LTC4085-1
USB Power Manager with Ideal Diode Controller and 4.1V Li-Ion Charger
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Overview
Features and Benefits
- 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
Product Details
The LTC4085-1 is a USB power manager and Li-Ion 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 LTC4085-1 includes a complete constant-current/constant-voltage linear charger for single cell Li-Ion batteries. This 4.1V version of the standard LTC4085 is intended for applications which will be operated or stored above approximately 60°C. Under these conditions, a reduced foat voltage will trade-off initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells.
The LTC4085-1 also includes a programmable termination timer, automatic recharging, an end-of-charge status output and an NTC thermistor.
The LTC4085-1 is available in a 14-lead low profile 4mm × 3mm DFN package.
| 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: Cameras, MP3 Players, PDAs
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
-
R540 Reliability Data3/26/2018
-
I2C Battery Gas Gauges11/17/2011
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
LTC4085
LTC4085-1
LTC4085-3
LTC4085-4
Product Recommendations
LTC4085-1 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC4085EDE-1#PBF | Material Declaration | Reliability Data | 14-Lead DFN (4mm x 3mm w/ EP) | |
| LTC4085EDE-1#TRPBF | Material Declaration | Reliability Data | 14-Lead DFN (4mm x 3mm w/ EP) | |
| Wafer Fabrication Data | R540 Reliability Data |
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Buy Now Pricing
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List Pricing
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Lead Times
Please see the latest communication from our CCO regarding lead times.
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