36 V 400 mA synchronous step-down switching regulator

The L6984 is a step-down monolithic switching regulator able to deliver up to 400 mA DC. The output voltage adjustability ranges from 0.9 V. The fixed 3.3 V VOUT requires no external resistor divider. The “Low Consumption Mode” (LCM) is designed for applications active during car parking, so it maximizes the efficiency at light load with controlled output voltage ripple. The “Low Noise Mode” (LNM) makes the switching frequency almost constant over the load current range, serving low noise application specification like car audio/sensors. The PGOOD open collector output can implement output voltage sequencing during the power-up phase. The synchronous rectification, designed for high efficiency at medium - heavy load, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing on low-side power element implements an effective constant current protection.

Key Features

  • 400 mA DC output current
  • 4.5 V to 36 V operating input voltage
  • Synchronous rectification
  • Low consumption mode or low noise mode
  • 100 μA IQ at light load (LCM VOUT = 3.3 V)
  • 13 μA IQ-SHTDWN
  • Adjustable fSW (250 kHz - 600 kHz)
  • Output voltage adjustable from 0.9 V
  • No resistor divider required for 3.3 V VOUT
  • VBIAS maximizes efficiency at light load
  • 350 mA valley current limit
  • Constant on-time control scheme
  • PGOOD open collector
  • Thermal shutdown

Resources

Technical Documentation

Product Specifications
Description Version Size
DS9982 DS9982: 36 V, 400 mA synchronous step-down switching regulator 4.0 4 MB

Publications and Collaterals

Flyers
Description Version Size
L6984, L6986 Energy saving synchronous DC-DC converters for industrial 1 MB
Brochures
Description Version Size
Brochure Power management guide 09.2017 3 MB

Tools and Software

Evaluation Tools
Solution Evaluation Tools
eDesignSuite Support & Community


Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L6984ATR DFN10 3X3 Tape And Reel Active 0.813 1000 NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
L6984TR VFDFPN 4X4X1.0 10L PITCH 0.50 Tape And Reel Active 0.844 1000 NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6984ATR ActiveDFN10 3X3 IndustrialEcopack2 0 0
L6984TR ActiveVFDFPN 4X4X1.0 10L PITCH 0.50IndustrialEcopack2
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(**) 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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