LTC4012

PRODUCTION

High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control

Part Models: 12
1ku List Price: Starting From $3.78

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Part Details

General Purpose Battery Charger Controller
Efficient 550kHz Synchronous Buck PWM Topology
±0.5% Output Float Voltage Accuracy
Programmable Charge Current: 4% Accuracy
Programmable AC Adapter Current Limit: 3% Accuracy
No Audible Noise with Ceramic Capacitors
INFET Low Loss Ideal Diode PowerPath^™ Control
Wide Input Voltage Range: 6V to 28V
Wide Output Voltage Range: 2V to 28V
Indicator Outputs for AC Adapter Present, Charging, C/10 Current Detection and Input Current Limiting
Analog Charge Current Monitor
Micropower Shutdown
20-Pin 4mm × 4mm × 0.75mm QFN Package

The LTC4012 is a constant-current /constant-voltage battery charger controller. It uses a synchronous quasi-constant frequency PWM control architecture that will not generate audible noise with ceramic bulk capacitors. Charge current is set by external resistors and can be monitored as an output voltage. With no built-in termination, the LTC4012 family charges a wide range of batteries under external control.

The LTC4012 features fully adjustable output voltage, while the LTC4012-1 and LTC4012-2 can be pin-programmed for Lithium-Ion/Polymer battery packs of 1-, 2-, 3- or 4-series cells. The LTC4012-1 provides output voltage of 4.1V/cell and the LTC4012-2 is a 4.2V/cell version.

The device includes AC adapter input current limiting, which maximizes charge rate for a fixed input power level. An external sense resistor programs the input current limit, and the ICL status pin indicates reduced charge current as a result of AC adapter current limiting. Ideal diode control at the adaptor input improves charger efficiency.

The CHRG status pin is active during all charging modes, including special indication for low charge current.


	Vfloat	Vfloat Range	/ACP Pin
LTC4012	Adj.	2V-28V	Yes
LTC4012-1	4.1V	1-4 Li-Ion Cells	Yes
LTC4012-2	4.2V	1-4 Li-Ion Cells	Yes
LTC4012-3	Adj.	2V-28V	No

Applications

Notebook Computers
Portable Instruments
Battery Backup Systems

Part Models: 12
1ku List Price: Starting From $3.78

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
LTC4012CUF#PBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012CUF#TRPBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012CUF-1#PBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012CUF-1#TRPBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012CUF-2#PBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012CUF-2#TRPBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012IUF#PBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012IUF#TRPBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012IUF-1#PBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012IUF-1#TRPBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012IUF-2#PBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4012IUF-2#TRPBF	20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC4012CUF#PBF	PRODUCTION
LTC4012CUF#TRPBF	PRODUCTION
LTC4012CUF-1#PBF	PRODUCTION
LTC4012CUF-1#TRPBF	PRODUCTION
LTC4012CUF-2#PBF	PRODUCTION
LTC4012CUF-2#TRPBF	PRODUCTION
LTC4012IUF#PBF	PRODUCTION
LTC4012IUF#TRPBF	PRODUCTION
LTC4012IUF-1#PBF	PRODUCTION
LTC4012IUF-1#TRPBF	PRODUCTION
LTC4012IUF-2#PBF	PRODUCTION
LTC4012IUF-2#TRPBF	PRODUCTION
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC4012CUF#PBF	PRODUCTION
LTC4012CUF#TRPBF	PRODUCTION
LTC4012CUF-1#PBF	PRODUCTION
LTC4012CUF-1#TRPBF	PRODUCTION
LTC4012CUF-2#PBF	PRODUCTION
LTC4012CUF-2#TRPBF	PRODUCTION
LTC4012IUF#PBF	PRODUCTION
LTC4012IUF#TRPBF	PRODUCTION
LTC4012IUF-1#PBF	PRODUCTION
LTC4012IUF-1#TRPBF	PRODUCTION
LTC4012IUF-2#PBF	PRODUCTION
LTC4012IUF-2#TRPBF	PRODUCTION

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

Hardware Ecosystem

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Pushbutton Controllers 1
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller

Evaluation Kits

LTC4012CUF Demo Board | Multi-Chemistry 8A Buck Battery Charger with PowerPath Control

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Product Details

Demonstration circuit 1614 features the LTC4012CUF, a multi-chemistry single battery charger controller with PowerPath^™ control. The input supply voltage is 13.5V to 20V and is initially configured for a current limit of 10A. The charger float voltage is programmed by jumpers to support 1- to 4- series cells of both Li-Ion/Polymer and Li-iron phosphate (LiFePO4) at 4.2V/cell and 3.6V/cell, for a total of eight settings. The demo board is initially configured for constant-voltage charging of a 12.6V Li-Ion/ Polymer battery and constant-current charging at 8A, though current derating may be necessary due to certain operating conditions.

Resources

DC1614A - Schematic
117.00K

DC1614A - Design Files
2.00M

DC1614A - Demo Manual
324.00K

Software

DC1614A - Demo Board Software
1.00M

LTC4012CUF-2 Demo Board | Multi-Chemistry, 3A Sync Buck Battery Charger with PowerPath Control

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Product Details

Demonstration circuit DC1256A is a single-battery standalone battery charger that can support any version ofthe LTC4012 family of parts. The LTC4012 family of charge controller IC’s do not support charge termination for any specific battery chemistry. Any charger termination, if necessary, is accomplished outside the LTC4012 with the most common method using a microcontroller. The DC1256A is shipped with the LTC4012-2 installed,which is optimized for Li-ion charge applications using a 4.2V/cell float voltage.The charger output voltage is programmed by jumpers to support 1, 2, 3 and 4 series stack Li-ion batteries. The input voltage is can be between 6V and 20V with the maximum voltage of the Demo Board design limited by the input capacitor voltage ratings. To reach full charge,the minimum input voltage must be greater than the float voltage setting.

Resources

DC1256A - Design Files
1.00M

DC1256A - Demo Manual
568.00K

Software

DC1256A - Demo Board Software
1.00M

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LTC4012

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Application Note 1

Solutions Bulletin & Brochure 1

Product Selector Card 1

Hardware Ecosystem

Evaluation Kits

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Resources

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