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28V Linear Li+ Battery Charger with Smart Autoboot Assistant

The Simplest, Safest, and Smallest Charging Solution for Handheld Equipment

Product Details

The MAX8814 intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear charger is designed for charging a single-cell lithium-ion (Li+) battery.

The MAX8814 controls the charging sequence from the prequalification state through constant-current fast-charge and the final constant voltage charge. The IC achieves high flexibility by providing an adjustable fast-charge current through an external resistor. It also features a booting assistant circuit that distinguishes input sources and battery connection, and provides an output signal (ABO) for system booting.

The device operates over the extended temperature range (-40°C to +85°C), and is available in an 8-pin thermally enhanced 2mm x 2mm TDFN package (0.8mm max height).

Key Features

  • Reduces External Components and Total Cost
    • Integrated Current-Sensing Circuit, MOSFET Pass Element, and Thermally Regulation Circuitry
    • No Reverse Blocking Diode Required
  • Guarantees Safe and Accurate Battery Charging
    • Proprietary Die Temperature Regulation Control (+115°C) Allows Maximum Charging Current Without Damaging the IC
    • 4.25V to 28V Input Voltage Range with Over-Voltage Protection Above +7V to Protect Against Unqualified or Faulty AC Adapters
    • Soft-Start Limits Inrush Current
  • Integrated System Features for Compact Designs
    • Programmable Fast-Charge Current: 1ARMS Max
    • Charge-Current Monitor for Fuel Gauging (ISET)
    • Input Power-Source Detection Output (Active-Low POK) and Charge-Enable Input (Active-Low EN)
    • Output for Autobooting (ABO)
  • Reduce Power Dissipation
    • Low Dropout Voltage (300mV at 500mA)

Applications/Uses

  • Bluetooth® Equipment
  • Cellular and Cordless Phones
  • Charging Cradles and Docks
  • Digital Still Cameras
  • MP3 Players
  • Smartphones and PDAs
  • USB Appliances
Parametric specs for Battery Chargers
Charging VIN (V) (max) 6.5
Max. ICHG (A) 0.6
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 28
Charger (V) 4.2
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/8
Budgetary
Price (See Notes)
$1.60 @1k
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Simplified Block Diagram

MAX8814: Typical Operating Circuit MAX8814, a stand-alone, CCCV, thermally regulated linear charger, is made to charge a single-cell lithium-ion (Li+) battery | Typical Operating Circuit Zoom icon

Design & Development

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Description

The MAX8814 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) for evaluating the MAX8814 28V linear Li+ battery charger. The MAX8814 EV kit operates from an input supply range of 4.25V to 28V, but the IC disables charging if the input voltage exceeds 7V to protect against unqualified or faulty AC adapters. The MAX8814 EV kit features an adjustable fast-charge current set by an external resistor (R2). Other features include an active-low control input (active-low EN) and an active-low input power source detection output (active-low POK). The IC also features a booting assistant circuit that distinguishes input sources and battery connection and provides an output signal (ABO) for system booting.

View Details

Features

  • CCCV, Thermally Regulated Linear 1-Cell Li+ Battery Charger
  • No External MOSFET, Reverse Blocking Diode, or Current-Sense Resistor
  • Programmable Fast-Charge Current (1ARMS max)
  • Proprietary Die Temperature Regulation Control (+115°C)
  • 4.25V to 28V Input Voltage Range with Input OVP Above 7V
  • Charge-Current Monitor for Fuel Gauging (ISET)
  • Low Dropout Voltage (300mV at 500mA)
  • Input Power-Source Detection Output (Active-Low POK) and Charge-Enable Input (Active-Low EN)
  • Soft-Start Limits Inrush Current
  • Output for Autobooting (ABO)
  • Fully Assembled and Tested

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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.

Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 6.5
Max. ICHG (A) 0.6
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 28
Charger (V) 4.2
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/8
Budgetary
Price (See Notes)
$1.60 @1k

Key Features

  • Reduces External Components and Total Cost
    • Integrated Current-Sensing Circuit, MOSFET Pass Element, and Thermally Regulation Circuitry
    • No Reverse Blocking Diode Required
  • Guarantees Safe and Accurate Battery Charging
    • Proprietary Die Temperature Regulation Control (+115°C) Allows Maximum Charging Current Without Damaging the IC
    • 4.25V to 28V Input Voltage Range with Over-Voltage Protection Above +7V to Protect Against Unqualified or Faulty AC Adapters
    • Soft-Start Limits Inrush Current
  • Integrated System Features for Compact Designs
    • Programmable Fast-Charge Current: 1ARMS Max
    • Charge-Current Monitor for Fuel Gauging (ISET)
    • Input Power-Source Detection Output (Active-Low POK) and Charge-Enable Input (Active-Low EN)
    • Output for Autobooting (ABO)
  • Reduce Power Dissipation
    • Low Dropout Voltage (300mV at 500mA)

Applications/Uses

  • Bluetooth® Equipment
  • Cellular and Cordless Phones
  • Charging Cradles and Docks
  • Digital Still Cameras
  • MP3 Players
  • Smartphones and PDAs
  • USB Appliances

Description

The MAX8814 intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear charger is designed for charging a single-cell lithium-ion (Li+) battery.

The MAX8814 controls the charging sequence from the prequalification state through constant-current fast-charge and the final constant voltage charge. The IC achieves high flexibility by providing an adjustable fast-charge current through an external resistor. It also features a booting assistant circuit that distinguishes input sources and battery connection, and provides an output signal (ABO) for system booting.

The device operates over the extended temperature range (-40°C to +85°C), and is available in an 8-pin thermally enhanced 2mm x 2mm TDFN package (0.8mm max height).

Simplified Block Diagram

MAX8814: Typical Operating Circuit MAX8814, a stand-alone, CCCV, thermally regulated linear charger, is made to charge a single-cell lithium-ion (Li+) battery | Typical Operating Circuit Zoom icon

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.