LTC1909-8

PRODUCTION

LTC1909-8

Wide Operating Range, No R_SENSE^TM Step-Down DC/DC Controller with SMBus Programming

PRODUCTION

Figure 1. High Efficiency Step-Down Converter slide

Figure 1. High Efficiency Step-Down Converter

Not the part you were looking for?

Go to Product Selection Table

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $5.51

Features

SMBus/I²C^™ Programmable Output Voltage: 1.3V to 3.5V
No Sense Resistor Required
2% to 90% Duty Cycle at 200kHz
t_ON(MIN) </= 100ns
True Current Mode Control
Stable with Ceramic C_OUT
Power Good Output Voltage Monitor and 50µs Timer
Wide V_IN Range: 4V to 36V (Abs Max)
Precision Resistor Divider and Reference Provide ±1.35% Output Voltage Accuracy Over Temperature
Adjustable Switching Frequency and Current Limit
Forced Continuous Control Pin
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Available in a 28-Lead SSOP Package

Additional Details

The LTC1909-8 is a synchronous step-down switching regulator controller with a digitally programmable output voltage. The output voltage is selected from one of two 5-bit settings programmed into internal registers via a 2-wire SMBus/I²C interface. The interface features safeguards against invalid output voltages and allows the microprocessor to turn the regulator on and off. Valley current control delivers very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in V_IN and V_OUT.

Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference and can assist secondary winding regulation by disabling discontinuous mode operation when the main output is lightly loaded.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and optional short-circuit shutdown timer.

The LTC1909-8 is available in the 28-lead SSOP package.

Applications

Power Supplies for DSPs, ASICs, FPGAs and CPUs
Voltage Margining

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $5.51

Technical Documents 5

LTC1909-8: Wide Operating Range, No RSENSE Step-Down DC/DC Controller with SMBus Programming Data Sheet 08/24/2007

R384 Reliability Data 03/26/2018

DC475A - Demo Manual 09/24/2009

Design Solutions 10 - Active Voltage Positioning Reduces Output Capacitors 08/21/2007

Design Note 279: Microprocessor Core Supply Voltage Set by I²C Bus without VID Lines 08/21/2021

Design Resources 2

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC1909-8EG#PBF	28-Lead SSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1909-8EG#TRPBF	28-Lead SSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC1909-8EG#PBF
Pin/Package Drawing
28-Lead SSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1909-8EG#TRPBF
Pin/Package Drawing
28-Lead SSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Aug 6, 2022

- 22_0171

Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC1909-8EG#PBF

PRODUCTION

LTC1909-8EG#TRPBF

PRODUCTION

pdf

PCN22_0171_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Aug 6, 2022

- 22_0171

Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC1909-8EG#PBF

PRODUCTION

LTC1909-8EG#TRPBF

PRODUCTION

pdf

PCN22_0171_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Companion Parts 4

Parts	Product Life Cycle	Description
Digital Power System Managers1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit