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LTC4059A Datasheet(PDF) 5 Page - Linear Technology |
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LTC4059A Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page LTC4059/LTC4059A 5 4059fb PI FU CTIO S GND (Pins 1, 7): Ground/Exposed Pad. The exposed package pad is ground and must be soldered to the PC board for maximum heat transfer. Li CC (Pin 2, LTC4059): Li-Ion/Constant Current Input Pin. Pulling this pin above VLi CC disables voltage mode thereby providing a constant current to the BAT pin. This feature is useful for charging Nickel chemistry batteries. Tie to GND if unused. ACPR (Pin 2, LTC4059A): Open-Drain Power Supply Status Output. When VCC is greater than the undervoltage lockout threshold, the ACPR pin will pull to ground; otherwise the pin is forced to a high impedance state. 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 from this pin sets this 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 8V. This pin should be bypassed with at least a 1 µF capacitor. When VCC is within 35mV of the BAT pin voltage, the LTC4059 enters shutdown mode, dropping IBAT to less than 4µA. PROG (Pin 5): Charge Current Program and Charge Cur- rent Monitor Pin. Connecting a resistor, RPROG, to ground programs the charge current. When charging in constant- current mode, this pin servos to 1.21V. 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 EN (Pin 6): Enable Input Pin. Pulling this pin above the manual shutdown threshold (VMS is typically 0.92V) puts the LTC4059 in shutdown mode, thus terminating a charge cycle. In shutdown mode, the LTC4059 has less than 25 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. |
Similar Part No. - LTC4059A_15 |
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Similar Description - LTC4059A_15 |
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