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  5. Linear Battery Chargers
  6. MAX8934G

Data Sheet Rev. 0
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Overview

Features and Benefits

  • Li+ Charger with Smart Power Selector, No External MOSFETs Needed
  • Monitors Battery Temperature and Adjusts Charge Current and Termination Voltage Automatically per JEITA Recommendations
  • Active-Low OT Flags System of a Hot Battery During Discharge
  • Ultra-Low IQ, Always-On 3.3V LDO
  • Common or Separate USB and Adapter Inputs
  • Automatic Adapter/USB/Battery Switchover
  • Load Peaks in Excess of Adapter Rating are Supported by Battery
  • Input OVP to 16V (DC) and 9V (USB)
  • 40mΩ SYS-to-BATT Switch
  • Thermal Regulation Prevents Overheating
  • 4.35V SYS Regulation Voltage

Product Details

The MAX8934G dual-input Li+/Li-Poly linear battery charger with Smart Power Selector™ safely charges a single Li+/Li-Poly cell in accordance with JEITA* recommendations. The MAX8934G monitors the battery temperature (TBATT) while charging, and automatically adjusts the fast-charge current and charge termination voltage as the battery temperature varies. The MAX8934G also monitors the battery temperature while the battery is discharging, and provides a warning flag (active-low OT) to the system in the event that the battery is over temperature. Safety region 2 is supported (see Figure 6 for details). An ultra-low IQ, always-on LDO provides an additional 3.3V supply for system power.

The MAX8934G operates with either separate inputs for USB and AC adapter power, or from a single input that accepts both. All power switches for charging and switching the load between battery and external power are included on-chip. No external MOSFETs are required.

The MAX8934G features a Smart Power Selector to make the best use of limited USB or adapter power. Input current limit and battery charge current limit are independently set. Input power not used by the system charges the battery. Charge current limit and DC current limit can be set up to 1.5A and 2A, respectively, while USB input current can be set to 100mA or 500mA. Automatic input selection switches the system load from battery to external power.

The MAX8934G provides a SYS output voltage of 4.35V.

Other features include overvoltage protection (OVP), open-drain charge status and fault outputs, power-OK monitors, charge timers, and a battery thermistor monitor. Additionally, on-chip thermal limiting reduces the battery charge-rate to prevent charger overheating. The MAX8934G is available in a 28-pin, 4mm x 4mm, TQFN package.

Applications

  • Digital Still Cameras and Digital Video Cameras
  • Handheld Game Systems
  • PDAs, Palmtop, and Wireless Handhelds
  • Portable Media, MP3 Players, and PNDs

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Documentation & Resources

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  • Data Sheet (1)
  • Reliability Data (1)
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    Product Recommendations

    MAX8934G Companion Parts

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    MAX8934GETI+ Material Declaration Reliability Data Thin Quad Flatpack, No Leads
    MAX8934GETI+T Material Declaration Reliability Data Thin Quad Flatpack, No Leads
    Wafer Fabrication Data MAX8934G Reliability Data

    Support & Discussions

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