LT3651-4.X

RECOMMENDED FOR NEW DESIGNS

Monolithic 4A High Voltage 1 Cell Li-Ion Battery Charger

Part Models: 8
1ku List Price: Starting From $4.93

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Part Details

Wide Input Voltage Range: Up to 32V (40V Absolute Maximum)
Programmable Charge Current Up to 4A
Selectable C/10 or On-board Timer Termination
Dynamic Charge Rate Programming/Soft-Start
Programmable Input Current Limit
0.5% Float Voltage Accuracy
7.5% Charge Current Accuracy
4% C/10 Detection Accuracy
NTC Resistor Temperature Monitor
Auto-Recharge at 97.5% Float Voltage
Auto-Precondition <70% Float Voltage
Bad Battery Detection with Auto-Reset
Average Current Mode, Synchronous Switcher
User Programmable Frequency
Low Profile (0.75mm) 5mm × 6mm 36-Pin QFN Package

The LT3651 is a 1 cell 4A Li-Ion/Polymer battery charger that operates with input voltages up to 32V. An efficient monolithic average current mode synchronous switching regulator provides constant current, constant voltage charging with programmable maximum charge current. A charging cycle starts with battery insertion or when the battery voltage drops 2.5% below the float voltage. Charger termination is selectable as either charge current or internal safety timer timeout. Charge current termination occurs when the charge current falls to one-tenth the programmed maximum current (C/10). Timer based termination is typically set to three hours and is user programmable (charging continues below C/10 until timeout). Once charging is terminated, the LT3651 supply current drops to 85μA into a standby mode.

The LT3651 offers several safety features. A discharged battery is preconditioned with a small trickle charge and generates a signal if unresponsive. A thermistor monitors battery temperature, halting charging if out of range. Excessive die temperature reduces charge current. Charge current is also reduced to maintain constant input current to prevent excessive input loading.

The LT3651 is available in a 5mm × 6mm 36-pin QFN package.


	Float Voltage
LT3651-4.1	4.1V
LT3651-4.2	4.2V
LT3651-8.2	8.2V
LT3651-8.4	8.4V

Applications

Industrial Handheld Instruments
12V to 24V Automotive and Heavy Equipment
Desktop Cradle Chargers
Notebook Computers

Part Models: 8
1ku List Price: Starting From $4.93

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
LT3651EUHE-4.1#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3651EUHE-4.1#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3651EUHE-4.2#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3651EUHE-4.2#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3651IUHE-4.1#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3651IUHE-4.1#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3651IUHE-4.2#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3651IUHE-4.2#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
µModule Battery Chargers 1
LTM8061	RECOMMENDED FOR NEW DESIGNS	32V, 2A μModule (Power Module) Li-Ion/Polymer Battery Charger
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
PowerPath, Ideal Diodes, and Load Switches 1
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection
Pushbutton Controllers 1
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3651-4.1
LT3651-4.2
LT3651-8.2
LT3651-8.4

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LT3651EUHE-4.2 Demo Board | 6.5V ≤ VIN ≤ 32V, 4A Li-Ion Battery Charger, VOUT = 4.2V @ 4A

Buy Now View Details

Product Details

Demonstration circuit 1362A-A (4.2V fixed output) is a 4A high voltage Li-Ion battery charger featuring the LT3651EUHE-4.2. The LT3651 is a complete, high power Li-Ion battery charger that can operate over a wide input voltage range. The charger is a constant-current, constant-voltage type with a maximum charge current of 4A that can be externally set. A precondition feature trickle charges a low voltage battery and bad battery detection provides a signal if the battery doesn’t respond to preconditioning. The LT3651EUHE is available in a 36-lead (5mm × 6mm) QFN surface mount package with two exposed thermal pads.

Resources

DC1362A - Demo Manual
603.00K

DC1362A - Design Files
815.00K

DC1362A - Schematic
73.00K

LT3651EUHE-4.1 Demo Board | 6.5V ≤ VIN ≤ 32V, 4A Li-Ion Battery Charger, VOUT = 4.1V @ 4A

Buy Now View Details

Product Details

Demonstration circuit 1362A-B (fixed 4.1V output) is a 4A high voltage Li-Ion battery charger featuring the LT3651EUHE-4.1. The LT3651 is a complete, high power Li-Ion battery charger that can operate over a wide input voltage range. The charger is a constant-current, constant-voltage type with a maximum charge current of 4A that can be externally set. A precondition feature trickle charges a low voltage battery and bad battery detection provides a signal if the battery doesn’t respond to preconditioning. The LT3651EUHE is available in a 36-lead (5mm × 6mm) QFN surface mount package with two exposed thermal pads.

Resources

DC1362A - Demo Manual
603.00K

DC1362A - Design Files
815.00K

DC1362A - Schematic
73.00K

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LT3651-4.X

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Technical Articles 1

Product Selector Card 1

Solutions Bulletin & Brochure 2

Hardware Ecosystem

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

Evaluation Kits

Product Details

Resources

Product Details

Resources

Latest Discussions

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