38 V 0.5 A synchronous step-down switching regulator with 30 uA quiescent current

The A6985F automotive grade device is a step-down monolithic switching regulator able to deliver up to 0.5 A DC. The output voltage adjustability ranges from 0.85 V to VIN. The 100% duty cycle capability and the wide input voltage range meet the cold crank and load dump specifications for automotive systems. 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 constant and minimizes the output voltage ripple overload current range, meeting the low noise application specification like car audio. The output voltage supervisor manages the reset phase for any digital load (μC, FPGA). The RST open collector output can also 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 both power elements implements an effective constant current protection.

Key Features

  • AEC-Q100 qualified
  • 0.5 A DC output current
  • 4 V to 38 V operating input voltage
  • Low consumption mode or low noise mode
  • 30 μA IQ at light-load (LCM VOUT = 3.3 V)
  • 8 μA IQ-SHTDWN
  • Fixed output voltage (3.3 V and 5 V) or adjustable from 0.85 V to VIN
  • Adjustable fSW (250 kHz - 2 MHz)
  • Embedded output voltage supervisor
  • Synchronization
  • Adjustable soft-start time
  • Internal current limiting
  • Overvoltage protection
  • Output voltage sequencing
  • Peak current mode architecture
  • RDSON HS = 360 mΩ, RDSON LS = 150 mΩ
  • Thermal shutdown

Resources

Technical Documentation

Product Specifications
Description Version Size
Automotive 38 V, 500 mA synchronous step-down switching regulator with 30 μA quiescent current 6.0 1 MB

HW Model, CAD Libraries & SVD

HW Model, CAD Libraries & SVD
Description Version Size
A6985F Pspice model 270 KB
A6985F3V3 Spice model 268 KB
A6985F5V Spice model 267 KB

Publications and Collaterals

Flyers
Description Version Size
A698x family High-performance automotive synchronous DC-DC converters 1.0 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
A6985F3V3TR HTSSOP16 Tape And Reel Active 1.5 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
A6985FTR HTSSOP16 Tape And Reel Active 1.5 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
A6985F HTSSOP16 Tube Active 1.5 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
A6985F5VTR HTSSOP16 Tape And Reel Active 1.5 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
A6985F3V3 HTSSOP16 Tube Active 1.5 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
A6985F5V HTSSOP16 Tube Active 1.5 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
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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**
A6985F3V3TR ActiveHTSSOP16AutomotiveEcopack1
A6985FTR ActiveHTSSOP16AutomotiveEcopack1
A6985F ActiveHTSSOP16AutomotiveEcopack1
A6985F5VTR ActiveHTSSOP16AutomotiveEcopack1 (*)
A6985F3V3 ActiveHTSSOP16AutomotiveEcopack1
A6985F5V ActiveHTSSOP16AutomotiveEcopack1 (*)
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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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