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LTC4080EMSE-PBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC4080EMSE-PBF Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page LTC4080 9 4080fb PI FU CTIO S BAT (Pin 1): Charge Current Output and Buck Regulator Input. Provides charge current to the battery and regulates the final float voltage to 4.2V. An internal precision resistor divider from this pin sets the float voltage and is disconnected in charger shutdown mode. This pin should be decoupled with a low ESR capacitor for low-noise buck operation. VCC(Pin2):PositiveInputSupplyVoltage.Thispinprovides power to the battery charger. VCC can range from 3.75V to 5.5V. This pin should be bypassed with at least a 1μF capacitor. When VCC is less than 32mV above the BAT pin voltage, the battery charger enters shutdown mode. ⎯E⎯N⎯_⎯C⎯H⎯R⎯G(Pin3):EnableInputPinfortheBatteryCharger. Pulling this pin above the manual shutdown threshold (VIH) puts the LTC4080 charger in shutdown mode, thus stopping the charge cycle. In battery charger shutdown mode, the LTC4080 has less than 10μA supply current and less than 5μA battery drain current if the regulator is not running. Enable is the default state, but the pin should be tied to GND if unused. PROG (Pin 4): Charge Current Program and Charge Current Monitor Pin. Connecting a 1% resistor, RPROG, to ground programs the charge current. When charging in constant-current mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the charge current using the following formula: I V R BAT PROG PROG = •40 0 ⎯A⎯C⎯P⎯R (Pin 5): Open-Drain Power Supply Status Output. When VCC is greater than the undervoltage lockout threshold (3.6V) and greater than VBAT + 80mV, the ⎯A⎯C⎯P⎯R pin will be pulled to ground; otherwise the pin is high impedance. ⎯C⎯H⎯R⎯G (Pin 6): Open-Drain Charge Status Output. The charge status indicator pin has three states: pulldown, high impedance state, and pulse at 2Hz. This output can be used as a logic interface or as an LED driver. When the battery is being charged, the ⎯C⎯H⎯R⎯G pin is pulled low by an internal N-channel MOSFET. When the charge current drops to 10% of the full-scale current, the ⎯C⎯H⎯R⎯G pin is forced to a high impedance state. When the battery voltage remains below 2.9V for one quarter of the full charge time, the battery is considered defective, and the ⎯C⎯H⎯R⎯G pin pulses at a frequency of 2Hz with 75% duty cycle. FB (Pin 7): Feedback Pin for the Buck Regulator. A resistor divider from the regulator’s output to the FB pin programs the output voltage. Servo value for this pin is 0.8V. MODE (Pin 8): Burst Mode Enable Pin. Tie this pin high to force the LTC4080 regulator into Burst Mode operation for all load conditions. Tie this pin low to force constant- frequency mode operation for all load conditions. Do not float this pin. EN_BUCK (Pin 9): Enable Input Pin for the Switching Regulator. Pull this pin high to enable the regulator, pull low to shut down. Do not float this pin. SW (Pin 10): Switch Pin for the Buck Regulator. Minimize the length of the metal trace connected to this pin. Place the inductor as close to this pin as possible. GND (Pin 11): Ground. This pin is the back of the Exposed Pad package and must be soldered to the PCB for electrical connection and rated thermal performance. |
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