STMicroelectronics L7983

The L7983 device is a step-down monolithic switching regulator able to deliver up to 300 mA DC based on peak current mode architecture. The output voltage adjustability ranges from 0.85 V to VIN. The wide input voltage range and adjustable UVLO threshold meet the specification for the 12 V, 24 V, and 48 V industrial bus standards.

The "Low Consumption Mode" (LCM) is designed for applications active during idle mode, so it maximizes the efficiency at light load with a controlled output voltage ripple. The "Low Noise Mode" (LNM) makes the switching frequency constant, meeting the low noise application specification.

Key features

• 3.5 V to 60 V operating input voltage
• Fixed output voltage (3.3 V and 5 V) or adjustable from 0.85 V to VIN
• 300 mA DC output current
• Dynamic low consumption mode to low noise mode selection

Additional features

• 3.5 V to 60 V operating input voltage
• Fixed output voltage (3.3 V and 5 V) or adjustable from 0.85 V to V_IN
• 300 mA DC output current
• Dynamic Low Consumption Mode (LCM) to Low Noise Mode (LNM) selection
• 10 µA operating quiescent current (L7983PU33R, VIN > 24 V, LCM)
• 2.3 µA shutdown current
• 200 kHz to 2.2 MHz programmable switching frequency
• Optional spread-spectrum (dithering)
• Internal soft-start
• Enable/adjustable UVLO threshold
• Synchronization to an external clock
• Internal compensation network
• Internal current limiting
• Overvoltage protection
• Output voltage sequencing
• Thermal shutdown

Applications

• Designed for 12 V, 24 V and 48 V buses
• Battery powered applications
• Decentralized intelligent nodes
• Fail-safe systems
• Sensors and low noise applications (LNM)

Available tools

STEVAL-L7983ADJ:

12 V/0.3 A step-down DC/DC converter (VIN = 12 to 60 V) based on the L7983PUR regulator

STEVAL-L7983V33:

3.3 V/0.3 A step-down DC/DC converter (VIN = 3.5 V to 60 V) based on the L7983PU33R

STEVAL-L7983V50:

5.0 V/0.3 A step-down DC/DC converter (VIN = 5 to 60 V) based on the L7983PU50R regulator