Analog Devices Inc. LTC4126EV-ADJ#TRMPBF

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Product attributes Property Value
Manufacturer Analog Devices Inc.
Product Series
Packaging Cut Tape (CT) | Tape & Reel (TR)
Battery Chemistry Lithium Ion
Number of Cells 1
Current - Charging Constant
Programmable Features Current, Timer
Fault Protection Undervoltage
Charge Current - Max 50mA
Battery Pack Voltage 4.2V
Voltage - Supply (Max) 5.5V
Interface -
Operating Temperature -20°C ~ 85°C (TJ)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case 12-VFQFN Exposed Pad
Supplier Device Package 12-LQFN (2x2)

The LTC4126EV-ADJ#TRMPBF from Analog Devices Inc. is a specialized low-current battery charger for single-cell Lithium Ion batteries. It provides a precise 50mA charge current and regulates the battery to 4.2V. With built-in Undervoltage protection and a compact 12-VFQFN package, it is engineered for applications requiring safe, low-current charging, such as wearables and backup systems.

  • Ultra-Low Charge Current: The 50mA output is ideal for safely charging small-capacity coin cells and backup batteries.
  • Precise Voltage Regulation: Maintains a tight 4.2V target for optimal battery health and longevity.
  • Undervoltage Protection: Prevents deep discharge damage by monitoring the battery state.
  • Minute Footprint: The 12-VFQFN package is one of the smallest available, perfect for miniaturized designs.
  • Reliable Operation: Designed for a junction temperature range of -20°C to 85°C.

Coin Cell Charging

Charge small single-cell Li-Ion coin cells in wearable devices, where the low 50mA charge current is perfectly suited for low-capacity batteries.

Wireless Sensor Nodes

Maintain trickle charge on remote sensors, using the low current to safely top up batteries over long periods without overcharging.

Medical Implants and Monitors

Provide a safe, low-current charging solution for compact medical devices, where precise voltage regulation (4.2V) and undervoltage protection are critical.

Memory Backup (SRAM)

Keep backup batteries for volatile memory fully charged in industrial equipment, ensuring data retention during power loss.

Energy Harvesting Systems

Pair with small energy harvesters to charge a buffer battery, using the low current draw to match the limited output of the harvester.

Q: What battery chemistry does this charger support?
A: It is designed for Lithium Ion batteries.
Q: How many cells can it charge?
A: It supports a single-cell (1) configuration.
Q: What is the maximum charge current?
A: The maximum charge current is 50mA.
Q: What is the battery voltage?
A: The battery voltage is 4.2V.
Q: What fault protection is available?
A: It includes Undervoltage protection.
Q: What is the operating temperature range?
A: It operates from -20°C to 85°C (junction temperature).
Base Product Number : LTC4126EV-ADJ
12-VFQFN 4.2V 50mA Battery Charger Lithium Ion Low Current Charger LTC4126 Undervoltage Protection
Q: What battery chemistry does this charger support?
A: It is designed for Lithium Ion batteries.
Q: How many cells can it charge?
A: It supports a single-cell (1) configuration.
Q: What is the maximum charge current?
A: The maximum charge current is 50mA.
Q: What is the battery voltage?
A: The battery voltage is 4.2V.
Q: What fault protection is available?
A: It includes Undervoltage protection.
Q: What is the operating temperature range?
A: It operates from -20°C to 85°C (junction temperature).