MAX8671X

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices

Five Regulated Output Voltages and Li+ Charger with Smart Power Control that Allows a System to Operate Without a Battery


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Description

The MAX8671X integrated power-management IC (PMIC) is ideal for use in portable media players and other handheld devices. In addition to five regulated output voltages, the MAX8671X integrates a 1-cell lithium ion (Li+) or lithium polymer (Li-Poly) charger and Smart Power Selector™ with dual (AC-to-DC adapter and USB) power inputs. The dual-input Smart Power Selector supports end products with dual or single power connectors. All power switches for charging and switching the system load between battery and external power are included on-chip. No external MOSFETs are required.

Maxim's Smart Power Selector makes the best use of limited USB or AC-to-DC adapter power. Battery charge current and input current limit are independently set. Input power not used by the system charges the battery. Charge current and DC current limit are programmable up to 1A while 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, charge status and fault outputs, power-OK monitors, charge timer, and battery thermistor monitor. In addition, on-chip thermal limiting reduces battery charge rate to prevent charger overheating.

The MAX8671X offers adjustable voltages for all outputs. Similar parts with factory-preset output voltages are also available (contact factory for availability).
MAX8671X: Simplified Applications Circuit MAX8671X: Simplified Applications Circuit Enlarge+

Key Features

  • 16V-Tolerant USB and DC Inputs
  • Automatically Powers from External Power or Battery
  • Operates with No Battery Present
  • Single-Cell Li+/Li-Poly Charger
  • Three 2MHz Step-Down Regulators
    • Up to 96% Efficiency
  • Two Low IQ Linear Regulators
  • Output Power-Up Sequencing
  • Thermal-Overload Protection

Applications/Uses

  • Digital Still Cameras
  • Digital Video Cameras
  • GPS/Portable Navigation Devices
  • MP3 Players/Portable Media Players
  • Portable Audio Players
  • Smartphones/PDAs/PDA Phones

Technical Documents

Full System Design 5672 Fit Vital Signs Monitoring Shirt
App Note 4181 Simplify the Design of 1-Cell Li+ Battery-Operated Devices
Request Reliability Report for: MAX8671X 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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