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STMicroelectronics L6981

38 V, 1.5 A synchronous step-down converter with low quiescent current

The L6981 is an easy-to-use synchronous monolithic step-down regulator capable of delivering up to 1.5 A DC to the load. The wide input voltage range makes the device suitable for a broad range of applications. The L6981 is based on a peak current mode architecture and is packaged in an SO8 with internal compensation, thus minimizing design complexity and size. The L6981 is available both in low consumption mode (LCM) and low noise mode (LNM) versions. LCM maximizes the efficiency at light-load with controlled output voltage ripple so the device is suitable for battery-powered applications.

Key features

90% typical efficiency at 1.5A load (24V to 5V)
IQ at 3.3V = 17 μA with Low Consumption Mode (LCM) for 3.3V and 5V version
400 kHz fixed frequency
Internal Compensation Network

Additional features

3.5 V to 38 V operating input voltage
Output voltage from 0.85 V to VIN
1.5 A DC output current
Internal compensation network
Two different versions:
- LCM for high efficiency at light-loads
- LNM for noise-sensitive applications
2 μA shutdown current
Internal soft-start
Enable
Overvoltage protection
Output voltage sequencing
Thermal protection
Synchronization to an external clock for LNM devices
SO8 package