LTC1980 - Combination Battery Charger and DC/DC Converter

Features

  • Single Controller IC Includes Battery Charger Plus DC/DC Converter
  • Wall Adapter Voltage May be Above or Below Battery Voltage
  • LDO Controller Allows Simultaneous Charging and Regulating from Wall Adapter Input
  • Standalone Li-Ion Battery Charger Including Charge Termination, Overvoltage Protection, Shorted-Cell Detection and Battery Recharge
  • Selectable 4.1V, 4.2V, 8.2V and 8.4V Float Voltages
  • Simple NiMH and NiCd Battery Charger
  • Pin Programmable Regulator Burst Mode® Operation and Shutdown for High Efficiency
  • High Efficiency Current Mode 300kHz PWM
  • Reduced Component Architecture
  • Undervoltage Protection and Soft-Start Insures Start-Up with Current Limited Wall Adapter
  • Small 24-Pin SSOP Package

Typical Application

LTC1980 Typical Application
LTC1980 Typical Application

Description

The LTC®1980 integrates PWM power control for charging a battery and converting the battery voltage to a regulated output or simultaneously charging the battery while powering a system load from an unregulated AC wall adapter. Combining these features into a single IC produces a smaller area and lower cost solution compared to presently available multi-IC solutions. The LTC1980 shares the discrete components for both the battery charger and the DC/DC converter thus minimizing size and cost relative to dual controller solutions. Both the battery charger and DC/DC converter use a current mode flyback topology for high efficiency and excellent transient response. Optional Burst Mode operation and power-down mode allow power density, efficiency and output ripple to be tailored to the application.

The LTC1980 provides a complete Li-Ion battery charger with charge termination timer, preset Li-Ion battery voltages, overvoltage and undervoltage protection, and userprogrammable constant-current charging. Automatic battery recharging, shorted-cell detection, and open-drain C/10 and wall plug detect outputs are also provided. User programming allows NiMH and NiCd battery chemistries to be charged as well.

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
LTC1980EGN#PBF SSOP-24 GN E 05-08-1641 (GN24) Yes
LTC1980EGN#TRPBF SSOP-24 GN E 05-08-1641 (GN24) Yes


LTC1980 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
LTC1980EGN#PBF SSOP-24 E $5.36 $3.75 Yes
LTC1980EGN#TRPBF SSOP-24 E $3.85 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
DC532A LTC1980EGN | Regulator / Battery Charger Controller, Vin = 4V - 6.5V, Vout = 3.3V @ 400mA, BATout 1A Imax $175.00
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Click here to view our complete list of demo boards

Applications

  • Digital Cameras
  • Handheld Computers
  • Personal Digital Assistants
  • 1W to 10W Uninterruptable Power Supplies

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support