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LTC4054-4.2 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4054-4.2 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LTC4054-4.2/LTC4054X-4.2 405442xf PI FU CTIO S CHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 20 µA is connected to the CHRG pin, indicating an “AC present” condition. When the LTC4054 detects an undervoltage lockout condition, CHRG is forced high impedance. GND (Pin 2): Ground. BAT (Pin 3): Charge Current Output. 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 which is disconnected in shutdown mode. VCC (Pin 4): Positive Input Supply Voltage. Provides power to the charger. VCC can range from 4.25V to 6.5V and should be bypassed with at least a 1 µF capacitor. When VCC drops to within 30mV of the BAT pin voltage, the LTC4054 enters shutdown mode, dropping IBAT to less than 2 µA. PROG (Pin 5): Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is pro- grammed by connecting a 1% resistor, RPROG, to ground. 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: IBAT = (VPROG/RPROG) • 1000 The PROG pin can also be used to shut down the charger. Disconnecting the program resistor from ground allows a 3 µA current to pull the PROG pin high. When it reaches the 1.21V shutdown threshold voltage, the charger enters shutdown mode, charging stops and the input supply current drops to 25 µA. This pin is also clamped to approximately 2.4V. Driving this pin to voltages beyond the clamp voltage will draw currents as high as 1.5mA. Reconnecting RPROG to ground will return the charger to normal operation. |
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