A6985F - Automotive 38 V, 500 mA synchronous step-down switching regulator with 30 µA quiescent current - STMicroelectronics

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Description

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.

All 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 I_Qat light-load (LCM V_OUT = 3.3 V)

8 μA I_Q-SHTDWN

Fixed output voltage (3.3 V and 5 V) or adjustable from 0.85 V to V_IN

Adjustable f_SW (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

R_{DSON HS} = 360 mΩ, R_{DSON LS} = 150 mΩ

Thermal shutdown
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	Resource title	Version	Latest update

SPICE models (3)

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

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Part Number	RoHS Compliance Grade	Grade	Material Declaration**
A6985F	Ecopack2	Automotive	PDF XML
A6985F3V3	Ecopack2	Automotive
A6985F3V3TR	Ecopack2	Automotive
A6985F5V	Ecopack2	Automotive
A6985F5VTR	Ecopack2	Automotive
A6985FTR	Ecopack2	Automotive	PDF XML

A6985F

Package:

Automotive

Material Declaration**:

A6985F3V3

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Automotive

Material Declaration**:

A6985F3V3TR

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Automotive

Material Declaration**:

A6985F5V

Package:

Automotive

Material Declaration**:

A6985F5VTR

Package:

Automotive

Material Declaration**:

A6985FTR

Package:

Automotive

Material Declaration**:

(**) 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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