The TPSM843320 device is a 3-A, high-performance, synchronous buck converter module with integrated inductor and discretes. The TPSM843320 has a maximum operating junction temperature of 125°C, making the device an excellent choice for high-ambient temperature applications such as wireless infrastructure. The input voltage range is 4 V to 18 V and the output voltage range is 0.5 V to 5.5 V. The device features a fixed-frequency Advanced Current Mode control with a switching frequency of 500 kHz to 2.2 MHz, allowing for efficiency and size optimization when selecting output filter components. The switching frequency of the device can be synchronized to an external clock applied to the SYNC pin.

Advanced Current Mode (ACM) is an emulated peak current control topology. Advanced Current Mode supports stable static and transient operation without complex external compensation design. This control architecture includes an internal ramp generation network that emulates inductor current information, enabling the use of low-ESR output capacitors such as multi-layered ceramic capacitors (MLCC). The internal ramp also creates a high signal-to-noise ratio for good noise immunity. The TPSM843320 has three ramp options (see Section 6.3.6 for details) to optimize the internal loop for various inductor and output capacitor combinations with only a single resistor to AGND. The TPSM843320 is easy-to-use and allows low external component count with fast load transient response. Fixed-frequency operation also provides ease-of-filter design to overcome EMI noise.