L6986I - 38 V, 5W synchronous iso-buck converter - STMicroelectronics

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Description

The L6986I is a device specifically designed for the isolated buck topology. Due to the P-Channel MOSFET as high-side power switch the device features 100% duty cycle operation. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The primary sink capability up to 1.9 A (even during soft-start) allows a proper energy transfer to the secondary side as well as enables a tracked soft-start of the secondary output. The control loop is based on a peak current mode architecture and the device operates in forced PWM. The 300 ns blanking time filters oscillations, generated by the transformer leakage inductance, making the solution more robust. Pulse by pulse current sensing on both power elements implements an effective constant current protection in the primary side. Due to the primary reverse current limit, the secondary output is protected against short circuit events. A primary output voltage supervisor, which notifies primary output voltage regulation through the RST open collector output, overvoltage protection, adjustable switching frequency, synchronization and a programmable soft-start are also available.

All features
Designed for iso-buck topology

4 V to 38 V operating input voltage

Primary output voltage regulation / no optocoupler required

1.9 A typical sink peak primary current capability

Peak current mode architecture in forced PWM operation

300 ns blanking time

8 µA I_Q-SHTDWN
Adjustable f_SW and synchronization

Embedded primary output voltage supervisor

Adjustable soft-start time

Internal primary current limiting

Overvoltage protection

R_{DS(on) HS} = 180 mΩ, R_{DS(on) LS} = 150 mΩ

Thermal shutdown
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L6986I and A6986I : 38V, 5W synchronous iso-buck regulators, DC-DC converters

L6986I and A6986I : 38V, 5W synchronous iso-buck regulators, DC-DC converters

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	Resource title	Version	Latest update

Product Specifications (1)

	Resource title	Version	Latest update
PDF	DS13647 38 V, 5 W synchronous iso-buck converter for isolated applications	3.0	20 Jan 2025	20 Jan 2025 DS13647 38 V, 5 W synchronous iso-buck converter for isolated applications 3.0

Application Notes (1)

	Resource title	Version	Latest update
PDF	AN5960 The isobuck-boost topology enhances performances of A/L6986I and A/L6983I	1.0	11 Oct 2024	11 Oct 2024 AN5960 The isobuck-boost topology enhances performances of A/L6986I and A/L6983I 1.0

Technical Notes & Articles (2)

	Resource title	Version	Latest update
PDF	TN1224 Mounting instructions for SMD (surface mounting device) packages	2.4	11 Jul 2023	11 Jul 2023 TN1224 Mounting instructions for SMD (surface mounting device) packages 2.4
PDF	ST Coilcraft L3751	1.0	02 May 2023	02 May 2023 ST Coilcraft L3751 1.0

Presentations (1)

	Resource title	Version	Latest update
PDF	Discover ST’s portfolio for signal conditioning, interface, and power management in wearables	2.2	02 Aug 2023	02 Aug 2023 Discover ST’s portfolio for signal conditioning, interface, and power management in wearables 2.2

Flyers (2)

	Resource title	Version	Latest update
PDF	A6983I and A6986I: isolated DC-DC converters ICs	2.0	05 Mar 2025	05 Mar 2025 A6983I and A6986I: isolated DC-DC converters ICs 2.0
PDF	L6981, L6982, L6983 flyer	1.0	22 Dec 2023	22 Dec 2023 L6981, L6982, L6983 flyer 1.0

Brochures (1)

	Resource title	Version	Latest update
PDF	DC-DC Switching Converters Reference Guide	6.0	30 Jul 2024	30 Jul 2024 DC-DC Switching Converters Reference Guide 6.0

White Papers (1)

	Resource title	Version	Latest update
PDF	How planar magnetics improve performance in power electronics	1.0	11 Nov 2022	11 Nov 2022 How planar magnetics improve performance in power electronics 1.0

EDA Symbols, Footprints and 3D Models

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	Resource title	Version	Latest update

SIMPLIS models (1)

	Resource title	Version	Latest update
ZIP	L6986I SIMPLIS examples schematics	2023.10	25 Jan 2024	25 Jan 2024 L6986I SIMPLIS examples schematics 2023.10

Quality and Reliability

Part Number	Marketing Status	Package	Grade	RoHS Compliance Grade	Material Declaration**
L6986ITR	Active	HTSSOP16	Industrial	Ecopack2	PDF XML

L6986ITR

Package:

HTSSOP16

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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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Operating Temperature (°C) (min)

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0.95 / 10k

Available at 6 distributors

Distributor availability of L6986ITR

Distributor Name	Region	Stock	Min. Order	Third party link
Farnell Element14	EUROPE	7069	1	Buy from Distributor
ANGLIA Live	EUROPE	2520	1	Buy from Distributor
MOUSER	WORLDWIDE	599	1	Buy from Distributor
AVNET	AMERICA	15000	0	Buy from Distributor
DIGIKEY	WORLDWIDE	1834	1	Buy from Distributor
YOSUN	ASIA/PACIFIC	200	1	Buy from Distributor

Distributor reported inventory date: 3/30/2025

HTSSOP16

Tape and Reel

PHILIPPINES

EAR99

NEC

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L6986ITR Active

Budgetary Price (US$)*/Qty:

0.95 / 10k

Available at 6 distributors

Buy Direct at ST

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Package:

HTSSOP16

Packing Type:

Tape and Reel

Country of Origin:

PHILIPPINES

ECCN (US):

EAR99

ECCN (EU):

NEC

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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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