TheTPS51397A is a high density synchronous buck converter that operates from 4.5-V to 24-V input voltage, and 0.6-V to 5.5-V output voltage range. It has 17-mΩ and 5.9-mΩ integrated MOSFETs that enable high efficiency up to 10 A. The ULQ™ (Ultra Low Quiescent) feature is extremely beneficial for long battery life in low power operation. The large duty operation greatly improves the load transient performance when input voltage is low. The device employs DCAP3™ mode control that enables low external component count, ease of design, optimization of the power design for cost, size, and efficiency, and provides fast transient response with no external compensation components and an accurate feedback voltage. The control topology supports seamless transition between CCM mode at heavy load conditions and DCM operation at light load conditions. Eco-mode™ allows the TPS51397A to maintain high efficiency at light load and OOA mode makes switching frequency above audible frequency (20 kHz), even there is no loading at output side. The TPS51397A 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.