Power Management Battery Management Battery Charger IC Linear Battery Chargers

LTC2955 - Pushbutton On/Off Controller with Automatic Turn-On

LTC2960 - 36V Nano-Current Two-Input Voltage Monitor

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

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

LTC4050 Typical Application
LTC4050 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC4050EMS-4.1#PBF MS-10 MS E 05-08-1661 Yes
LTC4050EMS-4.1#TRPBF MS-10 MS E 05-08-1661 Yes
LTC4050EMS-4.2#PBF MS-10 MS E 05-08-1661 Yes
LTC4050EMS-4.2#TRPBF MS-10 MS E 05-08-1661 Yes


LTC4050 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC4050EMS-4.1#PBF MS-10 E $2.66 $2.25 Yes
LTC4050EMS-4.1#TRPBF MS-10 E $2.31 Yes
LTC4050EMS-4.2#PBF MS-10 E $2.66 $2.25 Yes
LTC4050EMS-4.2#TRPBF MS-10 E $2.31 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC530A-A LTC4050EMS-4.1 | Li-Ion Battery Charger with NTC, Vin = 4.5V-6V, Vbat = 4.1V, Ibat = 700mA Contact Factory
DC530A-B LTC4050EMS-4.2 | Li-Ion Battery Charger with NTC, Vin = 4.5V-6V, Vbat = 4.2V, Ibat = 700mA Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Cellular Phones
  • Handheld Computers
  • Charging Docks and Cradles

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