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LTC1731-8.2 Datasheet(PDF) 5 Page - Lite-On Technology Corporation |
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LTC1731-8.2 Datasheet(HTML) 5 Page - Lite-On Technology Corporation |
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5 / 12 page  5 LTC1731-8.2/LTC1731-8.4 sn1731 17318fs PIN FUNCTIONS BAT (Pin 1): Battery Sense Input. A bypass capacitor of at least 10 µF is required to keep the loop stable when the battery is not connected. A precision internal resistive divider sets the final float potential on this pin. The resistor divider is disconnected in sleep mode. CHRG (Pin 2): Open-Drain Charge Status Output. 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 for at least 0.32 seconds, the N-channel MOSFET turns off and a 100 µA current source is connected from the CHRG pin to GND. When the timer runs out or the input supply is removed, the current source will be disconnected and the CHRG pin is forced into a high impedance state. TIMER (Pin 3): Timer Capacitor and Constant-Voltage Mode Disable Input Pin. A capacitor CTIMER connected from this pin to ground sets a 30 hour/ µF time period for charge termination. When the TIMER pin is connected to VCC, the constant-voltage mode and the timer is disabled and the IC will operate in constant-current mode only. Short the TIMER pin to GND to disable the internal timer and the C/10 functions. GND (Pin 4): Ground. PROG (Pin 5): Charge Current Program and Shutdown Input Pin. The charge current is programmed by connect- ing a resistor, RPROG to ground. The charge current is IBAT = (VPROG • 800Ω)/(RPROG • RSENSE). The IC can be forced into shutdown by floating the PROG pin and allowing the internal 2.5 µA current source to pull the pin above the 2.457V shutdown threshold voltage. DRV (Pin 6): Drive Output Pin for the P-Channel MOSFET or PNP Transistor. If a PNP transistor is used, it must have high gain (see Applications Information section). The DRV pin is internally clamped to 6.5V below VCC. VCC (Pin 7): Input Supply Voltage. VCC ranges from 8.8V to 12V when charging. If VCC drops below VBAT + 54mV, for example when the input supply is disconnected, then the IC enters sleep mode with ICC < 30µA. Bypass this pin with a 1 µF capacitor. SENSE (Pin 8): Current Sense Input. Connect this pin to the sense resistor. Choose the resistor value using the following equation: RSENSE = (VPROG • 800Ω)/(RPROG • IBAT) |
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