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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Overview
Features and Benefits
- 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
Product Details
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.
Applications
- Cellular Phones, Smartphones, PDAs
- Digital Cameras, MP3 Players
- USB Appliances, Charging Cradles and Docks
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Product Recommendations
MAX8856 Companion Parts
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX8856ETD+ | Material Declaration | Reliability Data | Thin Dual Flatpack No Leads | |
| MAX8856ETD+T | Material Declaration | Reliability Data | Thin Dual Flatpack No Leads | |
| Wafer Fabrication Data | MAX8856 Reliability Data |
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Lead Times
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