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Low-Cost Multichemistry Battery Chargers

Low-Cost, Highly Integrated, Multichemistry Battery-Charger Control ICs Simplify the Construction of Accurate and Efficient Chargers

Product Details

Key Features

Applications/Uses

Parametric specs for Battery Chargers
Charging VIN (V) (max) 28
Max. ICHG (A) 5
Cell Chemistry Lead Acid
Li-Ion
Li-Polymer
NiCd
NiMH
Universal
# NiMH/ NiCd Cells 2
3
4
5
6
7
8
9
10
# Lithium Ion Cells 2
3
4
Protected VIN (V) (max) 28
Charger (V) 0 to 17.6
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/28
Budgetary
Price (See Notes)
3.72
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 28
Max. ICHG (A) 5
Cell Chemistry Lead Acid
Li-Ion
Li-Polymer
NiCd
NiMH
Universal
# NiMH/ NiCd Cells 2
3
4
5
6
7
8
9
10
# Lithium Ion Cells 2
3
4
Protected VIN (V) (max) 28
Charger (V) 0 to 17.6
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/28
Budgetary
Price (See Notes)
3.72

Key Features

  • ±0.5% Output Voltage Accuracy Using Internal Reference (±0.4% for MAX8765A, 2-/3-Cell Only)
  • ±4% Accurate Input Current Limiting
  • ±5% Accurate Charge Current
  • Analog Inputs Control Charge Current and Charge Voltage
  • Outputs for Monitoring
    • Current Drawn from AC Adapter
    • Charging Current
    • AC Adapter Presence
  • Up to 17.6V Battery-Voltage Set Point
  • Maximum 28V Input Voltage
  • > 95% Efficiency
  • Shutdown Control Input
  • Charge Any Battery Chemistry
    • Li+, NiCd, NiMH, Lead Acid, etc.

Applications/Uses

  • Handheld Terminals
  • Notebook and Subnotebook Computers
  • Personal Digital Assistants (PDAs)

Description

The MAX1908/MAX8724/MAX8765/MAX8765A highly integrated, multichemistry battery-charger control ICs simplify the construction of accurate and efficient chargers. These devices use analog inputs to control charge current and voltage, and can be programmed by the host or hardwired. The MAX1908/MAX8724/MAX8765/MAX8765A achieve high efficiency using a buck topology with synchronous rectification.

The MAX1908/MAX8724/MAX8765/MAX8765A feature input current limiting. This feature reduces battery charge current when the input current limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. The MAX1908/MAX8724/MAX8765/MAX8765A provide outputs to monitor current drawn from the AC adapter (DC input source), battery-charging current, and the presence of an AC adapter. The MAX1908's conditioning charge feature provides 300mA to safely charge deeply discharged lithium-ion (Li+) battery packs.

The MAX1908 includes a conditioning charge feature while the MAX8724/MAX8765/MAX8765A do not.

The MAX1908/MAX8724/MAX8765/MAX8765A charge two to four series Li+ cells, providing more than 5A, and are available in a space-saving, 28-pin, thin QFN package (5mm x 5mm). An evaluation kit is available to speed designs.

Simplified Block Diagram

MAX1908, MAX8724, MAX8765: Functional Diagram MAX1908, MAX8724, MAX8765: Functional Diagram 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 .