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LTC4068-4.2 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4068-4.2 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LTC4068-4.2/LTC4068X-4.2 406842fa When VCC is within 100mV of the BAT pin voltage, the LTC4068 enters shutdown mode dropping the battery drain current to less than 2µA. ACPR (Pin 7): Power Supply Status Open-Drain Output. When VCC is greater than the undervoltage lockout thresh- old and at least 100mV above VBAT, the ACPR pin is pulled to ground; otherwise, the pin is high impedance. EN (Pin 8): Enable Input . A logic high on the EN pin will put the LTC4068 into shutdown mode where the battery drain current is reduced to less than 2µA and the supply current is reduced to less than 50µA. A logic low or floating the EN pin (allowing an internal 2MΩ pull-down resistor to pull this pin low) enables charging. PI FU CTIO S PROG (Pin 5): Charge Current Program and Charge Cur- rent Monitor. Charge current is programmed by connect- ing a 1% resistor, RPROG, to ground. 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) • 1000 This pin is clamped to approximately 2.4V. Driving this pin to voltages beyond the clamp voltage can draw large currents and should be avoided. VCC (Pin 6): Positive Input Supply Voltage. Provides power to the charger. VCC can range from 4.25V to 6.5V. This pin should be bypassed with at least a 1µF capacitor. BLOCK DIAGRA – + – + 2 6 – + 120°C TDIE TA MA CA C1 * 1× 1000× VA R1 BAT R2 R3 1V 0.1V R4 R5 PROG 5µA RPROG REF 1.211V VCC CHRG 3 EN 8 GND 4, 9 406842 BD – + C2* 2.9V TO BAT *TRICKLE CHARGE DISABLED ON THE LTC4068X TERM ACPR CHARGE SHDN EN LOGIC ACPR 7 5 1× ITERM RTERM 1 |
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