LTC4009CUF#PBF

LTC4009 is a constant-current/constant-voltage battery charger controller. It uses a synchronous quasi-constant frequency PWM control architecture that will not generate audible noise with ceramic bulk capacitors. Charge current is set by the combination of external sense, input and programming resistors. With no built-in termination, this device family charges a wide range of batteries under external control. This device includes AC adapter input current limiting which maximizes the charge rate for a fixed input power level. An external sense resistor programs the input current limit, and the ICL status pin indicates when the battery charge current is being reduced as a result of AC adapter current limiting. The CHRG status pin is active during all charging modes, including special indication for low charge current. It is widely used in applications such as notebook computers, portable instruments, battery backup systems etc.

• Switching frequency is 550KHz typical at ( TA = 25°C, DCIN = 20V, BAT = 12V, GND = 0V)
• Output float voltage accuracy is ±0.8% at (TA = 25°C, DCIN = 20V)
• No audible noise with ceramic capacitors
• Wide input voltage range is 6V to 28V
• Wide output voltage range is 2V to 28V
• Indicator outputs for AC adapter present, charging
• Analog charge current monitor, micropower shutdown
• Operating temperature range is 0°C to 85°C
• Package style is 20-lead plastic QFN 0

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