Description
The STEVAL-L6981NDR is based on the L6981NDR synchronous monolithic stepdown regulator delivering up to 1.5 A DC. Its wide input voltage range makes the solution suitable for a broad range of applications. The device implements peak current mode architecture in a SO 8L package with internal compensation to minimize design complexity and size. The L6981 is available in low consumption mode (LCM) and low noise mode (LNM) versions. LCM maximizes efficiency at light-load with controlled output voltage ripple, making the device extremely suitable for battery-powered applications. LNM makes the switching frequency constant and minimizes the output voltage ripple overload current range, meeting the specification for noise sensitive applications. The EN pin manages the enable/disable function. The typical shutdown current is 2 μA when disabled. When the EN pin is pulled up, the device is enabled and the internal 1.3 ms soft-start takes place. Pulse-by-pulse current sensing on both power elements implements effective constant current protection while thermal shutdown prevents thermal run-away. Product summary 38 V, 1.5 A synchronous stepdown switching regulator evaluation board based on the L6981NDR STEVALL6981NDR 38 V, 1.5 A synchronous stepdown converter with low quiescent current L6981NDR

Features
■ 3.5 V to 38 V operating input voltage
■ Output voltage from 0.85 V to VIN
■ 3.3 V and 5 V fixed output voltage versions
■ 1.5 A DC output current
■ 17 μA operating quiescent current (fixed Vout part numbers)
■ Internal compensation network
■ Two different versions: LCM for high efficiency at light loads and LNM for noise sensitive applications
■ 2 μA shutdown current
■ Internal soft-start
■ Enable function
■ Overvoltage protection
■ Output voltage sequencing