L6985F

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38 V, 500 mA synchronous step-down switching regulator with 30 µA quiescent current

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Product overview

Description

The L6985F is a step-down monolithic switching regulator able to deliver up to 0.5 A DC. The output voltage adjustability ranges from 0.85V to VIN. Thanks to the P-channel MOSFET high-side power element, the device features 100% of the duty cycle operation. The wide input voltage range meets the specification for the 5 V, 12 V and 24 V power supplies. The “Low Consumption Mode” (LCM) is designed for applications active during the idle mode, so it maximizes the efficiency at the light-load with the controlled output voltage ripple. The “Low Noise Mode” (LNM) makes the switching frequency constant overload current range, meeting the low noise application specification. 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 the 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 effective constant current protection.

  • All features

    • 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 μAIQ-SHTDWN
    • Output voltage 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
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SPICE models (3)

Resource title
Version
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A6985F Pspice model
1.0 31 Mar 2023
31 Mar 2023
A6985F Pspice model 1.0
A6985F3V3 Spice model
30 Sep 2016
30 Sep 2016
A6985F3V3 Spice model
A6985F5V Spice model
30 Sep 2016
30 Sep 2016
A6985F5V Spice model

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6985F
Active
HTSSOP16 Industrial Ecopack2
L6985FTR
Active
HTSSOP16 Industrial Ecopack2

L6985F

Package:

HTSSOP16

Material Declaration**:

More Info

Marketing Status

Active

Package

HTSSOP16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L6985FTR

Package:

HTSSOP16

Material Declaration**:

More Info

Marketing Status

Active

Package

HTSSOP16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors

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