LT3652 - Power Tracking 2A Battery Charger for Solar Power

Features

  • Input Supply Voltage Regulation Loop for Peak Power Tracking in (MPPT) Solar Applications
  • Wide Input Voltage Range: 4.95V to 32V (40V Abs Max)
  • Programmable Charge Rate Up to 2A
  • User Selectable Termination: C/10 or On-Board Termination Timer
  • Resistor Programmable Float Voltage Up to 14.4V Accommodates Li-Ion/Polymer, LiFePO4, SLA Chemistries
  • No VIN Blocking Diode Required for Battery Voltages ≤ 4.2V
  • 1MHz Fixed Frequency
  • 0.5% Float Voltage Reference Accuracy
  • 5% Charge Current Accuracy
  • 2.5% C/10 Detection Accuracy
  • Binary-Coded Open-Collector Status Pins
  • Thermally Enhanced 12-Lead 3mm × 3mm DFN and
    MSE Packages
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT3652 Typical Application
LT3652 Typical Application

Description

The LT®3652 is a complete monolithic step-down battery charger that operates over a 4.95V to 32V input voltage range. The LT3652 provides a constant-current/ constant-voltage charge characteristic, with maximum charge current externally programmable up to 2A. The charger employs a 3.3V float voltage feedback reference, so any desired battery float voltage up to 14.4V can be programmed with a resistor divider.

The LT3652 employs an input voltage regulation loop, which reduces charge current if the input voltage falls below a programmed level, set with a resistor divider. When the LT3652 is powered by a solar panel, the input regulation loop is used to maintain the panel at peak output power.

The LT3652 can be configured to terminate charging when charge current falls below 1/10 of the programmed maximum (C/10). Once charging is terminated, the LT3652 enters a low-current (85μA) standby mode. An auto-recharge feature starts a new charging cycle if the battery voltage falls 2.5% below the programmed float voltage. The LT3652 also contains a programmable safety timer, used to terminate charging after a desired time is reached. This allows top-off charging at currents less than C/10.

 Vin MaxVfloat MaxFeatures
LT3652 32V 14.4V internal reverse blocking
Vbat<4.2V
LT3652HV 34V 18V  

Packaging

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

Part Number Package Code Temp Package
Drawing
RoHS
LT3652EDD#PBF 3x3 DFN-12 DD E 05-08-1725 Yes
LT3652EDD#TRPBF 3x3 DFN-12 DD E 05-08-1725 Yes
LT3652EMSE#PBF MS-12E MSE E 05-08-1666 Yes
LT3652EMSE#TRPBF MS-12E MSE E 05-08-1666 Yes
LT3652IDD#PBF 3x3 DFN-12 DD I 05-08-1725 Yes
LT3652IDD#TRPBF 3x3 DFN-12 DD I 05-08-1725 Yes
LT3652IMSE#PBF MS-12E MSE I 05-08-1666 Yes
LT3652IMSE#TRPBF MS-12E MSE I 05-08-1666 Yes


LT3652 Package Drawing
LT3652 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
LT3652EDD#PBF 3x3 DFN-12 E $4.36 $3.05 Yes
LT3652EDD#TRPBF 3x3 DFN-12 E $3.11 Yes
LT3652EMSE#PBF MS-12E E $4.36 $3.05 Yes
LT3652EMSE#TRPBF MS-12E E $3.11 Yes
LT3652IDD#PBF 3x3 DFN-12 I $4.80 $3.36 Yes
LT3652IDD#TRPBF 3x3 DFN-12 I $3.42 Yes
LT3652IMSE#PBF MS-12E I $4.80 $3.36 Yes
LT3652IMSE#TRPBF MS-12E I $3.42 Yes
Buy NowRequest Samples
* 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
DC1568A LT3652EDD Demo Board | 11.5V to 32VIN, 2A Buck Battery Charger, MPPC for Solar Power Input $150.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Appications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3652IDD#PBF 3x3 DFN-12 I $4.80 $3.36 Yes
LT3652IDD#TRPBF 3x3 DFN-12 I $3.42 Yes
LT3652IMSE#PBF MS-12E I $4.80 $3.36 Yes
LT3652IMSE#TRPBF MS-12E I $3.42 Yes
Buy NowRequest Samples
* 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.

Applications

  • Solar Powered Applications
  • Remote Monitoring Stations
  • LiFePO4 (Lithium Phosphate) Applications
  • Portable Handheld Instruments
  • 12V to 24V Automotive Systems

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Design Tools

LTspiceIV

LTspice® IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LT3652
LT3652HV

Technical Support