LTC4085-3 LTC4085-4
RECOMMENDED FOR NEW DESIGNSUSB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger
- Part Models
- 4
- 1ku List Price
- Starting From $2.31
Overview
- 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
Documentation
Data Sheet 1
Brochure 1
Product Selector Card 1
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) | ||
| LTC4085EDE-3#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC4085EDE-4#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC4085EDE-4#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| 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) |
||
| 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) |
||
| 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
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Interface Transceivers 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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