LTC4126-ADJ
RECOMMENDED FOR NEW DESIGNSWireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter
- Part Models
- 2
- 1ku List Price
- Starting From $3.95
Overview
- Wireless Li-Ion Battery Charger Plus High Efficiency Multi-Mode Charge Pump DC/DC
- Programmable Charge Current from 1mA to 50mA Via an External Resistor
- Wideband Rx Frequency: DC to >10MHz
- Integrated Rectifier with Overvoltage Limit
- Charge Voltage: 4.2V
- Low Battery Disconnect: 3.0V
- NTC Pin for Temperature Qualified Charging
- DC/DC Regulated Output: 1.2V
- DC/DC Output Current: Up to 60mA
- 50kHz/75kHz Switching, No Audible Noise
- Pushbutton and/or Digital on/off Control for DC/DC
- Thermally Enhanced 12-Lead 2mm × 2mm LQFN Package
The LTC4126-ADJ is a low-power wireless single-cell Li-Ion battery charger with an integrated step-down DC/DC regulator. The step-down regulator is a low-noise multimode charge pump which is powered from the battery and provides a regulated 1.2V at the output. The switching frequency is set to either 50kHz or 75kHz depending on the mode to keep any switching noise out of the audible range.
The constant-current constant-voltage Li-Ion battery charger has automatic recharge, automatic termination by safety timer, and battery temperature monitoring via an NTC pin. Charge current is programmable from 1mA to 50mA via an external resistor. Undervoltage protection disconnects the battery from all loads when the battery voltage is below 3.0V.
The small package and minimal external component count make the LTC4126-ADJ and its variants suitable for hearing aid applications and other low power portable devices. See the chart in the data sheet.
APPLICATIONS
- Hearing Aids
- Low Power Li-Ion Powered Devices
- Wireless Headsets
- IoT Wearables
Documentation
Data Sheet 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 |
|---|---|---|---|
| LTC4126EV-ADJ#TRMPBF | 12-Lead LQFN (2mm x 2mm x 0.74mm) | ||
| LTC4126EV-ADJ#TRPBF | 12-Lead LQFN (2mm x 2mm x 0.74mm) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LTC4126-ADJ
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
LTC4126-ADJ 10mA Wireless Charger Demonstration Kit
Resources
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