7.1 Overview

The LMZ31710 is a full-featured 2.95 V to 17 V input, 10-A, synchronous step-down converter with PWM, MOSFETs, inductor, and control circuitry integrated into a low-profile, overmolded package. This device enables small designs by integrating all but the input and output capacitors, while still leaving the ability to adjust key parameters to meet specific design requirements. The LMZ31710 provides a wide output voltage range of 0.6 V to 5.5 V. In most applications, a single external resistor is used to adjust the output voltage. The switching frequency is also adjustable by using an external resistor or a synchronization pulse to accommodate various input/output voltage conditions and to optimize efficiency. The device provides accurate voltage regulation for a variety of loads by using an internal voltage reference that is ±1% accurate over temperature. The INH/UVLO pin can be pulled low to put the device in standby mode to reduce input quiescent current. The input under-voltage lockout can be adjusted using a resistor divider on the IN/UVLO pin of the device. The device provides a power good signal to indicate when the output is within ±5% of its nominal voltage. The ability to parallel the LMZ31710 allows it to be used in higher current applications. Thermal shutdown and current limit features protect the device during an overload condition. Automatic pulse skip mode improves light-load efficiency. A 42-pin, QFN, package that includes exposed bottom pads provides a thermally enhanced solution for space-constrained applications.