MAX8677A

PRODUCTION

1.5A Dual-Input, USB/AC Adapter Charger and Smart Power Selector

Optimized Smart Power control maximizes charger rate from USB/AC-adapter power while supporting system load

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • Complete Charger and Smart Power Selector
  • No External MOSFETs Required
  • Common or Separate USB and Adapter Inputs
  • System Operates with Discharged or No Battery
  • Automatic Adapter/USB/Battery Switchover
  • Load Peaks Over Adapter Rating Are Supported by Battery
  • Input Overvoltage Protection to 16V
  • 40mΩ System-to-Battery Switch
  • Thermal Regulation Prevents Overheating
  • Active-Low CHG, Active-Low DOK, Active-Low UOK, and Active-Low FLT Indicators
  • 5.3V (typ) SYS Regulation Voltage

The MAX8677A is an integrated 1-cell Li+ charger and Smart Power Selector™ with dual (DC and USB) power inputs. It can operate 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 MAX8677A features a Smart Power Selector to make the best use of limited USB or adapter power. The battery charge current and input current limit are independently set up to 1.5A and 2A, respectively. Input power not used by the system charges the battery. USB input current can be set to 100mA or 500mA. Automatic input selection switches the system load from battery to external power.

Other features include overvoltage protection (OVP), charge status and fault outputs, power-OK monitors, charge timer, and battery thermistor monitor. Additionally, on-chip thermal limiting reduces the battery charge rate to prevent overheating. The MAX8677A is available in a 4mm x 4mm, 24-pin TQFN-EP package.

Applications

  • Digital Cameras
  • GPS Navigation
  • PDAs, Palmtops, and Wireless Handhelds
  • Portable Media/MP3 Players
  • Smart Cell Phones
MAX8677A
1.5A Dual-Input, USB/AC Adapter Charger and Smart Power Selector
MAX8677A: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Battery Charger ICs 7
MAX8677C
PRODUCTION 1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector
MAX8934A
PRODUCTION Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
MAX8934B
PRODUCTION Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
MAX8934C
PRODUCTION Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
MAX8934D
PRODUCTION Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
MAX8934G
PRODUCTION Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring
MAX8934E
PRODUCTION Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
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Evaluation Kits

MAX8677AEVKIT

MAX8677A Evaluation Kit

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Features and Benefits

  • DC Input Current Limit of 2A (EV Kit Standard Configuration)
  • DC Input Current-Limit-Adjustment Range of 0.5A to 2A
  • USB Current Limit of 100mA or 500mA
  • Charge-Current Limit of 1A (EV Kit Standard Configuration)
  • Charge-Current-Adjustment Range of 0.3A to 1.5A
  • Input Current Thermal-Limit Threshold of +100°C
  • 24-Pin, 4mm x 4mm Thin QFN Package

Product Details

The MAX8677A evaluation kit (EV kit) demonstrates the MAX8677A dual-input charger and Smart Power Selector™ IC. The EV kit charges a single-cell Li-ion (Li+) battery from a DC input (AC adapter) or a USB 100mA/500mA source and provides system power from the DC input, USB input, or battery. The DC input has a resistor-adjustable current limit, while USB current input limit is logic programmed to 100mA/500mA. USB suspend mode is also supported. The charge current is adjustable from 300mA to 1.5A. The system load has priority over the charger so that charge current is reduced as necessary to prevent input overload. Charge current is also thermally regulated.

Applications

  • Digital Cameras
  • GPS Navigation
  • PDAs, Palmtops, and Wireless Handhelds
  • Portable Media/MP3 Players
  • Smart Cell Phones
MAX8677AEVKIT
MAX8677A Evaluation Kit

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