LTC4085-3
LTC4085-4

RECOMMENDED FOR NEW DESIGNS

USB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger

Part Models: 4
1ku List Price: Starting From $1.83

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Part Details

Seamless Transition Between Input Power Sources: Li-Ion/Polymer Battery, USB and 5V Wall Adapter
215mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provide Low Loss PowerPath^™ When Wall Adapter/USB Input Not Present
Load Dependent Charging Guarantees Accurate USB Input Current Compliance
3.95V Float Voltage Improves Battery Life Span and High Temperature Safety Margin
Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate without Risk of Overheating*
Selectable 100% or 20% Input Current Limit (e.g., 500mA/100mA)
Battery Charge Current Independently Programmable Up to 1.2A
Automatic Output Undervoltage Charge Current Reduction (LTC4085-3)
Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package

The LTC4085-3/LTC4085-4 is a USB power manager and Li-Ion/Polymer battery charger designed for portable battery-powered applications. The part controls the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 20% or 100% of a programmed value up to 1.5A (typically 100mA or 500mA). Battery charge current is automatically reduced such that the sum of the load current and charge current does not exceed the programmed input current limit.

The LTC4085-3/LTC4085-4 includes a complete constantcurrent/ constant-voltage linear charger for single cell Li-Ion batteries. These 3.95V versions of the standard LTC4085 are intended for applications which have extended battery lifetime requirements or those that require high temperature (approximately >60°C) operation or storage. Under these conditions, a reduced fl oat voltage will trade-off initial cell capacity for the benefi t of increased capacity retention over the life of the battery. A reduced fl oat voltage also minimizes swelling in prismatic and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells.

The LTC4085-3/LTC4085-4 also includes a programmable termination timer, automatic recharging, an end-of-charge status output and an NTC thermistor.


	Float Voltage (V)	NTC Hot Threshold	Undervoltage Current Limit
LTC4085	4.2V	29% Vvntc	Yes
LTC4085-1	4.1V	32.6% Vvntc	Yes
LTC4085-3	3.95V	32.6% Vvntc	Yes
LTC4085-4	3.95V	32.6% Vvntc	No

Applications

Portable USB Devices

No

Part Models: 4
1ku List Price: Starting From $1.83

Documentation

Data Sheet 1

LTC4085-3: USB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger Data Sheet 05/15/2012

Reliability Data 1

R540 Reliability Data 03/26/2018

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
LTC4085EDE-3#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4085EDE-3#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4085EDE-4#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4085EDE-4#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 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
LTC4085EDE-3#PBF	PRODUCTION
LTC4085EDE-3#TRPBF	PRODUCTION
LTC4085EDE-4#PBF	PRODUCTION
LTC4085EDE-4#TRPBF	PRODUCTION
Jul 31, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTC4085EDE-3#PBF	PRODUCTION
LTC4085EDE-3#TRPBF	PRODUCTION
Jun 30, 2020 - 20_0244 Notification of Wafer Fab Location Change for 0.6µm CMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0244_Form Material_Report Delta Qualification Matrix Qualification Results Summary Other
LTC4085EDE-3#PBF	PRODUCTION
LTC4085EDE-3#TRPBF	PRODUCTION
LTC4085EDE-4#PBF	PRODUCTION
LTC4085EDE-4#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
USB Isolators 1
LTM2884	PRODUCTION	Isolated USB Transceiver with Isolated Power

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4085
LTC4085-1
LTC4085-3
LTC4085-4

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.

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