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.
Key Features
Applications/Uses
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
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-2 of 2
MAX8856
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Status
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX8856ETD+
Active
TDFN-EP;14 pin;10 mm²
Outline Drawing: 21-0137 (PDF)
Land Pattern: 90-0063 (PDF)
Use pkgcode/variation: T1433+2*
MAX8856 allows direct control of the open/close state of the switch between SYS and BAT, using the innovative GATE pin. However, customers should use the MAX8606 if their application requires the timer (TMR) function.
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