ST – L6983Q – 38V, 3A synchronous buck converter with 17μA quiescent current
The L6983 is an easy to use synchronous monolithic step-down regulator capable of delivering up to 3A DC to the load. The wide input voltage range makes the device suitable for a broad range of applications. The L6983 is based on a peak current mode architecture and is packaged in a QFN16 3x3mm with internal compensation thus minimizing design complexity and size.
The L6983 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. LNM makes the switching frequency constant and minimizes the output voltage ripple for light load operations, meeting the specification for low noise sensitive applications. The L6983 allows the switching frequency to be selected in the 200kHz – 2.2MHz range with optional spread spectrum for improved EMC.
The EN pin provides enable/disable function. The typical shutdown current is 2µA when disabled. As soon as the EN pin is pulled up, the device is enabled and the internal 1.3ms soft-start takes place. The L6983 features Power Good open collector that monitors the FB voltage. Pulse-by-pulse current sensing on both power elements implements an effective constant current protection and thermal shutdown prevents thermal run-away.
Features
- 3.5V to 38V operating input voltage
- Output voltage from 0.85V to VIN
- 3.3V and 5V fixed output voltage versions
- 3A DC output current
- 17μA operating quiescent current
- Internal compensation network
- Two different versions:
- LCM for high efficiency at light loads and LNM for noise sensitive applications
- 2μA shutdown current
- Internal soft-start
- Enable
- Overvoltage protection
- Output voltage sequencing
- Thermal protection
- 200kHz to 2.2MHz programmable switching frequency. Stable with low ESR capacitor
- Optional spread spectrum for improved EMC
- Power Good
- Synchronization to external clock for LNM devices
- QFN16 package
Applications
- Designed for 24V buses industrial power systems
- 24V battery powered equipment
- Decentralized intelligent nodes
- Sensors and always-on applications
- Low noise applications
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