LTC4124

RECOMMENDED FOR NEW DESIGNS

100mA Wireless Li-Ion Charger with Low Battery Disconnect

Data Sheet (Rev. A) Product Selection Table
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Overview

  • Complete Wireless Power Receiver, Li-Ion Charger and PowerPath™ Controller
  • Wireless Input Power Control and Rectification
  • Wideband Wireless Power Frequency: DC to >10MHz
  • Pin-Selectable Charge Current: 10mA/25mA/50mA/100mA
  • Pin-Selectable Charge Voltage: 4.0V/4.1V/4.2V/4.35V
  • Pin-Selectable Low Battery Disconnect: 2.7V/3.2V
  • Zero Battery Drain Current in Disconnect/Ship Mode
  • Pin-Selectable Low Battery Pre-Charge Current Enable
  • NTC Input for Temperature Qualified Charging
  • Safety Charge Termination Timer
  • Tiny Total Solution Size with Few Externals
  • Small Thermally Enhanced 12-lead 2mm × 2mm LQFN Package

The LTC4124 is a simple high performance wireless Li-Ion charger with low battery disconnect. The pin-selectable charge current (up to 100mA) and charge voltage ensure versatility while minimizing the number of required external components.

Wireless charging with the LTC4124 allows devices to be charged while sealed within enclosures and eliminates bulky connectors in space-constrained applications. Elimination of exposed conductive connectors also creates more robust devices while ensuring an effortless end-user experience.

The LTC4124 includes an NTC input for safe temperature qualified charging and a battery disconnect feature that prevents damage to a battery due to over-discharging.

The 2mm × 2mm LQFN package and minimal number of external components make the LTC4124 well-suited for low power portable applications where small solution size is mandatory.

Applications

  • Medical Wireless Sensors
  • Military Wearables
  • High End Wireless Headsets
  • Streaming Headsets with Bluetooth Connectivity
  • Virtual Reality Headsets
  • High End Remote Control
  • IoT Devices
LTC4124
100mA Wireless Li-Ion Charger with Low Battery Disconnect
LTC4124 Application Circuit LTC4124 Application Circuit LTC4124 Pin Configuration
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Documentation

Data Sheet 1

User Guide 4

Technical Articles 2

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC4124
LTspice

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

eval board
schematic 1
schematic 2
schematic 3
DC2769A-A

LTC6990/LTC4124 Demo Board | 10mA Wireless Li-Ion Charger Demonstration Kit

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Product Details

DC2769A-A-KIT is a kit of the DC2771A-A transmitter board, featuring LTC6990, the DC2775A-A, featuring LTC4124, and the DC2774A application-sized receiver board featuring LTC4124. The DC2775A-A receiver can charge a single Li-Ion battery at up to 10mA with an air gap of 0.5mm between the transmit and receive coils. 

eval board
schematic 4
schematic 5
DC2769A-B

LTC6990/LTC4124 Demo Board | 25mA Wireless Li-Ion Charger Demonstration Kit

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Product Details

DC2769A-B-KIT is a kit of the DC2771A-B transmitter board, featuring LTC6990 and the DC2775A-B, featuring LTC4124. The DC2775A-B receiver can charge a single Li-Ion battery at up to 25mA with an air gap of 2mm to 5mm between the transmit and receive coils. 

eval board
schematic 6
schematic 7
schematic 8
DC2770A-A-KIT

LTC4124/LTC4125, 50mA Wireless Li-Ion Charger Demonstration Kit

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Product Details

DC2770A-A-KIT is a kit of the DC2773A-A transmitter board (featuring LTC4125) and the DC2775A-C (featuring LTC4124). The DC2775A-C receiver board can charge a single Li-Ion battery at up to 50 mA with an air gap of 3.0 mm to 5.0 mm between the transmit and receive coils. The DC2773A-A transmitter board supports Foreign Object Detection via the LTC4125.

eval board
schematic 9
schematic 10
schematic 11
DC2770A-B-KIT

LTC4124/LTC4125, 100mA Wireless Li-Ion Charger Demonstration Kit

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Product Details

DC2770A-B-KIT is a kit of the DC2773A-B transmitter board (featuring LTC4125) and the DC2775A-D (featuring LTC4124). The DC2775A-D receiver board can charge a single Li-Ion battery at up to 100 mA with an air gap of 3.0 mm to 5.0 mm between the transmit and receive coils. The DC2773A-B transmitter supports Optimum Power Search and Foreign Object Detection features via LTC4125.

DC2769A-A
LTC6990/LTC4124 Demo Board | 10mA Wireless Li-Ion Charger Demonstration Kit
DC2769A-A-KIT Image DC2769A-A-KIT Image DC2769A-A-KIT Application Circuit
DC2769A-B
LTC6990/LTC4124 Demo Board | 25mA Wireless Li-Ion Charger Demonstration Kit
DC2769A-B-KIT Image DC2769A-B-KIT Image
DC2770A-A-KIT
LTC4124/LTC4125, 50mA Wireless Li-Ion Charger Demonstration Kit
DC2770A-A-KIT Image DC2770A-A-KIT Image DC2770A-A-KIT Image
DC2770A-B-KIT
LTC4124/LTC4125, 100mA Wireless Li-Ion Charger Demonstration Kit
DC2770A-B-KIT Image DC2770A-B-KIT Image DC2770A-B-KIT Image

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