LT1505

PRODUCTION

Constant-Current/Voltage High Efficiency Battery Charger

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Overview

  • Simple Charging of Li-Ion, NiMH and NiCd Batteries
  • Very High Efficiency: Up to 97%
  • Precision 0.5% Charging Voltage Accuracy
  • Preset Battery Voltages: 12.3V, 12.6V, 16.4V and 16.8V
  • 5% Charging Current Accuracy
  • Charging Current Programmed by Resistor or DAC
  • 0.5V Dropout Voltage, Duty Cycle > 99.5%
  • AC Adapter Current Limit* Maximizes Charging Rate
  • Flag Indicates Li-Ion Charge Completion
  • Auto Shutdown with Adapter Removal
  • Only 10µA Battery Drain When Idle
  • Synchronizable Up to 280kHz

The LT1505 PWM battery charger controller fast charges multiple battery chemistries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) using constant-current or constant-voltage control. Maximum current can be easily programmed by resistors or a DAC. The constant-voltage output can be selected for 3 or 4 series Li-Ion cells with 0.5% accuracy.

A third control loop limits the current drawn from the AC adapter during charging*. This allows simultaneous operation of the equipment and fast battery charging without overloading the AC adapter.

The LT1505 can charge batteries ranging from 2.5V to 20V with dropout voltage as low as 0.5V. Synchronous N-channel FETs switching at 200kHz give high efficiency and allow small inductor size. A diode is not required in series with the battery because the charger automatically enters a 10µA sleep mode when the wall adapter is unplugged. A logic output indicates Li-Ion full charge when current drops to 20% of the programmed value.

The LT1505 is available in a 28-pin SSOP package.

Applications

  • Notebook Computers
  • Portable Instruments
  • Chargers for Li-Ion, NiMH, NiCd and Lead Acid Rechargeable Batteries
LT1505
Constant-Current/Voltage High Efficiency Battery Charger
Figure 1. Low Dropout 4A Lithium-Ion Battery Charger Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 1

Design Note 3

Technical Articles 1

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 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
LTC2954
RECOMMENDED FOR NEW DESIGNS Push Button On/Off Controller with µP Interrupt
LTC4364
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT1505
  • LT1505-1
LTspice

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.

Evaluation Kits

eval board
schematic 1
DC219A

LT1505CG | 4A CC-CV Lithium-Ion Battery Charger, VIN max < 24V, VIN min = Vbat +0.5V (thru-hole caps)

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Product Details

DC219A: Demo Board for the LT1505 Constant-Current/Voltage High Efficiency Battery Charger.


 
DC219A
LT1505CG | 4A CC-CV Lithium-Ion Battery Charger, VIN max < 24V, VIN min = Vbat +0.5V (thru-hole caps)
DC219A - Schematic

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