LTC4091

RECOMMENDED FOR NEW DESIGNS

LTC4091

36V Battery Charger and Power Backup Manager

RECOMMENDED FOR NEW DESIGNS

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Part Models 4

1ku List Price Starting From $3.89

Features

Seamless Transition Between Primary Power Source and Li-Ion Battery
2A High Voltage Step-Down Regulator with Adaptive Output Control
Internal 75mΩ Ideal Diode Plus Optional External Ideal Diode Controller Provides Low Loss PowerPath^™ When Primary Supply Not Present
Wide Input Voltage Range: 6V to 36V (60V Abs Max)
4.45V Max Output Voltage
Full Featured Li-Ion Battery Charger
Pin Selectable 4.1V and 4.2V Charge Voltage Options
Thermally Enhanced Low Profile (0.75mm) 6mm × 3mm 22-Lead DFN Package

Additional Details

The LTC4091 is a 36V Li-Ion battery charger and power backup manager. The integrated step-down switching regulator charges a battery from a primary power source while providing power to the load. If primary power is lost, the load is seamlessly transitioned to the backup Li-ion/polymer battery. To protect sensitive downstream loads, the maximum output voltage is 4.45V.

The LTC4091 provides an adaptive output that tracks the battery voltage for high efficiency charging. The charge current is programmable and an end-of-charge status output (CHRG) indicates full charge. Also featured is a termination timer and an NTC thermistor input used to monitor battery temperature while charging.

During backup, an internal 75mΩ ideal diode connects the battery to the load. An optional external ideal diode FET driver is available to reduce the voltage drop even further. 4.1V or 4.2V battery charge voltages can be selected.

Applications

Fleet and Asset Tracking
Automotive GPS Data Loggers
Automotive Telematics Systems
Battery Backup Systems

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 4

1ku List Price Starting From $3.89

Technical Documents 3

LTC4091: 36V Battery Charger and Power Backup Manager Data Sheet 08/28/2017

DC2558A - Demo Manual 08/21/2017

Got Backup? Maintain Power Continuity 09/01/2018

Reference Materials 2

Power You Can Trust: Achieving Efficient Battery-Powered Solutions 11/07/2023

Industrial Battery Chargers Overview 10/17/2023

Design Resources 4

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
LTC4091EDJC#PBF	22-Lead DFN (6mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC4091EDJC#TRPBF	22-Lead DFN (6mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC4091IDJC#PBF	22-Lead DFN (6mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC4091IDJC#TRPBF	22-Lead DFN (6mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC4091EDJC#PBF
Pin/Package Drawing
22-Lead DFN (6mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC4091EDJC#TRPBF
Pin/Package Drawing
22-Lead DFN (6mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC4091IDJC#PBF
Pin/Package Drawing
22-Lead DFN (6mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC4091IDJC#TRPBF
Pin/Package Drawing
22-Lead DFN (6mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

Companion Parts 3

Parts	Product Life Cycle	Description
PowerPath, Ideal Diodes, and Load Switches1
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller
Surge Stopper, Overvoltage, and Overcurrent Protection1
LTC4368	RECOMMENDED FOR NEW DESIGNS	100V UV/OV and Reverse Protection Controller with Bidirectional Circuit Breaker
USB Power Manager (PowerPath, Battery Charger)1
LTC4090 LTC4090-5		USB Power Manager with 2A High Voltage Bat-Track Buck Regulator

Alternative Parts 1

Parts	Product Life Cycle	Description
LTC4040	RECOMMENDED FOR NEW DESIGNS	2.5A Battery Backup Power Manager

DC2558A

LTC4091 Demo Board | 36V Battery Charger and Power Backup Manager

LTC4091 Demo Board | 36V Battery Charger and Power Backup Manager

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DC2558A

LTC4091 Demo Board | 36V Battery Charger and Power Backup Manager

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Product Detail

Demonstration circuit 2558A is a high voltage switching buck regulator, Li-Ion cell charger and power backup manager. It is based on the LTC4091 and provides the following functions: 2A buck regulator with 7.5V-36V (60V absolute max) input range and with output voltage tracking cell voltage, full-featured cell charger with selectable 4.1V or 4.2V maximum charge voltage, and a power path manager for the cell. Output voltage is strictly limited to 4.45V. Temperature protection is optional with an external NTC temperature sensor.

Resources

PDF

DC2558A - Schematic