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MAX1535, MAX1535B, MAX1535C, MAX1535D

Highly Integrated Level 2 SMBus Battery Chargers

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Compliant with Level 2 Smart-Battery-Charger Specifications Rev 1.1
  • Intel SMBus 2-Wire Serial Interface
  • ±0.5% Charge-Voltage Accuracy
  • 11-Bit Charge-Voltage Resolution
  • ±3% Input Current-Limit Accuracy
  • Use Small (10mΩ) Current-Sense Resistors
  • 8A Maximum Charge Current
  • 6-Bit Input and Charge-Current Resolution
  • 8V to 28V Input Voltage Range
  • 175s Charge Safety Timer
  • Automatic Selection of System Power Source
  • Charge Any Battery Chemistry (Li+, NiCd, NiMH, Lead Acid, etc.)

Applications/Uses

  • Notebook and Subnotebook Computers
  • Portable Equipment with Rechargeable Batteries
  • Tablet PCs

Description

The MAX1535B/MAX1535C/MAX1535D are highly integrated, multichemistry battery chargers that simplify construction of advanced smart chargers with a minimum number of external components. They use Intel's system management bus (SMBus™) to control the charge voltage, charge current, and the maximum current drawn from the AC adapter. High efficiency is achieved through use of a constant off-time step-down topology with synchronous rectification.

In addition to support of the Smart-Battery-Charger Specifications Rev 1.1, the MAX1535B/MAX1535C/MAX1535D include additional features. The maximum current drawn from the AC adapter is programmable to avoid overloads when supplying the load and the battery charger simultaneously. This enables the user to reduce the cost of the AC adapter. The MAX1535B/MAX1535C/MAX1535D provide a digital output that indicates the presence of an AC adapter. Based on the presence or absence of the AC adapter, the MAX1535B/MAX1535C/MAX1535D automatically select the appropriate source for supplying power to the system by controlling two external p-channel MOSFETs. Under system control, the MAX1535B/MAX1535C/MAX1535D allow the battery to undergo a relearning or conditioning cycle in which the battery is completely discharged through the system load and then recharged.

The MAX1535B/MAX1535C/MAX1535D are capable of charging 2, 3, or 4 lithium-ion (Li+) cells in series, providing charge currents as high as 8A. The DC-DC converter in the MAX1535B/MAX1535C/MAX1535D uses a high-side p-channel switch with an n-channel synchronous rectifier. The charge current and input current-limit sense amplifiers have low input-offset errors and can use small-value sense resistors (0.01Ω, typ).

The MAX1535B/MAX1535C/MAX1535D are available in a 5mm x 5mm, 32-pin, thin QFN package and operate over the extended -40°C to +85°C temperature range. An evaluation kit is available to reduce design time.

Simplified Block Diagram

MAX1535B, MAX1535C, MAX1535D: Pin Configuration MAX1535B, MAX1535C, MAX1535D: Pin Configuration 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.