MAX1737

PRODUCTION

Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller

Data Sheet (Rev. 5) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.50

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Overview

Stand-Alone Charger for Up to Four Li+ Cells
±0.8% Accurate Battery Regulation Voltage
Low Dropout: 98% Duty Cycle
Safely Precharges Near-Dead Cells
Continuous Voltage and Temperature Monitoring
< 1µA Shutdown Battery Current
Input Voltage Up to +28V
Safety Timer Prevents Overcharging
Input Current Limiting
Space-Saving 28-Pin QSOP
300kHz PWM Oscillator Reduces Noise
90% Conversion Efficiency

The MAX1737 is a switch-mode lithium-ion (Li+) battery charger that charges one to four cells. It provides a regulated charging current and a regulated voltage with only a ±0.8% total voltage error at the battery terminals. The external N-channel switch and synchronous rectifier provide high efficiency over a wide input voltage range. A built-in safety timer automatically terminates charging once the adjustable time limit has been reached.

The MAX1737 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. An additional control loop monitors the total current drawn from the input source to prevent overload of the input supply, allowing the use of a low-cost wall adapter.

The per-cell battery voltage regulation limit is set between +4.0V and +4.4V and can be set from one to four by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging if the battery temperature is outside the acceptable range.

The MAX1737 is available in a space-saving 28-pin QSOP package. Use the evaluation kit (MAX1737EVKIT) to help reduce design time.

Applications

Desktop Cradle Chargers
Handheld Instruments (PDAs, Palmtops)
Li+ Battery Packs
Notebook Computers

Part Models: 2
1ku List Price: Starting From $3.50

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
MAX1737EEI+	28-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1737EEI+T	28-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Battery Charger ICs 1
MAX745	PRODUCTION	Switch-Mode Lithium-Ion Battery-Charger

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Design Note 4

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