7.1 Overview

The TPSM84624 is a full-featured 4.5-V to 17-V input, 6-A, synchronous step-down converter with PWM, MOSFETs, inductor, and control circuitry integrated into a low-profile package. The device integration enables small designs, while still leaving the ability to adjust key parameters to meet specific design requirements. The TPSM84624 provides an output voltage range of 0.6 V to 10 V. An external resistor divider is used to adjust the output voltage to the desired output. The switching frequency is also adjustable by using an external resistor or a synchronization clock to accommodate various input and output voltage conditions and to optimize efficiency.

The TPSM84624 includes the TurboTrans feature which optimizes the transient response of the converter while simultaneously reducing the quantity of external output capacitors required to meet a target voltage deviation specification.

The TPSM84624 has been designed for safe start-up into pre-biased loads. The default start-up is when V_IN is typically 4.1 V. The EN pin has an internal pullup current source that can be used to adjust the input voltage undervoltage lockout (UVLO) with two external resistors. In addition, the internal pullup current of the EN pin allows the device to operate with the EN pin floating. The EN pin can also be pulled low to put the device in standby mode to reduce input quiescent current. The device provides a power-good (PGOOD) signal to indicate when the output voltage is within regulation. Thermal shutdown and current limit features protect the device during an overload condition. A 24-pin QFM package that includes exposed bottom pads provides a thermally enhanced solution for space-constrained applications.