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USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Ohm Battery Switch in TDFN

Product Details

The MAX8606 complete 1-cell Li+ battery charge-management IC operates from either a USB port or AC adapter. It integrates a battery disconnect switch, current-sense circuit, PMOS pass element, and thermal-regulation circuitry, while eliminating the external reverse-blocking Schottky diode, to create a simple and small charging solution. The charging sequence initiates from power-OK indication, through prequalification, fast-charge, top-off charge, and finally charging-complete indication for single-cell Li+ batteries. Charging is controlled using constant current, constant voltage, or constant die-temperature (CCCVCTJ) regulation for safe operation in handhelds.

Two logic inputs (active-low EN1 and active-low EN2) select suspend mode, 100mA, 500mA, or ≤ 1A input current limits to suit USB requirements. Proprietary thermal-regulation circuitry limits the die temperature to +100°C to prevent excessive heat on the system PC board. Additional safety features include an NTC thermistor input (THM) and internal timers to protect the battery. A 3.5V to 4.2V SYS output, in conjunction with the low-RDSON battery switch, powers the system even when the battery is deeply discharged or not installed. The IC also offers a +3.3V/500µA output (VL), a charging status flag (active-low CHG), and an input-supply detection flag (active-low POK). The MAX8606 operates from a +4.25V to +5.5V supply and includes undervoltage lockout below +3.4V and overvoltage protection up to +14V.

Key Features

  • Small 3mm × 3mm Thermally Enhanced TDFN Package (0.8mm max height)
  • USB-Compliant Suspend Mode (20µA)
  • Selectable 100mA, 500mA, and Up to 1A Input Current Limits
  • USB or AC Adapter Input
  • +6V to +14V Input Overvoltage Protection
  • Input UVLO Below +4V Rising (3.5V Falling)
  • Automatic Current Sharing Between Battery Charging and System
  • Die Temperature Regulation (+100°C)
  • Prequal, Fast-Charge, and Top-Off Timers
  • Low Dropout Voltage, 250mV at 0.5A
  • NTC Thermistor Input
  • Charge Status and Input-Supply Detection Flags

Applications/Uses

  • Cellular Phones, Smartphones, PDAs
  • Digital Cameras, MP3 Players
  • USB Appliances, Charging Cradles, and Docks
Parametric specs for Battery Chargers
Charging VIN (V) (max) 5.5
Max. ICHG (A) 1
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 14
Charger (V) 4.2
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/14
Budgetary
Price (See Notes)
$2.14 @1k
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Simplified Block Diagram

MAX8606: Typical Operating Circuit MAX8606: Typical Operating Circuit Zoom icon

Design & Development

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Description

The MAX8606 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board demonstrating the MAX8606 linear charger for single-cell Li+ batteries. The EV kit operates from either a 100mA/500mA USB port or a 4.25V to 14V input power supply; however, charging is disabled when the input voltage exceeds 5.8V. Charging is optimized for Li+ cells using a control algorithm that includes low-battery precharging, voltage and current-limited fast-charging, and top-off charging, while continuously monitoring the battery for overvoltage, over/under temperature, and charging time. A 3.5V to 4.2V SYS output, in conjunction with the low-RDSON battery switch, powers the system even when the battery is deeply discharged or not installed. The charger status is indicated by two open-drain outputs. Two logic inputs (active-low EN1 and active-low EN2) select suspend mode, 100mA, 500mA, or 750mA fast-charge mode. The maximum charge current is programmable up to 1A. The MAX8606 is assembled in the space-saving 14-pin, 3mm x 3mm TDFN package.
The MAX8606 EV kit can also be used to evaluate the MAX8856. To evaluate the MAX8856, request a free sample along with the EV kit.

View Details

Features

  • Selectable 100mA, 500mA, and Up to 1A Input Current Limits
  • 4.25V to 14V Input Voltage Range
  • Input Overvoltage Protection
  • Battery Thermistor Input
  • Charger Status Outputs
  • Thermally Optimized Charge Rate
  • Type-B USB Jack
  • 14-Pin, 3mm x 3mm TDFN Package
  • Proven PCB Layout
  • Fully Assembled and Tested

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Support & Training

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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) 5.5
Max. ICHG (A) 1
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 14
Charger (V) 4.2
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/14
Budgetary
Price (See Notes)
$2.14 @1k

Key Features

  • Small 3mm × 3mm Thermally Enhanced TDFN Package (0.8mm max height)
  • USB-Compliant Suspend Mode (20µA)
  • Selectable 100mA, 500mA, and Up to 1A Input Current Limits
  • USB or AC Adapter Input
  • +6V to +14V Input Overvoltage Protection
  • Input UVLO Below +4V Rising (3.5V Falling)
  • Automatic Current Sharing Between Battery Charging and System
  • Die Temperature Regulation (+100°C)
  • Prequal, Fast-Charge, and Top-Off Timers
  • Low Dropout Voltage, 250mV at 0.5A
  • NTC Thermistor Input
  • Charge Status and Input-Supply Detection Flags

Applications/Uses

  • Cellular Phones, Smartphones, PDAs
  • Digital Cameras, MP3 Players
  • USB Appliances, Charging Cradles, and Docks

Description

The MAX8606 complete 1-cell Li+ battery charge-management IC operates from either a USB port or AC adapter. It integrates a battery disconnect switch, current-sense circuit, PMOS pass element, and thermal-regulation circuitry, while eliminating the external reverse-blocking Schottky diode, to create a simple and small charging solution. The charging sequence initiates from power-OK indication, through prequalification, fast-charge, top-off charge, and finally charging-complete indication for single-cell Li+ batteries. Charging is controlled using constant current, constant voltage, or constant die-temperature (CCCVCTJ) regulation for safe operation in handhelds.

Two logic inputs (active-low EN1 and active-low EN2) select suspend mode, 100mA, 500mA, or ≤ 1A input current limits to suit USB requirements. Proprietary thermal-regulation circuitry limits the die temperature to +100°C to prevent excessive heat on the system PC board. Additional safety features include an NTC thermistor input (THM) and internal timers to protect the battery. A 3.5V to 4.2V SYS output, in conjunction with the low-RDSON battery switch, powers the system even when the battery is deeply discharged or not installed. The IC also offers a +3.3V/500µA output (VL), a charging status flag (active-low CHG), and an input-supply detection flag (active-low POK). The MAX8606 operates from a +4.25V to +5.5V supply and includes undervoltage lockout below +3.4V and overvoltage protection up to +14V.

Simplified Block Diagram

MAX8606: Typical Operating Circuit MAX8606: 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.