L5985

The L5985 is a step-down switching regulator with a 2.5 A (min.) current limited embedded Power MOSFET, so it is able to deliver up to 2 A DC current to the load depending on the application condition.

The input voltage can range from 2.9 V to 18 V, while the output voltage can be set starting from 0.6 V to V_IN. Having a minimum input voltage of 2.9 V, the device is suitable for a 3.3 V bus.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The VFQFPN8 package with an exposed pad allows reducing the R_thJAdown to approximately60 °C/W.

Key Features

2 A DC output current
2.9 V to 18 V input voltage
Output voltage adjustable from 0.6 V
250 kHz switching frequency, programmable up to 1 MHz
Internal soft-start and inhibit
Low dropout operation: 100% duty cycle
Voltage feedforward
Zero load current operation
Overcurrent and thermal protection
VFQFPN8 3 mm x 3 mm package

Circuit Diagram

Download

Resources

Technical Documentation

Product Specifications

	Description	Version	Size
	DS5038: 2 A step-down switching regulator	6.0	956 KB

Design Notes & Tips

	Description	Version	Size
	DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration	1.1	359 KB

Publications and Collaterals

Brochures

	Description	Version	Size
	Brochure Power management guide	09.2017	3 MB
	Electric vehicle (EV) ecosystem	1.1	1 MB

Tools and Software

Evaluation Tools

Solution Evaluation Tools

Part Number	Manufacturer	Description
EVAL5985		Evaluation board for L5985: 2A step-down switching regulator

SMPS

DC/DC

Input

Volt. Min [V] This option is required. And must be less than or equal to Volt. Max [V]

Volt. Max [V] This option is required. And must be greater than or equal to Volt. Min [V]

Output

Output Power:

Voltage [V] This option is required and must be a number.

Current [A] This option is required and must be a number.

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
L5985TR	DFN8 3x3	Tape And Reel	Active : Product is in volume production	0.978	1000	NEC	EAR99	PHILIPPINES	MORE INFO	Get Sample Add to cart	DISTRIBUTOR AVAILABILITY

(*) 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**
L5985TR	Active	DFN8 3x3	Industrial	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.