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LTC4058 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4058 Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page 7 LTC4065/LTC4065A 4065fb PI FU CTIO S GND (Pin 1): Ground. 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 current to the battery and regulates the final float voltage to 4.2V. 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 provides power to the charger. VCC can range from 3.75V to 5.5V. This pin should be bypassed with at least a 1 µF capacitor. When VCC is within 32mV of the BAT pin voltage, the LTC4065 enters shutdown mode, dropping IBAT to about 1µA. EN (Pin 5, LTC4065 Only): Enable Input Pin. Pulling this pin above the manual shutdown threshold (VMS is typi- cally 0.82V) puts the LTC4065 in shutdown mode. In shutdown mode, the LTC4065 has less than 20 µA supply current and less than 1 µA battery drain current. Enable is the default state, but the pin should be tied to GND if unused. ACPR (Pin 5, LTC4065A Only): Open-Drain Power Supply Status Output. When VCC is greater than the undervoltage lockout threshold (3.6V) and VBAT+ 80mV (if VBAT> 3.6V), the ACPR pin will be pulled down to ground; otherwise the pin is high impedance. 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: I V R BAT PROG PROG = • 1000 Floating the PROG pin sets the charge current to zero (LTC4065) or puts the part in shutdown mode (LTC4065A). In shutdown mode, the LTC4065A has less than 20 µA supply current and about 1 µA battery drain current. Exposed Pad (Pin 7): Ground. The Exposed Pad must be soldered to the PCB ground to provide both electrical con- tact and rated thermal performance. |
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