Datasheet LTC4126 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 7.5mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter |
| Pages / Page | 22 / 1 — FEATURES. DESCRIPTION. Wireless Li-Ion Battery Charger Plus High. … |
| File Format / Size | PDF / 2.3 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. Wireless Li-Ion Battery Charger Plus High. Efficiency Multi-Mode Charge Pump DC/DC
Model Line for this Datasheet
Text Version of Document
LTC4126 7.5mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter
FEATURES DESCRIPTION
n
Wireless Li-Ion Battery Charger Plus High
The LTC®4126 is a low-power wireless single-cell Li-Ion
Efficiency Multi-Mode Charge Pump DC/DC
battery charger with an integrated step-down DC/DC n
Wideband Rx Frequency: DC to >10MHz
regulator. The step-down regulator is a low-noise multi- n Integrated Rectifier with Overvoltage Limit mode charge pump which is powered from the battery n Pin Selectable Charge Voltage: 4.2V or 4.35V and provides a regulated 1.2V at the output. The switching n Charge Current: 7.5mA (Fixed) frequency is set to either 50kHz or 75kHz depending on the n Low Battery Disconnect: 3.0V mode to keep any switching noise out of the audible range. n NTC Pin for Temperature Qualified Charging The LTC4126 charger is a full-featured constant-current n DC/DC Regulated Output: 1.2V constant-voltage Li-Ion battery charger with automatic n DC/DC Output Current: Up to 60mA recharge, automatic termination by safety timer, and n 50kHz/75kHz Switching, No Audible Noise battery temperature monitoring via an NTC pin. Charge n Pushbutton and/or Digital on/off Control for DC/DC current is fixed at 7.5mA with a 6-hour termination timer. n Thermally Enhanced 12-Lead 2mm × 2mm LQFN Undervoltage protection disconnects the battery from all Package loads when the battery voltage is below 3.0V. The tiny 2mm × 2mm LQFN package and minimal external
APPLICATIONS
component count make the LTC4126 well suited for Li-Ion n Hearing Aids battery powered hearing aid applications and other low n Low Power Li-Ion Powered Devices power portable devices where a small solution size is n Wireless Headsets required. n IoT Wearables All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Top and Bottom View of the IC with Complete Application Circuit
ACIN EN CRX STAT1 68nF DIGITAL I/O AIR GAP STAT2 VCC ACPR LTC4126 BAT L CHRG + Li-Ion TRANSMITTER L RX TX 8µH 4.2V NTC V + IN VSEL – OUT 1.2V GND 2.2µF 4126 TA01 TO BAT Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
Wireless Li-Ion Battery Charger Plus High
The LTC®4126 is a low-power wireless single-cell Li-Ion
Efficiency Multi-Mode Charge Pump DC/DC
battery charger with an integrated step-down DC/DC n
Wideband Rx Frequency: DC to >10MHz
regulator. The step-down regulator is a low-noise multi- n Integrated Rectifier with Overvoltage Limit mode charge pump which is powered from the battery n Pin Selectable Charge Voltage: 4.2V or 4.35V and provides a regulated 1.2V at the output. The switching n Charge Current: 7.5mA (Fixed) frequency is set to either 50kHz or 75kHz depending on the n Low Battery Disconnect: 3.0V mode to keep any switching noise out of the audible range. n NTC Pin for Temperature Qualified Charging The LTC4126 charger is a full-featured constant-current n DC/DC Regulated Output: 1.2V constant-voltage Li-Ion battery charger with automatic n DC/DC Output Current: Up to 60mA recharge, automatic termination by safety timer, and n 50kHz/75kHz Switching, No Audible Noise battery temperature monitoring via an NTC pin. Charge n Pushbutton and/or Digital on/off Control for DC/DC current is fixed at 7.5mA with a 6-hour termination timer. n Thermally Enhanced 12-Lead 2mm × 2mm LQFN Undervoltage protection disconnects the battery from all Package loads when the battery voltage is below 3.0V. The tiny 2mm × 2mm LQFN package and minimal external
APPLICATIONS
component count make the LTC4126 well suited for Li-Ion n Hearing Aids battery powered hearing aid applications and other low n Low Power Li-Ion Powered Devices power portable devices where a small solution size is n Wireless Headsets required. n IoT Wearables All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Top and Bottom View of the IC with Complete Application Circuit
ACIN EN CRX STAT1 68nF DIGITAL I/O AIR GAP STAT2 VCC ACPR LTC4126 BAT L CHRG + Li-Ion TRANSMITTER L RX TX 8µH 4.2V NTC V + IN VSEL – OUT 1.2V GND 2.2µF 4126 TA01 TO BAT Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
