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LTC3411 Datasheet(PDF) 7 Page - Linear Integrated Systems |
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LTC3411 Datasheet(HTML) 7 Page - Linear Integrated Systems |
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7 / 18 page  LTC4065L/ LTC4065LX/LTC4065L-4.1 7 4065lfb PIN FUNCTIONS GND (Pin 1, Exposed Pad Pin 7): Ground. The Exposed Pad must be soldered to the PCB ground to provide both electrical contact and rated thermal performance. CHRG (Pin 2): Open-Drain Charge Status Output. The charge status indicator pin has three states: pull-down, pulse at 2Hz and high impedance state. This output can be used as a logic interface or as an LED driver. When the battery is being charged, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge current drops to 10% of the full-scale current, the CHRG pin is forced to a high impedance state. If the battery voltage remains below 2.9V for one quarter of the charge time, the battery is considered defective and the CHRG pin pulses at a frequency of 2Hz. BAT (Pin 3): Charge Current Output. Provides charge cur- rent to the battery and regulates the final float voltage (4.2V for LTC4065L/LTC4065LX and 4.1V for LTC4065L-4.1). An internal precision resistor divider on this pin sets the float voltage and is disconnected in shutdown mode. VCC (Pin 4): Positive Input Supply Voltage. This pin pro- vides power to the charger. VCC can range from 3.75V to 5.5V. This pin should be bypassed with at least a 1μF capacitor. When VCC is within 32mV of the BAT pin volt- age, the LTC4065L enters shutdown mode, dropping IBAT to about 1μA. EN (Pin 5): Enable Input Pin. Pulling this pin above the manual shutdown threshold (VMS is typically 0.82V) puts the LTC4065L in shutdown mode. In shutdown mode, the LTC4065L has less than 20μA supply current and less than 1μA battery drain current. Enable is the default state, but the pin should be tied to GND if unused. PROG (Pin 6): Charge Current Program and Charge Cur- rent 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: IBAT = VPROG RPROG • 205 Floating the PROG pin sets the charge current to zero. |
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