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LTM8062 Datasheet(PDF) 8 Page - Linear Technology |
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LTM8062 Datasheet(HTML) 8 Page - Linear Technology |
8 / 20 page LTM8062 8 8062f 8062 BD VINA 8.2μH SENSE RESISTOR 10μF 0.1μF 0.1μF RUN VINREG ADJ TMR NTC BIAS ADJ GND FAULT CHRG VIN BAT CURRENT MODE BATTERY MANAGEMENT CONTROLLER INTERNAL COMPENSATION BLOCK DIAGRAM The LTM8062 is a complete monolithic, mid-power, power tracking battery charger, addressing high input voltage ap- plications with solutions that use a minimum of external components. The product can be programmed for float voltages between 3.3V and 14.4V with just two external resistors, operating under a 1MHz fixed frequency, average current mode step-down architecture. A 2A power Schottky diode is integrated within the μModule for reverse input voltage protection. A wide input range allows the operation to full charge from an input voltage up to 32V. A precision threshold on the RUN pin allows the implementation of a UVLO feature by using a simple resistor network. The charger can also be put into a low current shutdown mode, in which the input supply bias is reduced to only 15μA. The LTM8062 employs an input voltage regulation loop, which reduces charge current if a monitored input volt- age falls below a programmed level. When the LTM8062 is powered by a solar panel, the input regulation loop is used to maintain the panel at peak output power. The LTM8062 automatically enters a battery precondition mode if the sensed battery voltage is very low. In this mode, the charge current is reduced to 300mA. Once the bat- tery voltage climbs above the internally set precondition threshold (2.3V at the ADJ pin), the μModule automati- cally increases the maximum charge current to the full programmed value. The LTM8062 can use a charge current based C/10 termina- tion scheme, which ends a charge cycle when the battery charge current falls to one-tenth the programmed charge current. The LTM8062 also contains an internal charge cycle control timer, for timer-based termination. When using the internal timer, the charge cycle can continue beyond the C/10 level to top-off the battery. The charge cycle terminates when the programmed time elapses, about three hours for a 0.68μF timer capacitor. The CHRG status pin continues to signal charging at a C/10 or greater rate, regardless of OPERATION |
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