LTC1909-8

PRODUCTION

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

Part Models: 2
1ku List Price: Starting From $5.51

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Overview

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

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

Part Models: 2
1ku List Price: Starting From $5.51

Documentation

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	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1909-8EG#TRPBF	28-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG
		PCN22_0171_Form Material_Report Delta Qualification Matrix
LTC1909-8EG#PBF	PRODUCTION
LTC1909-8EG#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

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