DocumentationDatasheet
Reliability Data
Product Selector Card
Press Release
- USB Compatible High Efficiency Power Manager and Charger for 1-Cell Lithium Iron Phosphate Batteries
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Features
- Switching Regulator with Bat-Track™ Adaptive Output Control Makes Optimal Use of Limited Power Available from USB Port to Charge Battery and Power Application
- Charge Control Algorithm Specifically Designed for LiFePO4 (Lithium Iron Phosphate)
- Overvoltage Protection Guards Against Damage
- Bat-Track External Step-Down Switching Regulator Control Maximizes Efficiency from Automotive, Firewire and Other High Voltage Input Sources
- 180mΩ Internal Ideal Diode Plus External Ideal Diode Controller Seamlessly Provide Low Loss PowerPath™ When Input Power Is Limited or Unavailable
- Preset 3.6V Charge Voltage with 0.5% Accuracy
- Instant-On Operation with Discharged Battery
- 700mA Maximum Load Current from USB Port
- 2A Maximum Input Current from Internal Switching Regulator
- 1.5A Maximum Charge Current with Thermal Limiting
- 20-Lead 3mm × 4mm × 0.75mm QFN Package
Typical Application
Description
The LTC4098-3.6 is a high efficiency USB PowerPath controller and full-featured LiFePO4 battery charger. It seamlessly manages power distribution from multiple sources including USB, wall adapter, automotive, Firewire or other high voltage DC/DC converters, and a LiFePO4 battery.
The LTC4098-3.6 charge algorithm is optimized for LiFePO4 by implementing a 1-hour float voltage termination timer and a 0°C to 60°C NTC-based charge qualification range. Furthermore, completely discharged batteries are charged at the full programmed charge current.
The LTC4098-3.6’s switching regulator can automatically limit its input current for USB compatibility. For automotive and other high voltage applications, the LTC4098‑3.6 interfaces with an external switching regulator. Both the USB input and the auxiliary input controller feature Bat-Track optimized charging to provide maximum power to the application and reduced heat in high power density applications with input supplies from 5V to as high as 38V.
An overvoltage protection circuit guards the LTC4098-3.6 from high voltage damage on the VBUS pin with just two external components.
The LTC4098-3.6 is available in a 20-lead 3mm × 4mm × 0.75mm QFN surface mount package.
| Float Voltage |
|
| LTC4098 | 4.2V (1-cell Li-Ion/Li-Polymer) |
| LTC4098-1 | 4.1V (1-cell Li-Ion/Li-Polymer) |
| LTC4098-3.6 | 3.6V (1-cell LiFePO4) |
3x4 QFN-20
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC4098EUDC#PBF | QFN | 20 | E | $3.57 | $2.50 |
| LTC4098EUDC#TRPBF | QFN | 20 | E | $2.56 | |
| LTC4098EUDC-1#PBF | QFN | 20 | E | $3.57 | $2.50 |
| LTC4098EUDC-1#TRPBF | QFN | 20 | E | $2.56 | |
| LTC4098EUDC-3.6#PBF | QFN | 20 | E | $3.79 | $2.65 |
| LTC4098EUDC-3.6#TRPBF | QFN | 20 | E | $2.71 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1701A | LTC4098-3.6 with HV Buck regulator plug in interface | $150.00 |