LTC4091

RECOMMENDED FOR NEW DESIGNS

36V Battery Charger and Power Backup Manager

Part Models: 4
1ku List Price: Starting From $3.89

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Overview

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

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

Part Models: 4
1ku List Price: Starting From $3.89

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

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC4091EDJC#PBF	PRODUCTION
LTC4091EDJC#TRPBF	PRODUCTION
LTC4091IDJC#PBF	PRODUCTION
LTC4091IDJC#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Battery Charger ICs 1
LTC4090 LTC4090-5		USB Power Manager with 2A High Voltage Bat-Track Buck Regulator
Protection Switches & Controllers 2
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller
LTC4368	RECOMMENDED FOR NEW DESIGNS	100V UV/OV and Reverse Protection Controller with Bidirectional Circuit Breaker

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

Evaluation Kits

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

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Product Details

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.