Power Management Battery Management Battery Charger IC Linear Battery Chargers

LTC4056-4.2 - Linear Li-Ion Charger with Termination in ThinSOT

Features

  • Standalone Li-Ion Charger with Termination
  • Programmable Termination Timer
  • No Sense Resistor or Blocking Diode Required
  • Suitable for USB-Powered Charging
  • Undervoltage Charge Current Limiting
  • Preset Charge Voltage with ±0.6% Accuracy
  • Programmable Charge Current: 200mA to 700mA
  • Automatic Recharge with Shortened Charge Cycle
  • Self-Protection for Overcurrent/Overtemperature
  • 40µA Supply Current in Shutdown Mode
  • Negligible Battery Drain Current in Shutdown
  • Low Battery Charge Conditioning (Trickle Charging)
  • CHRG Status Output including AC Present
  • PCB Total Solution Area only 75mm² (700mA)
  • Low Profile (1mm) SOT-23 Package

Typical Application

LTC4056-4.2 Typical Application
LTC4056-4.2 Typical Application

Description

The LTC®4056 is a low cost, single-cell, constant-current/ constant-voltage Li-Ion battery charger controller with a programmable termination timer. When combined with a few external components, the LTC4056 forms a very small standalone charger for single cell lithium-ion batteries.

Charge current and charge time are set externally with a single resistor and capacitor, respectively. The LTC4056 charges to a final float voltage accurate to ±0.6%. Manual shutdown is accomplished by grounding the TIMER/ SHDN pin, while removing input power automatically puts the LTC4056 into a sleep mode. Both the shutdown and sleep modes drain near zero current from the battery; the shutdown mode reduces supply current to 40µA.

The output driver is both current limited and thermally protected to prevent operating outside of safe limits. No external blocking diode or sense resistor is required. The LTC4056 also includes low battery charge conditioning (trickle charging), undervoltage charge current limiting, automatic recharge and a charge status output.

The LTC4056 is available in a low profile (1mm) 8-lead SOT-23 (ThinSOT™) 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
LTC4056ETS8-4.2#PBF SOT-23 TS8 E 05-08-1637 Yes
LTC4056ETS8-4.2#TRMPBF SOT-23 TS8 E 05-08-1637 Yes
LTC4056ETS8-4.2#TRPBF SOT-23 TS8 E 05-08-1637 Yes


LTC4056-4.2 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
LTC4056ETS8-4.2#PBF SOT-23 E $2.14 Yes
LTC4056ETS8-4.2#TRMPBF SOT-23 E $2.14 $1.43 Yes
LTC4056ETS8-4.2#TRPBF SOT-23 E $2.14 $1.41 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
DC606A LTC4056ETS8-4.2 | Li-Ion Charger with Termination, 4.25 to 6.5Vin, Jumper selectable, 450mA or 700mA $75.00
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Click here to view our complete list of demo boards

Applications

  • Cellular Telephones
  • Handheld Computers
  • Digital Cameras
  • Charging Docks and Cradles
  • Low Cost and Small Size Chargers

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