The TPS568215 is a high-density, synchronous, step-down buck converter which can operate from 4.5-V to 17-V input voltage (V_IN). The device has 19-mΩ and 9-mΩ integrated MOSFETs that enable high efficiency up to 8 A. The device employs D-CAP3? control mode that provides fast transient response with no external compensation components and an accurate feedback voltage. The control topology provides seamless transition between FCCM operating mode at higher load condition and DCM/Eco-mode? operation at lighter load condition. DCM/Eco-mode? allows the TPS568215 to maintain high efficiency at light load. The TPS568215 is able to adapt to both low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors.

The TPS568215 has three selectable switching frequencies (F_SW) 400 kHz, 800 kHz, and 1200 kHz which gives the flexibility to optimize the design for higher efficiency or smaller size. There are two selectable current limits. All these options are configured by choosing the right voltage on the MODE pin.

The TPS568215 has a 4.7-V internal LDO that creates bias for all internal circuitry. There is a feature to overdrive this internal LDO with an external voltage on the VREG5 pin which improves the converter efficiency. The undervoltage lockout (UVLO) circuit monitors the VREG5 pin voltage to protect the internal circuitry from low input voltages. The device has an internal pullup current source on the EN pin which can enable the device even with the pin floating.

Soft-start time can be selected by connecting a capacitor to the SS pin. The device is protected from output short, undervoltage, and overtemperature conditions.