38 V, 3 A synchronous step-down converter with 17 µA quiescent current

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Product overview

Description

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 kHz - 2.3 MHz range with optional spread spectrum for improved EMC.

The EN pin provides enable/disable function. The typical shutdown current is 2 µA when disabled. As soon as the EN pin is pulled up, the device is enabled and the internal 1.3 ms 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.

  • All 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 2.3 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

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STMicroelectronics - L6983

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6983C33QTR
Active
QFPN 3X3X0.80 16L PITCH 0.50 Industrial Ecopack3
L6983C50QTR
Active
QFPN 3X3X0.80 16L PITCH 0.50 Industrial Ecopack3
L6983CQTR
Active
QFPN 3X3X0.80 16L PITCH 0.50 Industrial Ecopack3
L6983N33QTR
Active
QFPN 3X3X0.80 16L PITCH 0.50 Industrial Ecopack3
L6983N50QTR
Active
QFPN 3X3X0.80 16L PITCH 0.50 Industrial Ecopack3
L6983NQTR
Active
QFPN 3X3X0.80 16L PITCH 0.50 Industrial Ecopack3

L6983C33QTR

Package:

QFPN 3X3X0.80 16L PITCH 0.50

Material Declaration**:

Marketing Status

Active

Package

QFPN 3X3X0.80 16L PITCH 0.50

Grade

Industrial

RoHS Compliance Grade

Ecopack3

L6983C50QTR

Package:

QFPN 3X3X0.80 16L PITCH 0.50

Material Declaration**:

PDF XML

Marketing Status

Active

Package

QFPN 3X3X0.80 16L PITCH 0.50

Grade

Industrial

RoHS Compliance Grade

Ecopack3

L6983CQTR

Package:

QFPN 3X3X0.80 16L PITCH 0.50

Material Declaration**:

Marketing Status

Active

Package

QFPN 3X3X0.80 16L PITCH 0.50

Grade

Industrial

RoHS Compliance Grade

Ecopack3

L6983N33QTR

Package:

QFPN 3X3X0.80 16L PITCH 0.50

Material Declaration**:

Marketing Status

Active

Package

QFPN 3X3X0.80 16L PITCH 0.50

Grade

Industrial

RoHS Compliance Grade

Ecopack3

L6983N50QTR

Package:

QFPN 3X3X0.80 16L PITCH 0.50

Material Declaration**:

Marketing Status

Active

Package

QFPN 3X3X0.80 16L PITCH 0.50

Grade

Industrial

RoHS Compliance Grade

Ecopack3

L6983NQTR

Package:

QFPN 3X3X0.80 16L PITCH 0.50

Material Declaration**:

PDF XML

Marketing Status

Active

Package

QFPN 3X3X0.80 16L PITCH 0.50

Grade

Industrial

RoHS Compliance Grade

Ecopack3

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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