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LTC4066 Datasheet(PDF) 8 Page - Linear Technology |
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LTC4066 Datasheet(HTML) 8 Page - Linear Technology |
8 / 28 page LTC4066/LTC4066-1 8 4066fc PIN FUNCTIONS TYPICAL PERFORMANCE CHARACTERISTICS WALL Connect Waveforms, VIN = 5V WALL Disconnect Waveforms, VIN = 5V WALL 5V/DIV IWALL 0.5A/DIV IIN 0.5A/DIV IBAT 0.5A/DIV 1ms/DIV 4066 G27 VBAT = 3.85V IOUT = 100mA RPROG = 71.5k WALL 5V/DIV IWALL 0.5A/DIV IIN 0.5A/DIV IBAT 0.5A/DIV 1ms/DIV 4066 G28 VBAT = 3.85V IOUT = 100mA RPROG = 71.5k OUT (Pins 1, 3, 8): Voltage Output. This pin is used to provide controlled power to a USB device from either USB VBUS (IN) or the battery (BAT) when the USB is not present. This pin can also be used as an input for battery charging when the USB is not present and a wall adapter is applied to this pin. OUT should be bypassed with at least 4.7μF to GND. Connect Pins 1, 3 and 8 with a resistance no greater than 10mΩ. BAT (Pins 2, 4, 5): Connect to a single cell Li-Ion battery. This pin is used as an output when charging the battery, and as an input when supplying power to OUT. When the OUT pin potential drops below the BAT pin potential, an ideal diodefunctionconnectsBATtoOUTandpreventsVOUTfrom dropping more than 50mV below VBAT. A precision internal resistor divider sets the final float (charging) potential on this pin. The internal resistor divider is disconnected when IN and OUT are in undervoltage lockout. Connect Pins 2, 4 and 5 with a resistance no greater than 10mΩ. IN (Pin 9): Input Supply. Connect to USB supply, VBUS. Input current to this pin is limited to either 20% or 100% of the current programmed by the CLPROG pin as determined by the state of the HPWR pin. The input current limit can also be disabled by pulling CLDIS high. Charge current (to BAT pin) supplied through the input is set to the current programmed by the PROG pin but will be limited by the input current limit if charge current is set greater than the input current limit. CLDIS (Pin 10): Current Limit Disable. This logic input is used to disable the input current limit programmed by CLPROG. A voltage greater than 1.2V on the pin will set the current limit to IIN(MAX) (typically 2.6A). A weak pull- down current is internally applied to this pin to ensure it is low at power-up when the input is not being driven externally. SUSP (Pin 11): Suspend Mode Input. Pulling this pin above 1.2V will disable the power path from IN to OUT. The supply current from IN will be reduced to comply with the USB specification for Suspend mode. Both the ability to charge the battery from OUT and the ideal diode function (from BAT to OUT) will remain active. Suspend mode will reset the charge timer if VOUT is less than VBAT while in suspend mode. If VOUT is kept greater than VBAT, such as when a wall adapter is present, the charge timer will not be reset when the part is put in suspend. A weak pull-down current is internally applied to this pin to ensure it is low at power-up when the pin is not being driven externally. |
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