LTC4050 - Lithium-Ion Linear Battery Charger Controller with Thermistor Interface

The LTC®4050-4.1/LTC4050-4.2 are complete standalone constant-current/constant-voltage linear charge controllers for lithium-ion (Li-Ion) batteries. Charge current is programmable and final float voltage has ±1% accuracy.

When the input supply is removed, the LTC4050 automatically enters a low quiescent current sleep mode, dropping the battery drain current to 5µA. An internal comparator detects the near-end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until cell voltage exceeds 2.49V. The thermistor interface suspends charging if the cell temperature is outside of a 0°C to 50°C temperature window.

The LTC4050 begins a new charge cycle when a discharged battery is connected to the charger or when the input power is applied. In addition, a new charge cycle is automatically started if the battery remains connected to the charger and the cell voltage drops below 3.88V for 4.1V cells or below 3.98V for 4.2V cells.

The LTC4050 is available in the 10-pin MSOP package.

Features
  • Complete Stand-Alone Linear Charger Controller for 1-Cell Lithium-Ion Batteries
  • Thermistor Interface for Battery Temperature Sensing
  • Preset Charge Voltage with ±1% Accuracy
  • Programmable Charge Current
  • C/10 Charge Current Detection Output
  • Programmable Charge Termination Timer
  • Input Supply (Wall Adapter) Detection Output
  • 4.5V to 10V Input Voltage Range
  • Automatic Sleep Mode When Input Supply is Removed (Only 5µA Battery Drain)
  • Automatic Trickle Charging of Low Voltage Cells
  • Automatic Battery Recharge
  • Battery Insertion Detection
  • Space Saving 10-Pin MSOP Package
Typical Application

Applications
  • Cellular Phones
  • Handheld Computers
  • Charging Docks and Cradles
Packaging
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC4050EMS-4.1#PBFMS-10E$2.66$2.25
LTC4050EMS-4.1#TRPBFMS-10E$2.31
LTC4050EMS-4.2#PBFMS-10E$2.66$2.25
LTC4050EMS-4.2#TRPBFMS-10E$2.31
Demo Boards
Part NumberDescriptionPrice
DC530A-ALTC4050EMS-4.1 | Li-Ion Battery Charger with NTC, Vin = 4.5V-6V, Vbat = 4.1V, Ibat = 700mAContact Factory
DC530A-BLTC4050EMS-4.2 | Li-Ion Battery Charger with NTC, Vin = 4.5V-6V, Vbat = 4.2V, Ibat = 700mAContact Factory
Datasheet
Reliability Data
Related Product
LTC4050 - Lithium-Ion Linear Battery Charger Controller with Thermistor Interface
R449 Reliability Data
LTC4050 Footprints and Symbols