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Overview
| Topology | Wireless Power Transfer |
| Input voltage | 5 V |
| Switching frequency | 50-75 kHz |
| Output 1 | 4.2 V / 0 A |
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 760308101104 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-WPCC Wireless Power Transfer Transmitter Coil | works with Qi Tx IC's | Ø 20 x 2.8 mm | 6.8 | 2.5 | 130 | 20 | 42 | 50 | ||
 | 760308101208 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-WPCC Wireless Power Transfer Receiver Coil | works with Qi Rx IC's | Ø 10 x 1.6 mm | 13 | 0.8 | 500 | 26 | 17 | 15 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 760308101104 | SPEC | |
| 760308101208 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | Compliance | Size | L (µH) | IR (A) | RDC max. (mΩ) | fres (MHz) | Q | P (W) | Samples |
|---|