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LTC4062 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4062 Datasheet(HTML) 7 Page - Linear Technology |
7 / 20 page LTC4062 7 4062f PI FU CTIO S BAT (Pin 1): Charge Current Output. This pin provides charge current to the battery and regulates the final float voltage to 4.2V. IN+ (Pin 2): Positive Input of the Micropower Comparator. The negative input is tied internally to a precise bandgap voltage reference of 1V. There is approximately 50mV of hysteresis associated with the input comparator threshold (rising edge). TIMER (Pin 3): Timer Program and Termination Select Pin. This pin selects which method is used to terminate the charge cycle. Connecting a capacitor, CTIMER, to ground selects charge time termination. The charge time is set by the following formula: TIME HOURS HOURS C F or CF TIME HOURS HOURS TIMER TIMER () () • . .• () () = µ =µ 3 01 01 3 Connecting the TIMER pin to ground selects charge cur- rent termination, while connecting the pin to VCC selects user termination. See Applications Information for more information on current and user termination. OUT (Pin 4): Low Power Comparator Open-Drain Output. This comparator output pin has two states; pull-down and high impedance. This output can be used as a logic interface or as an LED driver. In the pull-down state, an NMOS transistor capable of sinking 10mA pulls down on the OUT pin. The state of this pin is dependent on the value of IN+. When IN+ is greater than 1V the output pin is in pull- down state, if IN+ is less than 1V the output pin is in high impedance state. See Applications Information. CHRG (Pin 5): Open-Drain Charge Status Output. The charge status indicator pin has three states: pull-down, pulse at 6Hz and high impedance. This output can be used as a logic interface or as a LED driver. In the pull-down state, an NMOS transistor capable of sinking 10mA pulls down on the CHRG pin. The state of this pin depends on the value of IDETECT as well as the termination method being used. See Applications Information. C/5 (Pin 6): C/5 Enable Input. Used to control the amount of current drawn by the charger when powered from a USB port. A logic high on the C/5 pin sets the current limit to 100% of the current programmed by the PROG pin. A logic low on the C/5 pin sets the current limit to 20% of the current programmed by the PROG pin. An internal 3MΩ pull-down resistor defaults the C/5 pin to its low current state. EN (Pin 7): Charger Enable Input. A logic high on the EN pin places the charger into shutdown mode, where the input quiescent current is less than 50µA. A logic low on this pin enables charging. An internal 3MΩ pull-down resistor to ground defaults the charger to its enabled state. IDET (Pin 8): Current Detection Threshold Program Pin. The current detection threshold, IDETECT, is set by con- necting a resistor, RDETECT, to ground. IDETECT is set by the following formula: I R R I V R or R V I DETECT PROG DET CHG DET DET DETECT == = 10 100 100 • The CHRG pin becomes high impedance when the charge current drops below IDETECT. IDETECT can be set to 1/10th the programmed charge current by connecting IDET di- rectly to PROG. If the IDET pin is not connected, the CHRG output remains in its pull-down state until the charge time elapses and terminates the charge cycle. See Applications Information. This pin is clamped to approximately 2.4V. Driving this pin to voltages beyond the clamp voltage should be avoided. PROG (Pin 9): Charge Current Program and Charge Cur- rent Monitor. The charge current is set by connecting a resistor, RPROG, to ground. When charging in constant current mode, this pin servos to 1V. The voltage on this pin can be used to measure the charge current using the following formula: I V R BAT PROG PROG =• 1000 |
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