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LTC4069 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4069 Datasheet(HTML) 6 Page - Linear Technology |
6 / 16 page LTC4069 6 4069fb PIN FUNCTIONS 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 (75% duty cycle). When the NTC pin voltage rises above 0.76 • VCC or drops below 0.35 • VCC, the CHRG pin pulses at a frequency of 2Hz (25% duty cycle). 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 1μF capacitor. When VCC is within 32mV of the BAT pin voltage, the LTC4069 enters shutdown mode, dropping IBAT to about 1μA. NTC (Pin 5): Input to the NTC (Negative Temperature Coefficient) Thermistor Temperature Monitoring Circuit. Under normal operation, connect a thermistor from the NTC pin to ground and a resistor of equal value from the NTC pin to VCC. When the voltage at this pin drops below 0.35 • VCC at hot temperatures or rises above 0.76 • VCC at cold, charging is suspended, the internal timer is frozen and the CHRG pin output will start to pulse at 2Hz. Pulling this pin below 0.016 • VCC disables the NTC feature. There is approximately 3°C of temperature hysteresis associated with each of the input comparator’s thresholds. PROG (Pin 6): 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 = • 1000 Floating the PROG pin puts the charger in shutdown mode. In shutdown mode, the LTC4069 has less than 20μA supply current and about 1μA battery drain current. Exposed Pad (Pin 7): Ground. The Exposed Pad must be soldered to the PCB ground to provide both electrical contact and rated thermal performance. |
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