Summary of L6983 – 38V 3A SYNCHRONOUS STEP-DOWN CONVERTER WITH 17UA QUIESCENT CURRENT
The L6983 is a synchronous monolithic step-down regulator delivering up to 3 A with a 3.5–38 V input range. Available in low consumption (LCM) and low noise (LNM) modes, it features internal compensation, selectable switching frequency (200 kHz–2.2 MHz) with optional spread spectrum, 17 μA quiescent current, 2 μA shutdown, protection features, and a QFN16 3×3 package, simplifying compact, efficient power-supply designs.
Parts used in the L6983 Project:
- L6983 synchronous step-down regulator (QFN16 3×3)
- Input capacitor (low ESR, value per design)
- Output capacitor (low ESR, value per design)
- Inductor rated for 3 A DC
- Feedback resistors for setting output voltage
- Optional fixed 3.3 V or 5 V L6983 version
- Enable / shutdown control signal
- Optional synchronization clock source (for LNM)
- Optional spread spectrum control circuitry
- PCB with thermal management (copper area/thermal vias)
The L6983 is an easy to use synchronous monolithic step-down regulator capable of delivering up to 3 A 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 3×3 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 200 Hz – 2.2 MHz range with optional spread spectrum for improved EMC.
Key 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
- 3 A DC output current
- 17 μA operating quiescent current
- 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
- Overvoltage protection
- Output voltage sequencing
- Thermal protection
- 200 kHz to 2.2 MHz 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
Read more: L6983 – 38V 3A SYNCHRONOUS STEP-DOWN CONVERTER WITH 17UA QUIESCENT CURRENT
- What input voltage range does the L6983 support?
The L6983 supports an operating input voltage from 3.5 V to 38 V. - How much output current can the L6983 deliver?
The device can deliver up to 3 A DC to the load. - Are there different operating modes of the L6983?
Yes, there are LCM (low consumption mode) for high efficiency at light loads and LNM (low noise mode) for noise sensitive applications. - What switching frequency range is available for the L6983?
The switching frequency is programmable from 200 kHz to 2.2 MHz and can be spread spectrum enabled. - What are the quiescent and shutdown currents?
The operating quiescent current is 17 μA and the shutdown current is 2 μA. - Does the L6983 include protection features?
Yes, it includes overvoltage protection, thermal protection, output voltage sequencing, and Power Good indication. - Are fixed output voltage versions available?
Yes, 3.3 V and 5 V fixed output voltage versions are available alongside adjustable outputs down to 0.85 V. - Is the device stable with low ESR capacitors?
Yes, the L6983 is specified as stable with low ESR capacitors. - Does the L6983 support synchronization to an external clock?
Yes, LNM devices support synchronization to an external clock.
