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Overview
| Topology | Wireless Power Transfer |
| Input voltage | 4.75-5.25 V |
| Switching frequency | 50-75 kHz |
| Output 1 | 1.2 V |
Description
The LT C®4126-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 multi-mode 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.
Features
- Wireless Li-Ion Battery Charger Plus HighEfficiency Multi-Mode Charge Pump DC/DC
- Programmable Charge Current from 1mA to 50mAVia 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
Typical applications
- Hearing Aids, Low Power Li-Ion Powered Devices, Wireless Headsets, IoT Wearables
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Compliance | Size | L(µH) | IR(A) | RDC max.(mΩ) | fres(MHz) | Q(%) | P(W) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-WPCC Wireless Power Transfer Transmitter Coil, works with Qi Tx IC's, Ø 20 x 2.8 mm | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-WPCC Wireless Power Transfer Transmitter Coil | Complianceworks with Qi Tx IC's | SizeØ 20 x 2.8 mm | Inductance6.8 µH | Rated Current2.5 A | DC Resistance130 mΩ | Self Resonant Frequency20 MHz | Q-Factor42 % | Power Capability [1]50 W |