The TPS5683x is an 8A synchronous buck converter operating from 4.5V to 28V input voltage (Vin). The device output voltage ranges from 0.6V to 13V (Vout) and supports 8A continuous output current. The proprietary D-CAP3 control mode enables low external component count, ease of design, optimization of the power design for power, size and efficiency. The device employs D-CAP3 control mode that provides fast transient response with no external compensation components and an accurate feedback voltage. The TPS5683x is able to adapt both low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors.

The TPS56837 operates at Eco-mode to attain high efficiency at light load. The TPS56838 operates in forced continuous conduction mode (FCCM) which maintains lower output ripple during all load conditions. The TPS56836 operates in Out-of Audio mode (OOA) to avoid audible noise.

The TPS5683x has three selectable switching frequencies (Fsw): 500kHz, 800kHz, and 1200kHz. These frequencies give the flexibility to optimize the design for higher efficiency with smaller size. There are two selectable current limits (ILIM-1, ILIM). All of these options are configured by connecting right MODE resistor between MODE and AGND pin.

The EN pin has an internal pullup current that can be used to adjust the input voltage undervoltage lockout (UVLO) with two external resistors. In addition, the EN pin can be floating for the device to operate with the internal pullup current. Soft-start time can be set by connecting a capacitor to the SS pin. Leaving SS pin floating is set to default 1.8ms soft-start time. The TPS5683x has PG pin to indicate output status and has a built in discharge function by using an integrated MOSFET with 200Ω R_DS(on). The device is protected from output short, undervoltage, overvoltage, and overtemperature conditions.