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reference designLTC4126-ADJ

Analog Devices LTC4126-ADJ

Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter

Overview

TopologyWireless Power Transfer
Input voltage5 V
Switching frequency50-75 kHz
Output 11.2 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
760308103206
WE-WPCC Wireless Power Transfer Receiver Coil, Qi - Airfuel Alliance, 28,9 x 15,7 x 0,76 mm
Simu­lation
Downloads8 files

EDA models: Components ZIP

CAD files ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-WPCC Wireless Power Transfer Receiver Coil
ComplianceQi - Airfuel Alliance 
Size28,9 x 15,7 x 0,76 mm 
Inductance7.5 µH
Rated Current1.55 A
DC Resistance380 mΩ
Self Resonant Frequency23 MHz
Q-Factor16 %
Power Capability [1]20 W
760308101208
WE-WPCC Wireless Power Transfer Receiver Coil, works with Qi Rx IC's, Ø 10 x 1.6 mm
Simu­lation
Downloads8 files

EDA models: Components ZIP

CAD files ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-WPCC Wireless Power Transfer Receiver Coil
Complianceworks with Qi Rx IC's 
SizeØ 10 x 1.6 mm 
Inductance13 µH
Rated Current0.8 A
DC Resistance500 mΩ
Self Resonant Frequency26 MHz
Q-Factor17 %
Power Capability [1]15 W