LTC4085-3LTC4085-4 Series

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

Catalog

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

Part	Battery Chemistry	Supplier Device Package	Number of Cells	Voltage - Supply (Max)	Interface	Operating Temperature [Max]	Operating Temperature [Min]	Current - Charging	Mounting Type	Package / Case	Battery Pack Voltage	Charge Current - Max	Fault Protection	Programmable Features
Analog Devices LTC4085EDE-3#TRPBF	Lithium Ion/Polymer	14-DFN (4x3)	1	5.5 V	USB	85 °C	-40 °C	Constant - Programmable	Surface Mount	14-WFDFN Exposed Pad	3.95 V	1.5 A
Analog Devices LTC4085EDE-1#PBF	Lithium Ion	14-DFN (4x3)	1	5.5 V	USB	85 °C	-40 °C	Constant - Programmable	Surface Mount	14-WFDFN Exposed Pad	4.1 V	1.5 A
Analog Devices LTC4085EDE-4#PBF	Lithium Ion/Polymer	14-DFN (4x3)	1	5.5 V	USB	85 °C	-40 °C	Constant - Programmable	Surface Mount	14-WFDFN Exposed Pad	3.95 V	1.5 A
Analog Devices LTC4085EDE-4#PBF	Lithium Ion/Polymer	14-DFN (4x3)	1	5.5 V	USB	85 °C	-40 °C	Constant - Programmable	Surface Mount	14-WFDFN Exposed Pad	3.95 V	1.5 A	Over Temperature	Current

Catalog

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

Key Features

• Seamless Transition Between Input Power Sources: Li-Ion 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

• 4.1V 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

• Preset 4.1V Charge Voltage with 0.8% Accuracy

• C/10 Charge Current Detection Output

• Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package

Description

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 ThresholdUndervoltage Current LimitLTC40854.2V29% VvntcYesLTC4085-14.1V32.6% VvntcYesLTC4085-33.95V32.6% VvntcYesLTC4085-43.95V32.6% VvntcNoApplicationsPortable USB DevicesNo