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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

Product Details

Key Features

Applications/Uses

Parametric specs for Battery Chargers
Charging VIN (V) (max) 6.6
Max. ICHG (A) 1.5
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 16
Charger (V) 4.2
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/24
Budgetary
Price (See Notes)
2.33
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 6.6
Max. ICHG (A) 1.5
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 16
Charger (V) 4.2
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/24
Budgetary
Price (See Notes)
2.33

Key Features

  • 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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX8677A: Typical Operating Circuit MAX8677A: Typical Operating Circuit 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 .