LTC4040

Name: LTC4040
Brand: Analog Devices
Price: 4.42 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

2.5A Battery Backup Power Manager

Data Sheet Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.42

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Overview

Step-Up Backup Supply and Step-Down Battery Charger
6.5A Switches for 2.5A Backup from 3.2V Battery
Input Current Limit Prioritizes Load Over Charge Current
Input Disconnect Switch Isolates Input During Backup
Automatic Seamless Switch-Over to Backup Mode
Input Power Loss Indicator
System Power Loss Indicator
Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V) or LiFePO₄ (3.45V/3.5V/3.55V/3.6V)
Optional OVP Circuitry Protects Device to >60V
Constant Frequency Operation
Low Profile (0.75mm) 24-Lead 4mm × 5mm QFN Package

Part Models: 4
1ku List Price: Starting From $4.42

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
LTC4040EUFD#PBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4040EUFD#TRPBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4040IUFD#PBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4040IUFD#TRPBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliability Report 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
LTC4040EUFD#PBF	PRODUCTION
LTC4040EUFD#TRPBF	PRODUCTION
LTC4040IUFD#PBF	PRODUCTION
LTC4040IUFD#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
Hot Swap Controllers 1
LTC4231	RECOMMENDED FOR NEW DESIGNS	Micropower Hot Swap Controller
Ideal Diodes and PowerPath Controllers 1
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller

Parts	Product Life Cycle	Description
LTC4110	PRODUCTION	Battery Backup System Manager

Evaluation Kits

OBSOLETE: LTC4040 Demo Board | 5VIN, 2A Single Cell Li-ion/LiFePO4 Buck Battery Charger with 2.5A Boost Backup Power Manager

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Product Details

This evaluation board is obsolete and no longer recommended.

Demonstration circuit 2118A is a combination step-down battery charger and step-up battery backup regulator using the LTC4040 monolithic system power manager. The DC2118A has an input voltage range from 4.8V to 5.5V with overvoltage protection (OVP) to 40V, as limited by the external MOSFET. The input current is monitored to prioritize the load up to the 2.5A threshold before charge current is reduced.

Resources

DC2118A - Design Files
9/3/2015

DC2118A - Demo Manual
9/3/2015

DC2118A - Schematic
9/3/2015

LTC4040 Demo Board | 5VIN, 2A Single Cell Li-ion/LiFePO4 Buck Battery Charger with 2.5A Boost Backup Power Manager

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Product Details

Demonstration circuit 2118B is a combination step-down battery charger and step-up battery backup regulator using the LTC4040 monolithic system power manager. The DC2118B has an input voltage range from 4.8V to 5.5V with overvoltage protection (OVP) to 40V, as limited by the external MOSFET. The input current is monitored to prioritize the load up to the 2.5A threshold before charge current is reduced.

Battery Charging

As initially configured, DC2118B is programmed for 2A charge current limit when in charge mode. The charge voltage is jumper-selectable in 8 discrete steps from 3.45V to 3.6V for LiFePO₄ chemistry or 3.95V to 4.1V for Li-ion chemistry, according to the F2/F1/F0 programming input settings.

The charge current limit is adjustable via the PROG pin resistor. End-of-charge status is triggered by current falling below C/8 and indicated by the CHRG LED. The optional NTC input provides temperature fault detection and status indicated by the FAULT LED. Charging can be enabled/disabled with the ENCHG jumper.

Battery Backup

Following an input power failure, the circuit automatically shifts to battery backup boost mode to regulate the VSYS output rail. The backup mode system output voltage is initially programmed for 5V. The input power failure status is indicated by the PFO LED.

If VSYS ever falls below the programmed reset threshold voltage, the RST LED will change states to indicate the need to reset the system and recharge the battery. Backup regulation can be enabled/disabled with the ENBST jumper.

For convenience, all LEDs can be disabled with the LED jumper to reduce the quiescent current of the system.