LTC4009
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LTC4009

High Efficiency, Multi-Chemistry Battery Charger

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Part Details
Part Models 12
1ku List Price Starting From $3.54
Features
  • General Purpose Battery Charger Controller
  • Efficient 550kHz Synchronous Buck PWM Topology
  • ±0.5% Output Float Voltage Accuracy
  • Programmable Charge Current: 4% Accuracy
  • Programmable AC Adapter Current Limit: 3% Accuracy
  • No Audible Noise with Ceramic Capacitors
  • Wide Input Voltage Range: 6V to 28V
  • Wide Output Voltage Range: 2V to 28V
  • Indicator Outputs for AC Adapter Present, Charging, C/10 Current Detection and Input Current Limiting
  • Analog Charge Current Monitor
  • Micropower Shutdown
  • Thermally Enhanced 20-Pin 4mm × 4mm × 0.75mm QFN Package
Additional Details
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The LTC4009 is a constant-current/constant-voltage battery charger controller. It uses a synchronous quasiconstant frequency PWM control architecture that will not generate audible noise with ceramic bulk capacitors. Charge current is set by the combination of external sense, input and programming resistors. With no built-in termination, the LTC4009 family charges a wide range of batteries under external control.

The LTC4009 features a fully adjustable output voltage, while the LTC4009-1 and LTC4009-2 can be pin-programmed for lithium-ion/polymer battery packs of 1-, 2-, 3- or 4-series cells. The LTC4009-1 provides output voltage of 4.1V/cell, and the LTC4009-2 is a 4.2V/cell version.

The device includes AC adapter input current limiting which maximizes the charge rate for a fixed input power level. An external sense resistor programs the input current limit, and the ICL status pin indicates when the battery charge current is being reduced as a result of AC adapter current limiting.

The CHRG status pin is active during all charging modes, including special indication for low charge current.

Applications

  • Notebook Computers
  • Portable Instruments
  • Battery Backup Systems
Part Models 12
1ku List Price Starting From $3.54

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1104B

LTC4009-2 Multicell Li-Ion Battery Charger Board

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DC1104B

LTC4009-2 Multicell Li-Ion Battery Charger Board

LTC4009-2 Multicell Li-Ion Battery Charger Board

Product Detail

Demonstration circuit 1104B is a single-battery standalone charge controller with built-in charge termination featuring the LTC4009-2. The input voltage is 13.5V to 20V. The charger output voltage is programmed by jumpers to support 1-, 2-, 3- and 4-cell Li-Ion batteries with a cell voltage of 4.2V/cell. The maximum charge current is 2A. The demo board is initially configured for 12.6V Li-Ion batteries. The board will automatically charge a battery as soon as input power is applied with a battery connected prior to power up. Status LEDs are provided for CHG, ACP, C/10, and ICL although this charger is not a smart battery charger, a popular smart battery connector is provided that can be used for data-logging with the optional DC410 demo board and software. To be clear, you do not need a smart battery to use this board. The optional DC410 SMBus-to-Serial port adapter and associated software is to monitor a smart battery for demonstration purposes only. Contact your Analog Devices representative for ordering a DC410. This demo board is capable of supporting the LTC4009 and LTC4009-1 with a simple IC swap out. See schematic.


 

 

Tools & Simulations

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LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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