Datasheet L6983 (STMicroelectronics)

Описание38 V 3A synchronous step-down converter with 17uA quiescent current
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L6983. Features. Maturity status link. Applications. Description. DS13116. Rev 1. October 2019

Datasheet L6983 STMicroelectronics

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Datasheet 38 V, 3 A synchronous step-down converter with 17 µA quiescent current
• 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 QFN16 (3 x 3 mm) • 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
Maturity status link
• Designed for 24 V buses industrial power systems • 24 V battery powered equipment • Decentralized intelligent nodes • Sensors and always-on applications • Low noise applications
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 3x3 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.
Rev 1
October 2019 For further information contact your local STMicroelectronics sales office. Document Outline 1 Diagram 2 Pin configuration 3 Typical application circuit 4 Absolute maximum ratings 4.1 ESD protection 4.2 Thermal characteristics 5 Electrical characteristics 5.1 Frequency selection table 6 Functional description 6.1 Enable 6.2 Soft-start 6.3 Undervoltage lockout 6.4 Light-load operation 6.4.1 Low consumption mode (LCM) 6.4.2 Low noise mode (LNM) 6.4.3 Efficiency for low consumption mode and low noise mode part number 6.4.4 Load regulation for low consumption mode and Low noise mode part number 6.5 Switch-over feature 6.6 Spread spectrum 6.7 Overvoltage protection 6.8 Overcurrent protection 6.9 Thermal shutdown 6.10 Power Good 7 Closing the loop 7.1 GCO(s) control to output transfer function 7.2 Error amplifier compensation network 7.3 Voltage divider 8 Application notes 8.1 Programmable power up threshold 8.2 External synchronization (available for low noise mode only) 8.3 Output voltage adjustment 8.4 Switching frequency 8.5 Design of the power components 8.5.1 Input capacitor selection 8.5.2 Inductor selection 8.5.3 Output capacitor selection 9 Application board 10 Efficiency curves 11 Thermal dissipation 12 Package information 12.1 QFN16 (3x3 mm) package information 13 Ordering information Revision history