The TPS56424x is a 4-A integrated FET and BST pin synchronous step-down buck converter that operates from 3-V to 16-V input voltage (VIN) and 0.6-V to 7-V output voltage. This device also integrates the BST pin in an internal IC and adds one AGND pin. The device employs D-CAP3 topology that provides fast transient response with no external compensation components and an accurate feedback voltage. The proprietary D-CAP3 mode enables low external component count, ease of design, and optimization of the power design for cost, size, and efficiency. The topology provides a seamless transition between CCM operating mode at higher load condition and DCM operation at lighter load condition.
The Eco-mode version allows the TPS564242 to maintain high efficiency at light load. The FCCM version allows the TPS564247 to maintain a fixed switching frequency and lower output voltage ripple. The TPS56424x 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.