LTC1731ES8-8.4#PBF

LTC1731-8.4 is a complete constant current/constant-voltage linear charger controller for 2-cell lithium-ion (Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries can also be charged with constant current using external termination. An internal resistor divider and precision reference set the final float potential with 1% accuracy. When the input supply is removed, this device automatically enter a low current sleep mode, dropping the battery drain current to typically 15µA. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until battery voltage exceeds 4.95V. It is used in application such as cellular phones, handheld computers, charging docks and cradles, programmable current source etc.

• Regulated output voltage is 8.4V typical at (TA = 25°C. VCC = 9V)
• Programmable charge current
• Programmable charge termination timer
• Automatic trickle charging of low voltage cells
• Programmable for constant-current-only mode
• Drive pin current is 26µA typical at (VDRV = VCC – 2V, TA = 25°C. VCC = 9V)
• Operating temperature is -40°C to 85°C
• Package style is 8-lead plastic NSOIC

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