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Data Sheet

FULL DATA SHEET (PDF, 188kB) Download   E-Mail

Description

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.

Key Features		Applications/Uses
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		Desktop Cradle Chargers Handheld Instruments (PDAs, Palmtops) Li+ Battery Packs Notebook Computers

Diagram

Typical Operating Circuit

Application Notes

Application Note 913: Switch-Mode, Linear, and Pulse Charging Techniques for Li+ Battery in Mobile Phones and PDAs - MAX1737 Application Note 1817: Reduce Component Count and Cut Costs by Disabling the MAX1737 Source-Current Loop - MAX1737 Application Note 3841: Improving Accuracy of the MAX1737 Lithium-Ion Battery Charger - MAX1737 Application Note 4169: Understanding Li+ Battery Operation Lessens Charging Safety Concerns - MAX1737

Evaluation Kits

MAX1737EVKIT

Reliability Reports

Show FIT data for: MAX1737 Reliability Report: MAX1737EEI.pdf

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-4 of 4
MAX1737	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1737EEI			QSOP;28 pin;62 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1737EEI-T			QSOP;28 pin;62 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1737EEI+			QSOP;28 pin;62 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1737EEI+T			QSOP;28 pin;62 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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