Description

PMP10594 is a synchronous 4-switch buck-boost converter reference design which utilizes the LM5175 controller for battery charger applications. The output voltage set point can be adjusted by a PWM signal over the range of 7.1V to 9.2V. I2C programming allows independent control of the average input current and charge current. Full scale input current limiting is 6A: while charge current is programmable to 12.5A. The LM5175 average current loop sets a maximum output current of 20A: which should never engage under normal circumstances. Additional pulse-by-pulse current limiting is inherent in the current-mode controller: making this a very robust design. A battery disconnect switch is used to provide trickle charging if the battery voltage is less than 6V.