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Advanced-Chemistry-Independent, Level-2 Battery Chargers with Input Current Limiting

SMBus™ Controlled, Chemistry Independent Smart Battery Charger with Input Current Limiting and Safety Timer

Product Details

Key Features

Parametric specs for Battery Chargers
Charging VIN (V) (max) 28
Max. ICHG (A) 3
Cell Chemistry Lead Acid
Li-Ion
Li-Polymer
NiCd
NiMH
Universal
# NiMH/ NiCd Cells 1
2
3
4
5
6
7
8
# Lithium Ion Cells 2
3
4
Protected VIN (V) (max) 28
Charger (V) 1 to 18.4
Oper. Temp. (°C) -40 to +85
Package/Pins See Data Sheet
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Simplified Block Diagram

Technical Docs

Support & Training

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Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 28
Max. ICHG (A) 3
Cell Chemistry Lead Acid
Li-Ion
Li-Polymer
NiCd
NiMH
Universal
# NiMH/ NiCd Cells 1
2
3
4
5
6
7
8
# Lithium Ion Cells 2
3
4
Protected VIN (V) (max) 28
Charger (V) 1 to 18.4
Oper. Temp. (°C) -40 to +85
Package/Pins See Data Sheet

Key Features

  • Input Current Limiting
  • 175sec Charge Safety Timeout
  • 128mA Wake-Up Charge
  • Charges Any Chemistry Battery: Li+, NiCd, NiMH, Lead Acid, etc.
  • Intel SMBus 2-Wire Serial Interface
  • Compliant with Level 2 Smart Battery Charger Spec. Rev. 1.0
  • +8V to +28V Input Voltage Range
  • Up to 18.4V Battery Voltage
  • 11-Bit Battery Voltage Setting
  • ±0.8% Output Voltage Accuracy with Internal Reference
  • 3A max Battery Charge Current
  • 6-Bit Charge Current Setting
  • 99.99% max Duty Cycle for Low-Dropout Operation
  • Load/Source Switchover Drivers
  • >97% Efficiency

Applications/Uses

  • Notebook Computers
  • PDAs and Other Handheld Devices
  • Point-of-Sale Terminals

Description

The MAX1645 is a high-efficiency battery charger capable of charging batteries of any chemistry type. It uses the Intel® System Management Bus (SMBus™) to control voltage and current charge outputs.

When charging lithium-ion (Li+) batteries, the MAX1645 automatically transitions from regulating current to regulating voltage. The MAX1645 can also limit line input current so as not to exceed a predetermined current drawn from the DC source. A 175sec charge safety timer prevents "runaway charging" should the MAX1645 stop receiving charging voltage/current commands.

The MAX1645 employs a next-generation synchronous buck control circuitry that lowers the minimum input-to-output voltage drop by allowing the duty cycle to exceed 99%. The MAX1645 can easily charge one to four series Li+ cells.

Simplified Block Diagram

MAX1645, MAX1645A: Typical Operating Circuit MAX1645, MAX1645A: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.