LT3651-4.X

RECOMMENDED FOR NEW DESIGNS

LT3651-4.X

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

RECOMMENDED FOR NEW DESIGNS

6.5V to 32V Single Cell 4A Charger slide

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Part Models 8

1ku List Price Starting From $4.93

Features

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

Additional Details

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

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 8

1ku List Price Starting From $4.93

Technical Documents 5

LT3651-4.1: Monolithic 4A High Voltage 1 Cell Li-Ion Battery Charger Data Sheet 11/02/2015

R541 Reliability Data 03/26/2018

DC1362A - Demo Manual 02/15/2013

Reverse Voltage Protection for Battery Chargers 06/01/2020

4A Li-Ion Battery Charger Accepts Inputs to 32V 04/01/2013

Reference Materials 3

Industrial Battery Chargers Overview 10/17/2023

Charge BIG Batteries Fast 06/27/2011

20V Battery Gas Gauge 10/22/2013

Design Resources 8

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

LT3651EUHE-4.1#PBF
Pin/Package Drawing
36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3651EUHE-4.1#TRPBF
Pin/Package Drawing
36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3651EUHE-4.2#PBF
Pin/Package Drawing
36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3651EUHE-4.2#TRPBF
Pin/Package Drawing
36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3651IUHE-4.1#PBF
Pin/Package Drawing
36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3651IUHE-4.1#TRPBF
Pin/Package Drawing
36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3651IUHE-4.2#PBF
Pin/Package Drawing
36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3651IUHE-4.2#TRPBF
Pin/Package Drawing
36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Companion Parts 4

Parts	Product Life Cycle	Description
µModule Battery Chargers1
LTM8061	RECOMMENDED FOR NEW DESIGNS	32V, 2A μModule (Power Module) Li-Ion/Polymer Battery Charger
Dual-Supply Monitors1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
PowerPath, Ideal Diodes, and Load Switches1
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection
Pushbutton Controllers1
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On

DC1362A-A

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

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

Download

DC1362A-A

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

Buy Now View Details

Product Detail

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

PDF

DC1362A - Demo Manual

603.00K

ZIP

DC1362A - Design Files

815.00K

PDF

DC1362A - Schematic

73.00K

DC1362A-B

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

DC1362A-B

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

Buy Now View Details

Product Detail

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

PDF

DC1362A - Demo Manual

603.00K

ZIP

DC1362A - Design Files

815.00K

PDF

DC1362A - Schematic

73.00K

DC1362A-A

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

DC1362A-B

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

LTspice 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.