ST1S10

The ST1S10 is a high efficiency step-down PWM current mode switching regulator capable of providing up to 3 A of output current. The device operates with an input supply range from 2.5 V to 18 V and provides an adjustable output voltage from 0.8 V (V_FB) to 0.85 * V_{IN_SW}[V_OUT= V_FB* (1 + R1/R2)]. It operates either at a 900 kHz fixed frequency or can be synchronized to an external clock (from 400 kHz to 1.2 MHz). The high switching frequency allows the use of tiny SMD external components, while the integrated synchronous rectifier eliminates the need for a Schottky diode. The ST1S10 provides excellent transient response, and is fully protected against thermal overheating, switching overcurrent and output short-circuit.

The ST1S10 is the ideal choice for point of load regulators or LDO pre-regulation.

Key Features

Step-down current mode PWM regulator
Output voltage adjustable from 0.8 V
Input voltage from 2.5 V up to 18 V
2% DC output voltage tolerance
Synchronous rectification
Inhibit function
Synchronizable switching frequency from 400 kHz up to 1.2 MHz
Internal soft start
Dynamic short-circuit protection
Typical efficiency: 90%
3 A output current capability
Standby supply current: max. 6 μA over temperature range
Operative junction temp.: from -40 °C to 125 °C

Circuit Diagram

Download

Resources

Technical Documentation

Product Specifications

	Description	Version	Size
	DS5438: 3 A, 900 kHz, monolithic synchronous step-down regulator IC	6.0	768 KB

Application Notes

	Description	Version	Size
	AN2620: 3 A high-frequency synchronous 900 kHz step-down converter based on the ST1S10	3.1	1 MB
	AN2754: Buck high-brightness LED driver based on the ST1S10 step-down DC-DC converter voltage regulator	1.0	302 KB

Publications and Collaterals

Brochures

	Description	Version	Size
	Brochure Power management guide	10.2018	4 MB
	Electric vehicle (EV) ecosystem	1.1	1 MB

Tools and Software

Evaluation Tools

Solution Evaluation Tools

Part Number	Manufacturer	Description
STEVAL-ISA044V5		3 A synchronous 900 kHz step-down DC-DC converter with inhibit function based on the ST1S10 (Power SO-8)
STEVAL-ISA044V6		3 A synchronous 900 kHz step-down DC-DC converter with inhibit function based on the ST1S10 (DFN)

Converter

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 (US)	Country of Origin	More info	Order from ST	Order from Distributors
ST1S10PHR	PowerSO-8	Tape And Reel	Active : Product is in volume production	0.693	1000	EAR99	CHINA	MORE INFO	Free Sample Add to cart	DISTRIBUTOR AVAILABILITY
ST1S10PUR	DFN8 4x4	Tape And Reel	Active : Product is in volume production	0.693	1000	EAR99	MALAYSIA	MORE INFO	Free 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**
ST1S10PHR	Active	PowerSO-8	Industrial	Ecopack2
ST1S10PUR	Active	DFN8 4x4	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.