LTC4120
LTC4120-4.2
RECOMMENDED FOR NEW DESIGNS
Wireless Power Receiver and 400mA Buck Battery Charger
- Part Models
- 8
- 1ku List Price
- Starting From $4.92
Overview
- Dynamic Harmonization Control Optimizes Wireless Charging Over a Wide Coupling Range
- Wide Input Voltage Range (12.5V to 40V)
- Adjustable Float Voltage (3.5V to 11V)
- Fixed 4.2V Float Voltage Option (LTC4120-4.2)
- 50mA to 400mA Charge Current Programmed with a Single Resistor
- ±1% Feedback Voltage Accuracy
- Programmable 5% Accurate Charge Current
- No Microprocessor Required
- No Transformer Core
- Thermally Enhanced, Low Profile 16-Lead (3mm × 3mm × 0.75mm) QFN Package
The LTC4120 is a constant-current/constant-voltage wireless receiver and battery charger. An external programming resistor sets the charge current up to 400mA. The LTC4120-4.2 is suitable for charging Li-Ion/Polymer batteries, while the programmable float voltage of the LTC4120 accommodates several battery chemistries. The LTC4120 uses a Dynamic Harmonization Control (DHC) technique that allows high efficiency contactless charging across an air gap.
The LTC4120 regulates its input voltage via the DHC pin. This technique modulates the resonant frequency of a receiver tank to automatically adjust the power received as well as the power transmitted to provide an efficient solution for wirelessly charging battery-powered devices.
Wireless charging with the LTC4120 provides a method to power devices in harsh environments without requiring expensive failure-prone connectors. This allows products to be charged while locked within sealed enclosures, or in moving or rotating equipment, or where cleanliness or sanitation is critical.
This full featured battery charger includes accurate RUN pin threshold, low voltage battery preconditioning and bad battery fault detection, timer termination, auto-recharge, and NTC temperature qualified charging. The FAULT pin provides an indication of bad battery or temperature faults.
Once charging is terminated, the LTC4120 signals end-of-charge via the CHRG pin, and enters a low current sleep mode. An auto-restart feature starts a new charging cycle if the battery voltage drops by 2.2%.
Applications
- Handheld Instruments
- Industrial/Military Sensors and Devices
- Harsh Environments
- Portable Medical Devices
- Physically Small Devices
- Electrically Isolated Devices
Documentation
Data Sheet 1
User Guide 2
Application Note 3
Technical Articles 3
Frequently Asked Question 1
Video 1
Product Selector Card 2
Brochure 1
Press Release 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 |
|---|---|---|---|
| LTC4120EUD#PBF | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LTC4120EUD#TRPBF | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LTC4120EUD-4.2#PBF | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LTC4120EUD-4.2#TRPBF | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LTC4120IUD#PBF | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LTC4120IUD#TRPBF | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LTC4120IUD-4.2#PBF | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LTC4120IUD-4.2#TRPBF | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) |
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 |
|---|---|---|
| Battery Charger ICs 1 | ||
| LTC4125 | RECOMMENDED FOR NEW DESIGNS | 5W AutoResonant Wireless Power Transmitter |
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC2956 | RECOMMENDED FOR NEW DESIGNS | Wake-Up Timer with Pushbutton Control |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC4123 | RECOMMENDED FOR NEW DESIGNS | Low Power Wireless Charger for Hearing Aids |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC4120
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.
Evaluation Kits
Wireless Power Transfer Demonstration Kit featuring the LTC4125EUFD and the LTC4120EUD
Resources
Wireless Power Transfer Demonstration Kit featuring the LTC4125EUFD and the LTC4120EUD
Resources
LTC4120EUD Demo Board | Wireless Power Receiver and 400mA Buck Battery Charger with Adjustable Charge Voltage and Separate Receiver Coil. DC2181A-B Requires a Transmitter such as DC1969A-B or The Proxi-Point Power-by-Proxi transmitter.
Resources
LTC4120EUD Demo Board | Wireless Power Receiver and 400mA Buck Battery Charger with Adjustable Charge Voltage and Separate Receiver Coil. DC2181A-B Requires a Transmitter such as DC1969A-B or The Proxi-Point Power-by-Proxi transmitter.
Resources
LTC4120EUD-4.2 Demo Board | Wireless Power Receiver and 400mA Buck Battery Charger with Fixed 4.2V charge voltage and separate receive coil. DC2181A-A requires a transmitter such as DC1969A-B or the Proxi-Point Power-by-Proxi transmitter.
Resources
LTC4120EUD-4.2 Demo Board | Wireless Power Receiver and 400mA Buck Battery Charger with Fixed 4.2V charge voltage and separate receive coil. DC2181A-A requires a transmitter such as DC1969A-B or the Proxi-Point Power-by-Proxi transmitter.