LT1513

PRODUCTION

SEPIC Constant- or Programmable-Current/Constant-Voltage Battery Charger

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Overview

  • Charger Input Voltage May Be Higher, Equal to or Lower Than Battery Voltage
  • Charges Any Number of Cells Up to 20V
  • 1% Voltage Accuracy for Rechargeable Lithium Batteries
  • 100mV Current Sense Voltage for High Efficiency (LT1513)
  • 0mV Current Sense Voltage for Easy Current Programming (LT1513-2)
  • Battery Can Be Directly Grounded
  • 500kHz Switching Frequency Minimizes Inductor Size
  • Charging Current Easily Programmable or Shut Down

The LT1513 is a 500kHz current mode switching regulator specially configured to create a constant- or programmable-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. The LT1513 can also drive a CCFL Royer converter with high efficiency in floating or grounded mode.

Maximum switch current on the LT1513 is 3A. This allows battery charging currents up to 2A 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

  • Charging of NiCd, NiMH, Lead-Acid or Lithium Rechargeable Cells
  • Precision Current Limited Power Supply
  • Constant-Voltage/Constant-Current Supply
  • Transducer Excitation
  • Universal Input CCFL Driver
LT1513
SEPIC Constant- or Programmable-Current/Constant-Voltage Battery Charger
SEPIC Charger with 1.25A Output Current Maximum Charging Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 3

Design Note 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Battery Charger ICs 1
LTC4020
RECOMMENDED FOR NEW DESIGNS 55V Buck-Boost Multi-Chemistry Battery Charger
Battery Monitors & Fuel Gauges 1
LTC2942-1
Obsolete 1A Battery Gas Gauge with Internal Sense Resistor and Temperature/Voltage Measurement
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Protection Switches & Controllers 2
LTC4365
RECOMMENDED FOR NEW DESIGNS Overvoltage, Undervoltage and Reverse Supply Protection Controller
LTC2955
RECOMMENDED FOR NEW DESIGNS Pushbutton On/Off Controller with Automatic Turn-On
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT1513
  • LT1513-2
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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.

Latest Discussions

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