LT1512

PRODUCTION

LT1512

SEPIC Constant-Current/Constant-Voltage Battery Charger

PRODUCTION

Figure 1. SEPIC Charger with 0.5A Output Current slide

Figure 1. SEPIC Charger with 0.5A Output Current

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Part Models 10

1ku List Price Starting From $4.43

Features

Charger Input Voltage May Be Higher, Equal to or Lower Than Battery Voltage
Charges Any Number of Cells Up to 30V*
1% Voltage Accuracy for Rechargeable Lithium Batteries
500kHz Switching Frequency Minimizes Inductor Size
100mV Current Sense Voltage for High Efficiency
Battery Can Be Directly Grounded
Charging Current Easily Programmable or Shut Down

*Maximum Input Voltage = 40V – V_BAT

Additional Details

The LT1512 is a 500kHz current mode switching regulator specially configured to create a constant-current/constant-voltage battery charger. In addition to the usual voltage feedback node, it has a current sense feedback circuit for accurately controlling output current of a flyback or SEPIC (Single-Ended Primary Inductance Converter) topology charger. These topologies allow the current sense circuit to be ground referred and completely separated from the battery itself, simplifying battery switching and system grounding problems. In addition, these topologies allow charging even when the input voltage is lower than the battery voltage.

Maximum switch current on the LT1512 is 1.5A. This allows battery charging currents up to 1A for a single lithium-ion cell. Accuracy of 1% in constant-voltage mode is perfect for lithium battery applications. Charging current can be easily programmed for all battery types.

Applications

Battery Charging of NiCd, NiMH, Lead-Acid or Lithium Rechargeable Cells
Precision Current Limited Power Supply
Constant-Voltage/Constant-Current Supply
Transducer Excitation

*Maximum Input Voltage = 40V – V_BAT

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 10

1ku List Price Starting From $4.43

Technical Documents 7

LT1512: SEPIC Constant-Current/Constant-Voltage Battery Charger Data Sheet 03/09/2015

R324 Reliability Data 03/26/2018

AN84 - Linear Technology Magazine Circuit Collection, Volume IV 08/20/2007

Reverse Voltage Protection for Battery Chargers 06/01/2020

Design Note 242: Li-Ion Charge Termination IC Interfaces with PWM Switchers 01/01/2000

Low Voltage PowerPath Driver Switches from a 3.3V or 5V Supply to Battery Backup 06/01/1999

LT1512 - SPECIFICATION NOTICE 11/22/2004

Reference Materials 1

Industrial Battery Chargers Overview 10/17/2023

Design Resources 10

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT1512CGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512CGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512CN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512IGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512IGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512IN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1512IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT1512CGN#PBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512CGN#TRPBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512CN8#PBF
Pin/Package Drawing
8-Lead PDIP (Narrow 0.3 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512CS8#PBF
Pin/Package Drawing
8-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512CS8#TRPBF
Pin/Package Drawing
8-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512IGN#PBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512IGN#TRPBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512IN8#PBF
Pin/Package Drawing
8-Lead PDIP (Narrow 0.3 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512IS8#PBF
Pin/Package Drawing
8-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1512IS8#TRPBF
Pin/Package Drawing
8-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 3, 2024

- 24_0235

(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LT1512CGN#PBF

PRODUCTION

LT1512CGN#TRPBF

PRODUCTION

LT1512IGN#PBF

PRODUCTION

LT1512IGN#TRPBF

PRODUCTION

pdf

PCN24_0235_Form

xls

Material_Report

pdf

Other

xlsm

Delta Qualification Matrix

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LT1512CGN#PBF

PRODUCTION

LT1512CGN#TRPBF

PRODUCTION

LT1512IGN#PBF

PRODUCTION

LT1512IGN#TRPBF

PRODUCTION

pdf

PCN22_0235_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LT1512CGN#PBF

PRODUCTION

LT1512CGN#TRPBF

PRODUCTION

LT1512IGN#PBF

PRODUCTION

LT1512IGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Oct 8, 2024

- 24_0234

Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package

LT1512CN8#PBF

PRODUCTION

LT1512IN8#PBF

PRODUCTION

pdf

PCN24_0234_Form

xls

Material_Report

pdf

Marking Comparison

Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1512CN8#PBF

PRODUCTION

LT1512IN8#PBF

PRODUCTION

pdf

PCN22_0241_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0172

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1512CN8#PBF

PRODUCTION

LT1512IN8#PBF

PRODUCTION

pdf

PCN22_0172_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Dec 14, 2023

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1512CS8#PBF

PRODUCTION

LT1512CS8#TRPBF

PRODUCTION

LT1512IS8#PBF

PRODUCTION

LT1512IS8#TRPBF

PRODUCTION

pdf

PCN22_0255_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Jun 11, 2021

- 21_0060

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1512CS8#PBF

PRODUCTION

LT1512CS8#TRPBF

PRODUCTION

LT1512IS8#PBF

PRODUCTION

LT1512IS8#TRPBF

PRODUCTION

pdf

PCN21_0060_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 3, 2024

- 24_0235

(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LT1512CGN#PBF

PRODUCTION

LT1512CGN#TRPBF

PRODUCTION

LT1512IGN#PBF

PRODUCTION

LT1512IGN#TRPBF

PRODUCTION

pdf

PCN24_0235_Form

xls

Material_Report

pdf

Other

xlsm

Delta Qualification Matrix

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LT1512CGN#PBF

PRODUCTION

LT1512CGN#TRPBF

PRODUCTION

LT1512IGN#PBF

PRODUCTION

LT1512IGN#TRPBF

PRODUCTION

pdf

PCN22_0235_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LT1512CGN#PBF

PRODUCTION

LT1512CGN#TRPBF

PRODUCTION

LT1512IGN#PBF

PRODUCTION

LT1512IGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Oct 8, 2024

- 24_0234

Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package

LT1512CN8#PBF

PRODUCTION

LT1512IN8#PBF

PRODUCTION

pdf

PCN24_0234_Form

xls

Material_Report

pdf

Marking Comparison

Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1512CN8#PBF

PRODUCTION

LT1512IN8#PBF

PRODUCTION

pdf

PCN22_0241_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0172

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1512CN8#PBF

PRODUCTION

LT1512IN8#PBF

PRODUCTION

pdf

PCN22_0172_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Dec 14, 2023

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1512CS8#PBF

PRODUCTION

LT1512CS8#TRPBF

PRODUCTION

LT1512IS8#PBF

PRODUCTION

LT1512IS8#TRPBF

PRODUCTION

pdf

PCN22_0255_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Jun 11, 2021

- 21_0060

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1512CS8#PBF

PRODUCTION

LT1512CS8#TRPBF

PRODUCTION

LT1512IS8#PBF

PRODUCTION

LT1512IS8#TRPBF

PRODUCTION

pdf

PCN21_0060_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Companion Parts 3

Parts	Product Life Cycle	Description
µModule Battery Chargers1
LTM8062	RECOMMENDED FOR NEW DESIGNS	32V_IN, 2A μModule (Power Module) Power Tracking Battery Charger
Pushbutton Controllers1
LTC2956	RECOMMENDED FOR NEW DESIGNS	Wake-Up Timer with Pushbutton Control
Switching Battery Chargers1
LTC4020	RECOMMENDED FOR NEW DESIGNS	55V Buck-Boost Multi-Chemistry Battery Charger

Alternative Parts 1

Parts	Product Life Cycle	Description
LTC4020	RECOMMENDED FOR NEW DESIGNS	55V Buck-Boost Multi-Chemistry Battery Charger

LTspice 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, 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.