MAX8856

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

Delivers Safe and Fast-Charging of Handheld Devices for a Single-Cell Li+ Battery from a USB/AC Adapter


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Description

The MAX8856 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, active-low EN2) select suspend mode, 100mA, 500mA, or ≤ 1A input current limits to comply with 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) 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 MAX8856 operates from a +4.25V to +5.5V supply and includes undervoltage lockout below +3.4V and overvoltage protection up to +14V.
MAX8856: Typical Operating Circuit MAX8856: Typical Operating Circuit Enlarge+

Key Features

  • Small, 3mm x 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)
  • 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

See parametric specs for Battery Chargers (75)


Part NumberCharging VIN
(V)
Max. ICHG
(A)
Cell ChemistryLithium Ion Cells
max
MAX8856 5.51
Li-Ion
Li-Polymer
1

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX8856.pdf 
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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