A, and to charge 4-series Li+ cells up to 4.2V each. An analog output voltage proportional to the charging current also permits an ADC or microcontroller to monitor the charging current. The EV kit requires a power source with a minimum output of 18.5V.

The EV kit can be reconfigured to limit the total input current drawn from the power source, the maximum battery-charging current, and the charging cell voltage. The Li+ cell voltage can be set between 4.009V and 4.387V using standard 1% resistors. To charge Li+ battery packs with two or three cells, replace the IC on the EV kit board with one of the ICs listed on the Parts Selection Table.

Applications

2-, 3-, or 4-Cell Li+ Battery Pack Chargers
6-, 9-, or 10-Cell Li+ Battery Pack Chargers
Desktop Cradle Chargers
Handheld Instruments (PDAs, Palmtops)
Notebook Computers
Portable Desktop Assistants (PDAs)
Portable Internet Tablets

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Overview

Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1